Current Projects
Sponsor: USDA-NIFA
Award Dates: 7/1/2017 - 6/30/2022
Participants
Project Lead: Graham, Wendy Dimbero
Project Participants: Adams, Damian; Athearn, Kevin R; Barrett, Charles Edward; Bartels, Wendy Lin; Borisova, Tatiana; Dukes, Michael D; Galindo, Sebastian; Hochmuth, Robert Conway; Kaplan, David A; Monroe,; Martha Carrie; Troy, Patrick A.
Goals and Objectives
The goal of the FACETS project is to ensure economic sustainability of agriculture and silviculture in N Florida and S Georgia while protecting water quantity, quality, and habitat in the UFA and the springs and rivers it feeds. We will achieve this goal by accomplishing the following objectives:
1) Build a comprehensive modeling platform to predict farm/forest- and regional-scale impacts of alternative land use and production practices on the water quantity, water quality, and economy of North Florida and South Georgia.
2) Engage stakeholders to work together to explore economic-environmental tradeoffs among alternative climate, land use, technology, agricultural Best Management Practices, and policy scenarios to understand changes needed to achieve agricultural water security and environmental protection.
3) Conduct innovative agricultural Best Management Practice (BMP) research and demonstration projects. Develop and deliver digital decision toolkits and training programs for diverse stakeholders to bring about preferred changes in agricultural production systems and incentive programs.
Faculty members from the University of Florida, University of Georgia, Albany State University and Auburn University are participating in the Floridan Aquifer Collaborative Engagement for Sustainability (FACETS) project which is recognized by USDA NIFA as a Regional Center of Excellence.
Available Outputs
Title: FACETS Project Website
Photo by Jason Gulley
Sponsor: National Science Foundation
Award Dates: 2019- 2023
Participants
Project Lead: Jonathan Martin (University of Florida)
Project Participants: Wendy Graham, Paloma Carton de Grammont (University of Florida), Pamela Sullivan (University of Kansas), Matt Covington (University of Arkansas), Laura Toran (Temple University), Jennnifer Macalady (Pennsylvania State University), James Heffernan (Duke University).
Goals and Objectives
The Earth’s Critical Zone, defined as the region from the tops of the trees to the bottom of the groundwater, provides life-sustaining resources including food production, water quality, and other ecosystem services. Over the last decade the National Science Foundation funded Critical Zone Observatory (CZO) network has transformed our understanding of how critical zone (CZ) processes regulate the production of these services. However, none of the CZOs within the network occur in landscapes underlain by carbonate bedrock (which cover about a quarter of Earth’s land surface), limiting the development of a holistic understanding of CZ processes.
This project creates a Carbonate Critical Zone Research Coordination network (RCN) that aims to integrate transdisciplinary investigators studying disparate carbonate-rich CZ’s and foster collaboration among these investigators and existing CZO network participants. To do so the project will:
(1) Compile available data and models stemming from current research to identify critical knowledge gaps and develop forward-looking research questions and testable hypotheses.
(2) Convene workshops, in the field and at major disciplinary conferences. Three field workshops will occur in distinct carbonate regions that cross gradients of rock age, climate, and tectonism and will integrate across disciplinary boundaries. Two conference workshops will focus on specific disciplines associated with the particular conference (e.g., geological, hydrological, ecological) and will include special sessions and roundtable discussions across multiple carbonate CZs.
(3) Build capacity in state of the art techniques used to study carbonate CZs within the broad CZ scientific community.
(4) Use data compilation, workshop participation, and training to advance understanding of properties and processes across all CZs.
Outcomes of this RCN will include improved understanding of how relative amounts of carbonate and silicate minerals may cause different CZ properties and processes between regions. Human capital will be developed through research collaborations created during workshops and through training. Participants will be recruited to project activities with a focus on diverse disciplinary expertise, research geographical area, career stage, and demographics. A special effort will be made to increase diversity of participants via members of the steering committee who have interests in expanding inclusivity and by outreach to sections of various major societies aimed at increasing inclusivity along with various smaller societies with primary missions of fostering diversity in STEM fields. Outcomes will be disseminated among the CZ research community through workshop reports, a series of three peer-reviewed papers, and the project website.
photo by Jennifer Adler
Sponsor: Carl S. Swisher Foundation and St Johns River Water Management District
Award Dates: 3/2014- 12/2018
Participants
Project Lead: Graham, Wendy Dimbero
Project Participants: de Rooij, Rob; Henson, Wesley
Goals and Objectives
This research aims to:
- Develop a new methodology to generate stochastic ensembles of possible karst conduit networks that honor the topography, geology, hydrology and climate of the system under study.
- Simulate flow and solute transport within evolved karst aquifers over ensembles of conduit networks and determine factors leading to greatest prediction uncertainty.
- Determine whether the contributions of conduit flow processes to water and solute delivery to springs can be captured using “effective” statistical conduit properties, or whether actual spatial configurations of the conduit system are important.
- Determine the relative importance of local-scale conduit/porous media properties versus large-scale springshed boundary/confinement characteristics for predicting locations of highest risk for contamination of the spring vent from surface activities.
- Apply the model to the Silver Springshed in Central Florida
Available Outputs
Title: From rainfall to spring discharge: Coupling conduit flow, subsurface matrix flow and surface flow in karst systems with a discrete-continuum model
Authors: de Rooij, R., P. Perrochet, and W. Graham
Title: Generation of complex karstic conduit networks with a hydro-chemical model
Authors: de Rooij, R., and W. Graham
Title: What makes a First-magnitude Spring? – Global sensitivity analysis of a speleogenesis model to gain insight into karst network and spring genesis
Authors: Henson, W., R. de Rooij, and W. Graham
Title: Final Report to SJRWMD
Authors: Henson, W., R. de Rooij, and W. Graham
Sponsor: South Florida Water Management District (SFWMD)
Award Dates: February – December 2019
Participants
Project Lead:Wendy Graham
Project Participants: Mark Brenner, Lisette Staal (University of Florida), Jim Fourqurean, Jayantha Obeysekera, (Florida International University),
Goals and Objectives
The south Florida regional landscape has been engineered to provide flood protection and water supply. Lake Okeechobee is the main location for surface water storage in this system. As part of the Central and Southern Florida (C&SF) Project authorized in 1948 the system was engineered with two large canals that now have the capacity to carry large volumes of water from Lake Okeechobee to the St. Lucie and the Caloosahatchee estuaries. Considerable impacts to the natural ecosystems of south Florida, including the St. Lucie Estuary, Caloosahatchee Estuary, Lake Okeechobee, and the Florida Everglades stem from large deviations in the quantity and quality of freshwater delivered to these systems relative to a pre-engineered time period. Lake Okeechobee is regulated and managed by the U.S. Army Corps of Engineers (USACE) in collaboration with SFWMD who provides information. Currently, they are planning a lake regulation review that will consider alternative regulation schedules that take into consideration the tradeoffs between health of the lake, estuaries, Everglades, as well as provision of flood control and water supply.
This project aims to to conduct an independent scientific review to help inform the development of the next Lake Okeechobee Regulation Schedule. To do so, the Water Institute convened an interdisciplinary academic review team that will:
- Acquire and synthesize existing scientific information related to the impacts of the Lake Okeechobee regulation schedule on the ecology of Lake Okeechobee and the estuaries that receive lake discharges;
- Identify knowledge gaps and additional data needed to assess the ecological impacts and tradeoffs of proposed changes to LORS; and
- Develop recommendations and priorities for new efforts needed to fill gaps in existing knowledge
Available Outputs
Title: Scientific Synthesis to Inform Development of the New Lake Okeechobee System Operating Manual
Authors: Graham, W. D., M. Brenner, J. Fourqurean, C. Jacoby, and J. Obeysekera
Sponsor: Tampa Bay Water
Award Dates: 4/2017 - 10/2021
Participants
Project Lead: Graham, Wendy Dimbero
Project Participants: Reisinger, AJ; Chang, Seungwoo (Jason);Hwang, Syewoon;
Goals and Objectives
The aim of this project is to characterize the value, uncertainties and risks associated with the use of multi-decadal climate forecasts and predictions for water resource planning in South West Florida. South West Florida, which includes the heavily populated Tampa Bay area, arguably has the most intense competition for water resources among urban, agricultural and ecological users, as well as significant vulnerability to floods, droughts, and and long-term climate change. The major water resource decision makers in this area are Tampa Bay Water, the largest public water supplier in the region, and the South West Florida Water Management District, which has the responsibility of issuing permits to local and regional governments, agriculture, and other users of surface and aquifer water sources. In this research we will develop and implement a prototype modeling system that provides multi-decadal climate forecasts and predictions for use in Tampa Bay Water's water resource decision making processes. A variety of dynamical and statistical Global Climate Model (GCM) downscaling techniques will be developed and evaluated for the Tampa Bay Region. The most successful techniques will be used to drive Tampa Bay Water's Integrated Hydrologic Model to determine potential impacts of multi-decadal climate varaibility and climate change on water supply reliability in the region.
Available Outputs
Title: Quantitative Spatiotemporal evaluation of dynamically downscaled MM5 precipitation predictions over the Tampa Bay region, Florida, J. Hydrometeor, 12, 1447–1464. doi: http://dx.doi.org/10.1175/2011JHM1309.1, 2011.
Authors: Hwang, S., W. Graham, J. Hernandez, C. Martinez, J. Jones and A. Adams
Title:Assessment of the utility of dynamically-downscaled regional reanalysis data to predict streamflow in west central Florida using an integrated hydrologic model, Regional Environmental Change, doi: 10.1007/s10113-013-0406-x, 2013.
Authors: Hwang, S., W. Graham, A. Adams, and J. Guerink
Title: Development and comparative evaluation of a stochastic analog method to downscale daily GCM precipitation, Hydrol. Earth Syst. Sci., 17, 4481-4502, doi:10.5194/hess-17-4481-2013, 2013.
Authors: Hwang, S., and W. Graham,
Title: Hydrologic implications of errors in bias-corrected regional reanalysis data for west-central Florida, Journal of Hydrology, 510:513–529, http://dx.doi.org/10.1016/j.jhydrol.2013.11.042, 2014.
Authors: Hwang, S., W. Graham, J. Guerink, and A. Adams
Title: Assessment of alternative methods for statistically downscaling daily GCM precipitation outputs to simulate regional streamflow, Journal of the American Water Resources Association, doi:10.1111/jawr.12154, 50(4), 1010-1032, 2014.
Authors: Hwang, S., and W. Graham
Title: Sensitivity of future continental United States water deficit projections to general circulation models, the evapotranspiration estimation method, and the greenhouse gas emission scenario. Hydrol. Earth Syst. Sci., 20, 3245–3261, 2016.
Authors: Chang S., W. Graham, S. Hwang, and R. Munoz-Carpena
Title: Implications of Climate Change on Florida’s Water Resources: Florida's Climate: Changes, Variations, & Impacts
Authors: J Obeysekera, W Graham, MC Sukop, T Asefa, D Wang, and K Ghebremichael
Title: Evaluation of impacts of future climate change and water use scenarios on regional hydrology, Hydrology and Earth System Sciences, 22, 4793-4813, 2018.
Authors: Chang, S. J., W. Graham, J. Geurink, N. Wanakule, and T. Asefa
Title: Instructions and data to produce Bias-Corrected Stochastic Analog (BCSA) downscaled climate variables for watersheds in the Southeast U.S.
Authors: Chang, S. J., W. Graham, S. Hwang
Title: The Florida Water and Climate Alliance (FloridaWCA): Developing a stakeholder-scientist partnership to create actionable science in climate adaptation and water resource management, Bull. Amer. Meteor. Soc. 1–38, 2020.
Authors: Misra, V., T. Irani, L. Staal, K. Morris, T. Asefa, C. Martinez and W. Graham
Sponsors: National Oceanographic and Atmospheric Administration, Tampa Bay Water, Peace River Manasota Regional Water Supply Authority, St Johns River Water Management District
Award Dates: 2011-2018
Participants
Project Leads: Graham, Wendy; Staal, Lisette
Partners: FloridaWCA collaborators include six major public water supply utilities, three water management districts in Florida, local government representatives and several academic organizations including the UF Water Institute, Florida State University COAPS, the Florida Climate Institute (FCI) and UF/IFAS Center for Public Issues Education.
Goals and Objectives
Climate change, climate variability, sea level rise and associated uncertainties and risks pose complex challenges to the planning and operations of Florida’s public water supply utilities. The Florida Water and Climate Alliance (FloridaWCA) is a stakeholder-scientist partnership committed to increasing the relevance of climate science data and tools at relevant time and space scales to support decision-making in water resource management, planning and supply operations in Florida.
The FloridaWCA collaborative Learning network is engaged in co-exploration and co-development of actionable climate science. FloridaWCA Projects contribute to assessing and developing relevant climate data and tools and ensuring their usefulness to water supply and resource planning. According to FloridaWCA utility stakeholders the most important drivers that they currently face relative to climate change and variability are related to a) changes in precipitation, temperature and evapotranspiration patterns/extreme events and b) sea level rise.
For more details and project outputs see the FloridaWCA website
Sponsor: North Carolina State University
Award Dates: 10/2017 - 9/2020
Participants
Project Lead: Graham, Wendy Dimbero
Goals and Objectives
The Department of the Interior Southeast Climate Adaptation Science Center (SE CASC) is part of a federal network of eight Climate Adaptation Science Centers (CASCs) managed by the U.S. Geological Survey National Climate Adaptation Science Center (NCASC). The mission of NCASC and regional CASCs is to work with natural and cultural resource managers to gather the scientific information and build the tools needed to help fish, wildlife, and ecosystems adapt to the impacts of changing climate and land use. The CASCs and NCASC focus on the delivery of science, data, and decision-support tools that are practical and relevant to resource management.
North Carolina State University acts as the host institution for the Southeast Climate Adaptation Science Center, providing organizational support to implement the CASC mission through capacity building, project management, communications, partnership development, and connections with scientific capabilities in the region. The mission is implemented through collaborative partnerships among USGS, natural resource management organizations, and academic institutions.
NC State is the lead university for a consortium of academic institutions across the Southeast, bringing together a breadth of expertise and capacity in natural, physical, and social sciences and management of natural and cultural resources.
SE CASC Consortium Universities (and PIs):
- Auburn University (Karen McNeal)
- Duke University (Lydia Olander)
- University of Florida (Wendy Graham)
- University of South Carolina (Kirstin Dow)
- University of Tennessee (Paul Armsworth)
Available Outputs
Completed Projects
Sponsor: Florida Legislature
Award Dates: 9/2014 - 3/2015
Participants
Project Lead: Graham, Wendy Dimbero
Project Participants: Angelo, Mary Jane; Frazer, Tom; Frederick, Peter; Havens, Karl; Reddy, Ramesh
Goals and Objectives
In 2013, after a particularly wet season in the region and large regulatory discharges to the estuaries, concerns arose about the timing of completing CERP, especially about the timing of construction and completion of projects that would reduce damaging estuary releases and increase the flow of clean water south to the Everglades. Stakeholders have questioned whether there are more immediate solutions especially to the problem of high discharges of poor quality freshwater to the estuaries. In response to the recommendations of the Florida Senate Select Committee on Indian River Lagoon and Lake Okeechobee Basin, The Florida Senate request the UF Water Institute to conduct an independent review of agency-adopted and other proposed plans to move even more water to the Everglades to: (1) ensure that existing evaluations of plans by the agencies are technically sound; and (2) possibly identify innovative, new approaches that have not previously been considered.
Available Outputs
Title: Options to Reduce High Volume Freshwater Flows to the St. Lucie and Caloosahatchee Estuaries and Move Moer Water from Lake Okeechobee to the Southern Everglades: An Independent Technical Review by the University of Florida Water Institute
Authors: Graham W. , Angelo M. J. , Frazer T. , Frederick P., Havens K., and R. Reddy.
Sponsor: US Department of Commerce
Award Dates: 10/1/2012 - 9/30/2014
Participants
Project Lead: Graham, Wendy Dimbero
Project Participants: Martinez, Christopher J.; Alison Adams, Tampa Bay Water; Jessica Bolson, SECC; UF, Ben Kirtman, U Miami; Vasu Misra, FSU; Kevin Morris, MRWSA; Jayantha Obeysekera, SFWMD; Lisette Staal, UF Water Institute
Goals and Objectives
The overall goal of this project is to improve the regional relevance of seasonal climate forecasts and increase their usability for multiple water managers in Florida to minimize short-term operational risks for water supply as well as ecosystem restoration. This project is integrated with the Public Water Supply Utilities Climate Impacts Working Group see research project and related working group web-page.
The specific objectives of this project are to:
- Evaluate of the skill of the large-scale NMME seasonal climate predictions (temperature, precipitation, solar radiation, humidity, wind speed) on a daily basis over all seasons and over a common grid across the Southeast US. We will use the NMME set of seasonal hindcasts (http://iridl.ldeo.columbia.edu/SOURCES/.Models/.NMME/), which are from seven different global coupled ocean-atmosphere models.
- Statistically downscale the NMME forecasts to the watershed scale and evaluate the skill of these seasonal predictions over three specific domains: Peace River Manasota Regional Water Supply Authority, Tampa Bay Water and the South Florida Water Management District.
- Execute a comparative study across three organizations of the benefits and limitations of using seasonal climate forecasts for their operational needs using the following techniques: Interviews, Qualitative focus groups, Cross organizational comparisons and analysis.
Available Outputs
Title: Seasonal predictions of regional reference evapotranspiration (ETo) based on Climate Forecast System version 2 (CFSv2), Journal of Hydrometeorology, 2014.
Authors: Tian, D., C. Martinez, and W. Graham
Title: Forecasts of seasonal streamflow in West-Central Florida using multiple climate predictors. Journal of Hydrology 519, 1130-1140. 2014.
Authors: Risko, S.L. and C.J. Martinez
Title: Statistical downscaling multi-model forecasts for seasonal precipitation and surface temperature over southeastern USA. Journal of Climate, 2014 (DOI: 10.1175/JCLI-D-13-00481.1)
Authors: Tian, D., C. Martinez, W. Graham, and S. Hwang
Title: NOAA SARP Project (NA12OAR4310130) Final Report
Authors: Staal, Lisette
Sponsor
US Department of Commerce National Oceanic and Atmospheric Administration
Award Dates
9/1/2011 - 8/31/2014
Participants
Project Lead
Graham, Wendy Dimbero
Project Participants
Ingram, Keith Talbert
Irani, Tracy Anne
Additional Participants
Sebastian Galindo, Christopher Martinez, Vasu Misra, FSU, Lisette Staal, UF Water Institute
Goals and Objective
The University of Florida Water Institute, Florida State University and the Southeast Climate Consortium, along with representatives from seven major public water supply utilities and three Water Management Districts in Florida, propose to develop and implement a collaborative Working Group to increase the regional relevance and usability of climate and sea level rise data and tools for the specific needs of water suppliers and resources managers in Florida. The Florida Water and Climate Alliance (FloridaWCA) Working Group will operate as a learning and collaboration platform and will employ participatory methods and a knowledge management framework to promote shared knowledge, data, models and decision-making tools.
Available Outputs
Title: Assessment of alternative methods for statistically downscaling daily GCM precipitation outputs to simulate regional streamflow. JAWRA Journal of the American Water Resources Association 50 (4), 1010-1032, 2014.
Authors: Hwang, S., and W. Graham
Title: Assessment of the utility of dynamically-downscaled regional reanalysis data to predict streamflow in west central Florida using an integrated hydrologic model, Reg Environ Change DOI 10.1007/s10113-013-0406-x
Authors: Hwang, Syewoon, Wendy D. Graham, Alison Adams, and Jeffrey Geurink
Title: Development and comparative evaluation of a stochastic analog method to downscale daily GCM precipitation, Hydrol. Earth Syst. Sci., 17, 4481-4502, 2013. doi:10.5194/hess-17-4481-2013
Authors: Hwang, Syewoon and Wendy D. Graham
Title: NOAA SARP Project (NA11-OAR4310110) Final Report
Authors: Staal, Lisette
Sponsor
National Science Foundation
Award Dates
3/1/2009 - 2/28/2013
Participants
Project Lead
Graham, Wendy Dimbero
Project Participants
Cohen, Matthew J
Martin, Jonathan Bowman
Additional Participants
Joseph Delfino, Jim Heffernam (FIU), Ray Thomas
Goals and Objective
This project explored the biotic and hydrologic controls over riverine elemental cycles, focusing of N (due to high levels of N enrichment in the regional groundwater system) and Ca ( because the mechanisms of spring-river channel formation are unknown). Detailed elemental budgets were developed for these elements under different hydrologic regimes, and the relationship between discharge and water age was examined to better reconcile the links between discharge concentrations of key contaminants and the reported extremely long lags (ca. 30 years) between recharge in the springshed and discharge at the spring vent. This work was conducted in collaboration with Florida International University.
Available Outputs
Title: Algal blooms and the nitrogen-enrichment hypothesis in Florida springs: evidence, alternatives, and adaptive management, Ecological Applications, 20(3), 2010, pp. 816-829
Authors: Heffernan, J. B., Liebowitz, D. M., Frazer, T. K., Evans, J. M. and M. J. Cohen
Title: Controls on diel metal cycles in a biologically productive carbonate-dominated river
Authors: Marie J. Kurz, Véronique de Montety, Jonathan B. Martin, Matthew J. Cohen, Chad R. Foster
Title: Denitrification and inference of nitrogen sources in the karstic Floridan Aquifer. Biogeosciences 9, 1671-1690. doi:10.5194/bg-9-1671-2012
Authors: Heffernan, J. B., A. Albertin, M. Fork, B. Katz, and M.J. Cohen
Title: Diel Phosphorus Variation and the Stoichiometry of Ecosystem Metabolism in a Large Spring-Fed River.
Authors: Cohen, M.J., Marie J. Kurz, James B. Heffernan, Jonathan B. Martin, Rachel L. Douglass, Chad R. Foster, and Ray G. Thomas
Title: Environmentally-mediated consumer control of algal proliferation in Florida springs
Authors: Dina M. Liebowitz, Matthew J. Cohen, James B. Heffernan, Lawrence V. Korhnak and Thomas K. Frazer
Title: Nitrate reduction mechanisms and rates in an unconfined eogenetic karst aquifer at two sites with different redox potential, Journal of Geophysical Research- Biogeosciences, doi:10.1002/2016JG003463
Authors: Henson, W. R., G. Huang, W.D. Graham, and A. Ogram
Title: Organic and inorganic carbon dynamics in a karst aquifer: Santa Fe River Sink-Rise system, north Florida, USA. Journal of Geophysical Research: Biogeosciences. 2014. Vol 119, Issue 3 340-357. doi:10.1002/2013JG002350.
Authors: Jin, J., A. R. Zimmerman, P. J. Moore and J. B. Martin
Title:Spatially Distributed Denitrification in a Karst Springshed, Hydrologic Processes, 33(8), 1191-1203, https://doi.org/10.1002/hyp.13380, 2019.
Authors: Henson, W. R., , M. J. Cohen, and W.D. Graham
Title: Spatiotemporal variations in carbon dynamics during a low flow period in a carbonate karst watershed: Santa Fe River, Florida, USA. Biogeochemistry, Vol. 122, Issue 1, pgs. 131-150, 2015.
Authors: Jin, J., A. R. Zimmerman, J. B. Martin, M. B. Khadka
Title: Transport of dissolved carbon and CO2 degassing from a river system in a mixed silicate and carbonate catchment. Journal of Hydrology. 2014. 513: 391-402
Authors: Khadka, M. B., J. B. Martin, J. Jin
Sponsor
National Science Foundation
Award Dates
8/1/2009 - 7/31/2012
Participants
Project Lead
Graham, Wendy Dimbero
Project Participants
Cohen, Matthew J
Delfino, Joseph J
Martin, Jonathan Bowman
Slatton, Kenneth Clint,
Additional Participants
Ray Thomas
Goals and Objective
The goal of this project was to improve understanding of surface and groundwater mixing dynamics, and the control that mixing exerts on chemical fluxes, in karst river basins. Our overarching hypothesis was that strong coupling between riverine hydrology and biogeochemistry yields a suite of natural tracers that, when measured at temporal densities concordant with water fluxes (i.e., daily or sub-daily), can yield new insights into riverine source water and mixing dynamics. To enhance understanding of the dynamic coupling between watershed elemental budgets and hydrologic variability we proposed a suite of high temporal resolution measurements of these solutes coupled with improved quantification of riverine mixing from natural tracers. Moreover, we predicted that this new information on surface water-groundwater mixing in rivers would allow improved model conceptualization and parameterization that will increase prediction accuracy of in-stream, and near-stream hydrologic chemical fluxes.
We proposed three coupled science and engineering questions: 1) What are the temporal and longitudinal dynamics of surface-groundwater mixing, and how do these affect the delivery of ecologically relevant solutes (nitrate, phosphate, H+, dissolved organic carbon)? 2) To what magnitude, and over what spatiotemporal domain, does assimilation of high resolution stream chemistry data into integrated, parallel watershed models (e.g., PARFLOW) improve predictions of stream flow, groundwater elevation, surface/groundwater mixing and solute transport?3) To what extent are real-time predictions of stream flow and surface/groundwater mixing ratios improved when Bayesian network models incorporate high resolution stream chemistry measurements and process model predictions along with mission agency data?
Available Outputs
Title: Characterization of groundwater and surface water mixing in a semi-confined karst aquifer using time lapse electrical resistivity tomography. Water Resources Research, DOI: 10.1002/2013WR013991,in press, 2014.
Authors: Meyerhoff, S, R. Maxwell, A. Revil, J. Martin, M. Karaoulis, and W. Graham
Title: A particle-tracking scheme for simulating pathlines in coupled surface-subsurface flows, Advances in Water Resources, Volume 52, Pages 7-18, 2013.
Authors: de Rooij, R., Graham, W., Maxwell, R.M.
Title: A Scalable Approach to Fusing Spatio-Temporal Data to Estimate Streamflow via a Bayesian Network, IEEE Transactions on Geoscience and Remote Sensing, Vol PP, Issue 99, doi:10.1109/TGRS.2010.2049115, 2010.
Authors: Nagarajan K., C. Krekeler, K. C. Slatton, and W. D. Graham
Title: Effects of Antecedent Hydrogeologic Conditions on Flood Magnitude and Recharge to the Floridan Aquifer in North-Central Florida
Authors: Ball, C. and J.B. Martin
Title: From rainfall to spring discharge: Coupling conduit flow, subsurface matrix flow and surface flow in karst systems with a discrete-continuum model, Advances in Water Resources,Volume 61, Pages 29-41, 2013.
Authors: de Rooij, R., P. Perrochet, and W. Graham
Title: Influence of diel biogeochemical cycles on carbonate equilibrium in a karst river. Chemical Geology
Authors: De Montety, V., J.B. Martin, M.J. Cohen, M.J. Kurz and C.R. Foster
Title: Insights on geologic and vegetative controls over hydrologic behavior of a large complex basin - Global Sensitivity Analysis of an integrated parallel hydrologic model
Authors: Srivastava, V., W. Graham, R. Munoz-Carpena, and R. Maxwell
Title: Time variant cross-correlation to assess residence time of water, implication for hydraulics of a sink/rise karst system, Water Resources Research, v. 47 W05547, doi: 10.1029/2010WR009613, 2011
Authors: Bailly-Comte, V., et al.
Title: Visualization of conduit-matrix conductivity differences in a karst aquifer using time-lapse electrical resistivity, GEOPHYSICAL RESEARCH LETTERS, VOL. 39, L24401, doi:10.1029/2012GL053933, 2012
Authors: Meyerhoff, Steven B., Marios Karaoulis, Florian Fiebig, Reed M. Maxwell, Andre Revil, Jonathan B. Martin, and Wendy D. Graham
Sponsor
National Science Foundation
Award Dates
12/1/2006 - 11/30/2009
Participants
Project Lead
Graham, Wendy Dimbero
Project Participants
Cohen, Matthew J
Delfino, Joseph J
Martin, Jonathan Bowman
Slatton, Kenneth Clint
Additional Participants
Kathleen McKee
Goals and Objective
Watershed characterization requires well-planned sampling to track simultaneous time-variable fluxes and flowpaths of water, nutrients, sediments, and energy. In this research project legacy hydrologic, meteorologic and water quality data from the Santa Fe basin in the Suwannee river watershed were assembled into a web-accessible digital watershed. These data, together with predictions from physically-based hydrologic models, were used to develop a probabilistic algorithm to predict surface water stage and flux throughout the Santa Fe river basin and evaluate the accuracy of these predictions. Information on prediction uncertainty was used to design a spatial network of new conductivity-temperature-depth (CTD) sensors to improve the predictions. The adequacy of the assembled data and the utility of the optimal estimation algorithm was evaluated by comparing resulting predictions with observations of surface water stage and flux from the newly deployed CTD sondes.
In addition, off-the-shelf optical and cadmium reduction continuous nitrate sensors were deployed at selected locations in the Santa Fe watershed to develop improved local relationships among flow, stage, conductivity and nitrate. This new knowledge laid the groundwork for developing a general methodology to augment continuous measurement of nitrate with correlated surrogates (i.e., in this case flow and conductivity) to decrease the density of sensors needed to accurately predict the nitrate in the system over space and time. Furthermore, the data laid the groundwork for developing improved understanding of the chemical and physical controls of nitrate and water fluxes through watersheds required to address science questions that could be answered with previously available data sampling and monitoring programs.
Available Outputs
Title: A Method for Measuring the Incremental Information Contributed from Non-Stationary Spatio-Temporal Data to Be Fused, doi: 10.1109/IGARSS.2008.4778977, vol. 2, pp. II-261 - II-264, Proc. IEEE 2008 IGARRS.
Authors: Carolyn Krekeler, Karthik Nagarajan, K. Clint Slatton
Title: A Scalable Approach to Fusing Spatiotemporal Data to Estimate Streamflow via a Bayesian Network
Authors: Nagarajan, K.; Krekeler, C.; Slatton, K.C.; Graham, W.D.
Title: Direct and indirect coupling of primary production and diel nitrate dynamics in a subtropical spring-fed river
Authors: James B. Heffernan and Matthew J. Cohen
Title: Environmentally-mediated consumer control of algal proliferation in Florida springs
Authors: Dina M. Liebowitz,Matthew J. Cohen, James B. Heffernan, Lawrence V. Korhnak and Thomas K. Frazer
Title: Hydrologic and biotic influences on nitrate removal in a subtropical spring-fed river. Limnol. Oceonogr. 55(1), 2010, 249-263.
Authors: Heffernan, J.B., M.J. Cohen, T.K. Frazer, R.G. Thomas, T.J. Rayfield, J. Gulley, J.B. Martin, J.J. Delfino, W.D. Graham
Title: Inferring nitrogen removal in large rivers from high-resolution longitudinal profiling
Authors: Robert T. Hensley, Matthew J. Cohen, and Larry V. Korhnak
Title: Probabilistic Fusion of spatio-temporal data to estimate stream flow via Bayesian belief networks,pp.4870 - 4873, doi: 10.1109/IGARSS.2007.4423952. Proc. IEEE 2007 IGARRS.
Authors: K. Nagarajan, C. Krekeler, K. C. Slatton
Sponsor
Suwannee River Water Management District
Award Dates
7/2013 - 12/2013
Participants
Project Lead
Graham, Wendy Dimbero
Additional Participants
Clark, Mark
Cohen, Matt
Frazer, Tom
Martin, Jon
Goals and Objective
The Suwannee River Water Management District contracted with the University of Florida Water Institute to convene a panel of experts to perform an independent peer review of the data, assumptions, methodologies, and conclusions of the report entitled, “Proposed Minimum Flows and Levels for the Lower Santa Fe and Ichetucknee Rivers and Associated Priority Springs”, and to prepare a report summarizing the collective scientific opinions of the group.
Available Outputs
Title: Peer Review of the Lower Santa Fe and Ichetucknee River and Associated Priority Springs Minimum Flows and Levels: Final Report
Authors: Graham W. , Clark M., Cohen M., Frazer T., and J. Martin
Sponsor
St. Johns River Water Management District
Award Dates
6/24/2009 - 9/30/2010
Participants
Project Lead
Graham, Wendy Dimbero
Additional Participants
Lisette Staal, UF Water Institute
Goals and Objective
Every five years the St. Johns River Water Management District (SJRWMD) prepares a District Water Supply Assessment (WSA) and District Water Supply Plan (DWSP). The SJRWMD uses groundwater flow models to predict groundwater level change in the Northeast Florida aquifer systems that would occur if the additional water use forecast for the region was obtained strictly from groundwater. The predicted groundwater level changes in the aquifer systems are the basis for the determination of Priority Water Resource Caution Areas.
The SJRWMD contracted with the University of Florida Water Institute to facilitate a Groundwater Modeling Subgroup for the 2010 Water Supply Planning Process. The purpose of the Groundwater Modeling Subgroup was to assess the groundwater models used in support of the St. Johns River and Suwannee River Water Management Districts' planning process for the Northern Planning Area, to identify weaknesses in the models that significantly limit the models - acceptability, and to recommend improvements (if necessary) to make the models acceptable.
Available Outputs
Title: St Johns River and Suwannee River Water Management Districts 2010 Water Supply Plan Groundwater Modeling Subgroup Final Report
Authors: Graham W. and L. Staal
Sponsor
St. Johns River Water Management District
Award Dates
3/26/2009 - 9/30/2010
Participants
Project Lead
Gao, Bin
Project Participants
Graham, Wendy Dimbero
Additional Participants
Osvaldo Gargiulo, Kathleen McKee
Goals and Objective
The Suwannee River Basin (SRB) in Florida contains an abundance of springs discharging groundwater from the Floridan aquifer system (FAS). Historic large-scale groundwater withdrawals in northeastern Florida and southeastern Georgia may have contributed to the lowering of the potentiometric surface of the Upper Floridan Aquifer (UFA) more than 10 feet over a very large area (Bush and Johnston, 1988).
This project involved collection of historic hydrologic data (groundwater levels, rainfall, streamflow, spring discharge) and compilation groundwater withdrawal estimates in counties in the SRB in Florida and Georgia from 1980 to 2007. Statistical trend, correlation and cluster analyses of these data were conducted on time series that had more than 10 years of consistent data within the January 1980 to December 2007 study period.
Results from statistical trend analyses showed that 12 out of 132 groundwater wells had statistically significant downward trends at the 95% confidence level for the 1980-2007 time period. For the rainfall data, 1 out of 44 stations had a statistically significant downward trend at the 95% confidence level for the 1980-2007 time period. No statistically significant trends were detected for the 22 streamflow stations over the study period. There was insufficient spring flow data (i.e., less than 10 years of observations with sporadic measurements) to conduct the statistical analyses.
Uncertainty regarding the accuracy of the groundwater withdrawal records compiled, and conflicting results from the various statistical trend analyses of these records, suggest that these groundwater withdrawal data were not of sufficient quality to draw reliable conclusions about trends in these data or correlations with groundwater level trends.
In the supplement report, the entire period of record for historic groundwater levels (upper Floridan) data in the Suwannee River basin and northeast Florida were analyzed for long-term trends and cluster analysis. In the final report under the original contract, groundwater level data available prior to 1980 was neglected since other time series of interest (principally groundwater withdrawal estimates) were not consistently available before then.
Available Outputs
Title: Statistical Evaluation of Hydrologic Data in Northeastern Florida and Southern Georgia: Final Report
Authors: Gao, B., McKee, K., Gargiulo, O. and W. D. Graham
Title: Statistical Evaluation of Long-Term Groundwater Level in Northeastern Florida and Southern Georgia: Supplemental Report
Authors: Gao, B., McKee, K., Gargiulo, O. and W. D. Graham
Sponsor
National Association of State Universities and Land-Grant Colleges
Award Dates
8/1/2006 - 6/30/2010
Participants
Project Lead
Graham, Wendy Dimbero
Additional Participants
Dorota Haman, James Jawitz, James W. (Jim) Jones, Jasmeet Judge, Yuncong Li, Rao Mylavarapu, Konda Ramesh Reddy, Sanjay Shukla
Goals and Objective
The overall goal of this project is to enhance water resource management in India through collaborative research and education activities between the University of Florida (UF) and North Carolina Agricultural and Technical State University (NCA&T) in the US, and Acharya N. G. Ranga Agricultural University (ANGRAU), Punjab Agricultural University (PAU), and the Institute for Agricultural Research (IARI) in India. Specific areas of water resource management that will be addressed include: 1) sustainable use of water resources, 2) water quality management and remediation, 3) use of simulation models in water resource-agricultural-ecosystem management, 4) improved water use efficiency and drought management.
A supplementary project, "Integrating gender and social issues in watershed management projects of the Indo-US Agricultural Knowledge Initiative (AKI): A Pilot Study", was funded by USDA Capacity Building and Water Resource Management programs in an effort to incorporate social and gender issues into AKI projects. USDA funded ICRISAT directly with the UF Water Institute as a key partner linking directly to the AKI project described above. Objectives of this project include: 1)Ensuring that attention to gender and social issues are incorporated in the research of one of the NASULGC funded projects at the University of Florida in the priority area of Water Resource Management, and 2) Sharing lessons learned from the research in one watershed and from case studies from other watersheds developed by ICRISAT.
Available Outputs
Title: Future irrigation expansion outweigh groundwater recharge gains from climate change in semi-arid India, Science of the Total Environment, 635, 725-740, September 2018.
Authors: Sishodia, R.P., S. Shukla, S Wani, W. Graham, and J. Jones
Title: Bi-decadal groundwater level trends in a semi-arid South Indian region: Declines, causes and management, Journal of Hydrology-Regional Studies, Vol. 8, 43-58, 2016
Authors: Sishodia, R.P., S. Shukla, W. Graham, S Wani, and K. Garg
Title: Current and future groundwater withdrawals: Effects, management and energy policy options for a semi-arid Indian watershed, Advances in Water Resources, doi.org/10.1016/j.advwatres.2017.05.014
Authors: Sishodia, R.P., S. Shukla, W. D. Graham, S Wani, J. W. Jones and J. Heaney
Title: Identifying irrigation and nitrogen best management practices foraerobic rice-maize cropping system for semi-arid tropics usingCERES-rice and maize models. Agricultural Water Management: 149 (2015) 23-32.
Authors: Kadiyala, M.D.M., J.W. Jones, R.S.Mylavarapu, Y.C. Li, and M.D. Reddy
Title: Impact of Aerobic Rice Cultivation on Growth, Yield, and Water Productivity of Rice-Maize Rotation in Semiarid Tropics, Agron. J. 104:1757-1765 (2012), doi:10.2134/agronj2012.0148.
Authors: Kadiyala, M. D. M., R. S. Mylavarapu, Y. C. Li, G. B. Reddy, and M. D. Reddy
Title: Study of spatial water requirements of rice under various crop establishment methods using GIS and crop models, Journal of Agrometeorology 17 (1) : 1-10 (June 2015).
Authors: Kadiyala, M.D.M., James W. Jones, R.S. Mylavarapu, Y. C. Li, M.D.Reddy, and M. Umadevi
Title: Uptake efficiency of 15N-urea in flooded and aerobic rice fields under semi-arid conditions, Paddy and Water Environment, 2014. DOI 10.1007/s10333-014-0473-8.
Authors: Kadiyala, M.D.M., R. S. Mylavarapu, Y. C. Li, G. B. Reddy, K. R. Reddy, and M. D. Reddy
Title: 2009 Colloquium for UF AKI Project
Authors: Staal, Lisette
Sponsor
FL Department of Environmental Protection
Award Dates
9/12/2002 - 9/30/2009
Participants
Project Lead
Graham, Wendy Dimbero
Project Participants
Shukla, Sanjay
Additional Participants
Michael Annable, Ken Campbell, Pat Hogue, Pat Miller, Vimala Nair, George O'Connor
Goals and Objective
Lake Okeechobee is a large, multi-functional lake located at the center of the Kissimmee-Okeechobee-Everglades aquatic ecosystem. The lake provides regional flood protection, water supply for agricultural, urban and natural areas, and is a critical habitat for fish, birds and other wildlife, including the federally endangered Everglades Snail Kite. The 1997 Lake Okeechobee Surface Water Improvement and Management (SWIM) Plan found that excessive phosphorus loading is one of the most serious problems facing the lake. Frequent algal blooms, detrimental changes in biological communities, and impaired use of the water resources are among the documented adverse effects of excessive phosphorus loading. The purpose of this interdisciplinary research project is to reduce phosphorus loadings to Lake Okeechobee from Beef Cattle Ranches by developing Best Management Practices (BMPs) and implementing them at the ranch scale. Pre- and post-BMP surface and groundwater monitoring will be conducted to evaluate the effectiveness of the BMPs at improving surfacewater quality while maintaining acceptable productivity. The data collected will be used in the development of computer models that simulate the impacts of various BMP alternatives, and assist landowners in choosing the most cost-effective BMPs to implement
Available Outputs
Title: Aluminum Water Treatment Residuals for Reducing Phosphorus Loss From Manure-Impacted, High-Watertable Soils (pdf)
Authors: Rew, T. J.
Title: Evaluating the Effectiveness of Best Management Practices to Reduce Nutrient Loadings from Beef Cattle Ranches to Lake Okeechobee: Final Report
Authors: Graham, W.D. et al.
Title: Flow and Nutrient Contributions from Groundwater to a Drainage Ditch in a Beef Cattle Ranch in the Lake Okeechobee Basin, Florida
Authors: Goswami, D., S. Shukla, and W.D. Graham
Title: Selection and Evaluation of Soil Amendments to Reduce Edge-of-Field P Losses (pdf)
Authors: O'Connor, G.A.
Title: Soil Amendments Rainfall Simulator Evaluation (pdf)
Authors: Graetz, D.A.
Title: Summary of Passive Flux Meter Deployments at Pelaez Ranch (pdf)
Authors: Annable, M.D.
Title: Water Quality Effectiveness of Ditch Fencing and Culvert Crossing in the Lake Okeechobee Basin, Southern Florida
Authors: Shukla, S, D. Goswami, W.D. Graham, A.W. Hodges, M.C. Christman, and J.M. Knowles
Sponsor
FL Department of Environmental Protection
Award Dates
12/13/1999 - 12/12/2003
Participants
Project Lead
Graetz, Donald A.
Project Participants
Graham, Wendy Dimbero
Additional Participants
Michael Dukes, George Hochmuth, Rao Mylavarapu
Goals and Objective
Water quality has been the subject of concern and attention in the Suwannee River Basin for a number of years. Recent data have indicated increasing concentration of nutrients in groundwater, spring water, and private drinking water wells in the region. The purpose of this interdisciplinary research project is to reduce nutrient loadings to groundwater from agricultural row crops by developing Best Management Practices (BMPs) and implementing them at the farm level. Pre- and post-BMP soil and groundwater monitoring will be conducted to evaluate the effectiveness of the BMPs at improving groundwater quality while maintaining acceptable crop yields. The data collected will be used in the development of computer models that simulate the impacts of various BMP alternatives, and assist landowners in choosing the most cost-effective BMPs to implement.
Available Outputs
Title: Evaluating Effectiveness of Best Management Practices for Animal Waste and Fertilizer Management to Reduce Nutrient Inputs into Ground Water in the Suwannee River Basin
Authors: Graetz, D.A.
Sponsor
FL Department of Agriculture & Consumer Services
Award Dates
7/1/1992 - 12/31/2004
Participants
Project Lead
Graham, Wendy Dimbero
Goals and Objective
In some agricultural regions of Florida, the frequency of drinking water wells contaminated by nitrate nitrogen exceeds the national frequency found in the EPA survey conducted in 1990. Of 3,949 drinking water wells analyzed for nitrate-nitrogen by the Florida Department of Agriculture and Consumer Services (FDACS) and the Florida Department of Environmental Protection (FDEP), 2,483 (63%) contained detectable nitrate-nitrogen and 584 (15%) contained nitrate-nitrogen above the EPA MCL. Of the 584 wells statewide that exceeded the MCL, 519 were located in the Central Florida Ridge citrus growing region, encompassed primarily by Lake, Polk, and Highlands Counties.
The goals and objectives of this research project were to: (1) generate baseline groundwater nitrate data from several commercial citrus groves in the Central Florida Ridge region in order to relate current groundwater nitrate trends to existing and historic management practices; (2) develop recommendations for alternative nutrient and water management practices for each cooperator site intended to reduce off-site groundwater nitrate impacts associated with citrus production; and (3) assess the impacts of alternative management practices on groundwater nitrate-nitrogen through comprehensive monitoring and modeling.
Available Outputs
Title: Impact of Alternative Citrus Management Practices on Groundwater Nitrate in the Central Florida Ridge: I. Field Investigation, Transactions ASABE VOL. 42(6): 1653-1668, 1999.
Authors: Lamb, S. T., Graham, W. D., Harrison, C. B. and A. K. Alva
Title: Impact of Alternative Citrus Management Practices on Groundwater Nitrate in the Central Florida Ridge: II. Numerical Modeling, Transactions ASABE, VOL. 42(6): 1669-1678, 1999.
Authors: Harrison, C. B., Graham, W. D., Lamb, S. T. and A. K. Alva