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**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** THIS PROJECT WILL INVESTIGATE CONJUNCTIVE FRESHWATER-SALTWATER MANAGEMENT (CFSM) AS A STRATEGY TO COPE WITH THE CONSTRAINTS OF GROWING DEMAND FOR LIMITED FRESHWATER RESOURCES AND CLIMATE VARIABILITY AND CHANGE IN WATER-SCARCE AGRICULTURAL WATERSHEDS. THE CENTRAL HYPOTHESIS IS THAT NATURALLY OCCURRING SALINE WATERS IN AGRICULTURAL AREAS CAN BE USED TO REDUCE RELIANCE ON FRESHWATER SUPPLIES FOR CROPS WHILE SUPPORTING ECONOMICALLY AND ECOLOGICALLY IMPORTANT AGROECOSYSTEM SERVICES. THERE IS A CRITICAL NEED FOR A ROBUST UNDERSTANDING OF AGROECOSYSTEM IMPACTS AND TRADE-OFFS ASSOCIATED WITH CHANGING SALINITY DYNAMICS DUE TO ALTERNATE USE OF SALINE WATER AND FRESHWATER OR MIXING SALINE WATER WITH FRESHWATER FOR IRRIGATION. THE OBJECTIVES OF OUR PROJECT ARE: (1) INCORPORATE SALINITY EQUILIBRIUM CHEMISTRY IN SWAT-MODFLOW, AN EXISTING COUPLED SURFACE WATER-GROUNDWATER MODELING FRAMEWORK, TO DEVELOP AND TEST SWAT-MODFLOW-SALT FOR WATERSHED-SCALE SPATIALLY DISTRIBUTED COUPLED SIMULATION OF SURFACEWATER-GROUNDWATER SALT FATE AND TRANSPORT, ACCOUNTING FOR DIFFERENT IRRIGATION WATER SOURCES AND SALT BUILDUP IN THE STREAM NETWORK, SOIL, AND AQUIFER, AND EFFECT ON CROP YIELD; (2) CONDUCT FIELD MONITORING OF MAJOR SALT IONS AND MINERALS IN SURFACE WATER, SOIL, AND GROUNDWATER TO CALIBRATE AND VALIDATE SWAT-MODFLOW-SALT; (3) CONDUCT A COMPREHENSIVE MODEL-BASED ANALYSIS OF CFSM AS AN ADAPTATION STRATEGY TO REDUCE RELIANCE ON FRESHWATER RESOURCES; AND (4) ASSESS POTENTIAL AGROECOSYSTEM IMPACTS (I.E., SOIL AND STREAM SALINITY CHANGES) UNDER DIFFERENT SCENARIOS OF IRRIGATION WATER SOURCE IN CFSM DURING WET AND DRY CLIMATE CYCLES.

$749,786FY2022National Institute of Food and AgricultureUSDA

Oklahoma State University, Stillwater OK

Investigators

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**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** THIS PROJECT WILL INVESTIGATE CONJUNCTIVE FRESHWATER-SALTWATER MANAGEMENT (CFSM) AS A STRATEGY TO COPE WITH THE CONSTRAINTS OF GROWING DEMAND FOR LIMITED FRESHWATER RESOURCES AND CLIMATE VARIABILITY AND CHANGE IN WATER-SCARCE AGRICULTURAL WATERSHEDS. THE CENTRAL HYPOTHESIS IS THAT NATURALLY OCCURRING SALINE WATERS IN AGRICULTURAL AREAS CAN BE USED TO REDUCE RELIANCE ON FRESHWATER SUPPLIES FOR CROPS WHILE SUPPORTING ECONOMICALLY AND ECOLOGICALLY IMPORTANT AGROECOSYSTEM SERVICES. THERE IS A CRITICAL NEED FOR A ROBUST UNDERSTANDING OF AGROECOSYSTEM IMPACTS AND TRADE-OFFS ASSOCIATED WITH CHANGING SALINITY DYNAMICS DUE TO ALTERNATE USE OF SALINE WATER AND FRESHWATER OR MIXING SALINE WATER WITH FRESHWATER FOR IRRIGATION. THE OBJECTIVES OF OUR PROJECT ARE: (1) INCORPORATE SALINITY EQUILIBRIUM CHEMISTRY IN SWAT-MODFLOW, AN EXISTING COUPLED SURFACE WATER-GROUNDWATER MODELING FRAMEWORK, TO DEVELOP AND TEST SWAT-MODFLOW-SALT FOR WATERSHED-SCALE SPATIALLY DISTRIBUTED COUPLED SIMULATION OF SURFACEWATER-GROUNDWATER SALT FATE AND TRANSPORT, ACCOUNTING FOR DIFFERENT IRRIGATION WATER SOURCES AND SALT BUILDUP IN THE STREAM NETWORK, SOIL, AND AQUIFER, AND EFFECT ON CROP YIELD; (2) CONDUCT FIELD MONITORING OF MAJOR SALT IONS AND MINERALS IN SURFACE WATER, SOIL, AND GROUNDWATER TO CALIBRATE AND VALIDATE SWAT-MODFLOW-SALT; (3) CONDUCT A COMPREHENSIVE MODEL-BASED ANALYSIS OF CFSM AS AN ADAPTATION STRATEGY TO REDUCE RELIANCE ON FRESHWATER RESOURCES; AND (4) ASSESS POTENTIAL AGROECOSYSTEM IMPACTS (I.E., SOIL AND STREAM SALINITY CHANGES) UNDER DIFFERENT SCENARIOS OF IRRIGATION WATER SOURCE IN CFSM DURING WET AND DRY CLIMATE CYCLES. · GrantIndex