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Relationships Between Water Table and Model Simulated ET
Author(s) -
Jayakody Priyantha,
Parajuli Prem B.,
Sassenrath Gretchen F.,
Ouyang Ying
Publication year - 2013
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/gwat.12053
Subject(s) - water table , hydrology (agriculture) , environmental science , watershed , soil and water assessment tool , groundwater , groundwater recharge , thematic map , evapotranspiration , table (database) , streamflow , drainage basin , aquifer , geology , geography , database , geotechnical engineering , cartography , machine learning , ecology , computer science , biology
This research was conducted to develop relationships among evapotranspiration ( ET ), percolation ( PERC ), groundwater discharge to the stream ( GWQ ), and water table fluctuations through a modeling approach. The Soil and Water Assessment Tool ( SWAT ) hydrologic and crop models were applied in the Big Sunflower River watershed ( BSRW ; 7660 km 2 ) within the Yazoo River Basin of the Lower Mississippi River alluvial plain. Results of this study showed good to very good model performances with the coefficient of determination ( R 2 ) and Nash‐Sutcliffe efficiency ( NSE ) index from 0.4 to 0.9, respectively, during both hydrologic and crop model calibration and validation. An empirical relationship between ET , PERC , GWQ , and water table fluctuations was able to predict 64% of the water table variation of the alluvial plain in this study. Thematic maps were developed to identify areas with overuse of groundwater, which can help watershed managers to develop water resource programs.