Abstract
Considering the priority of water supply, agricultural water supply capacity downstream of the Yeongsan River Basin was evaluated in this study. The water balance was analyzed using the Please check all author names carefullyMODSIM-decision support system (MODSIM-DSS) to evaluate the agricultural water supply capacity. MODSIM-DSS can also be used to analyze the watershed demand status and agricultural water supply facilities. In this study, the watershed inflow and agricultural reservoir inflow (supply) data for each watershed were obtained using the SWAT outflow data. SWAT was calibrated and validated using 16-years (2005–2020) of daily streamflow data from one water level station and two weirs, by considering water withdrawal and return flows from agricultural, domestic, and industrial water use. The coefficient of determination (R2) was analyzed as 0.50 to 0.80 at three stations. Then, water balance analyses were performed for 41 years (1980–2020) by applying the SWAT outflow results to MODSIM-DSS. The results showed that agricultural water shortages of 517.8 × 106 m3, 520.0 × 106 m3, 579.8 × 106 m3, and 517.5 × 106 m3, occurred in 1992, 1994, 1995, and 2015, respectively. The efficiencies of agricultural water supply for these years were 58.2%, 58.0%, 53.2%, and 58.2%, respectively, which were lower than the 40-year average of 84.5%.
Highlights
The purpose of this study is to evaluate the agricultural water shortages in the Yeongsan River Basin by linking supply priorities with the watershed assessment tool and water network optimization model
Prior to implementing the water supply scenarios, the land use and agricultural facilities installed for water supply were analyzed, and the data for the actual water supply and water shortages were derived using MODSIM-DSS
In scenarios 1, 2, and 3, which were applied to a single facility, the monthly average water supply was 111.8 × 106 m3, 8.0 × 106 m3, and 3.6 × 106 m3, respectively, indicating that scenario 1 had the largest additional supply (Table 4)
Summary
We applied the water supply priority method, which can reduce the dependence on reservoirs and a supplementary water supply scenario according to the river management system regulations. The major objectives of this study were to. The purpose of this study is to evaluate the agricultural water shortages in the Yeongsan River Basin by linking supply priorities with the watershed assessment tool and water network optimization model
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