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Water Balance Analysis of Pumped-Storage Reservoir during Non-Irrigation Period for Recurrent Irrigation Water Management

순환형 농업용수관리를 위한 농업용 저수지의 비관개기 양수저류 추정

  • Bang, Na-Kyoung (Department of Convergence of Information and Communication Engineering, Hankyong National University) ;
  • Nam, Won-Ho (School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, National Agricultural Water Research Center, Hankyong National University) ;
  • Shin, Ji-Hyeon (Department of Bioresources and Rural Systems Engineering, Hankyong National University) ;
  • Kim, Han-Joong (School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, Hankyong National University) ;
  • Kang, Ku (EKtechnology) ;
  • Baek, Seung-Chool (Korea Rural Community Corporation, Gyeonggi Regional Headquarter, Anseong District Office) ;
  • Lee, Kwang-Ya (Water Resources Planning Office Integrated Water Management Supporting Department, Korea Rural Community Corporation)
  • Received : 2020.05.05
  • Accepted : 2020.06.17
  • Published : 2020.07.31

Abstract

The extreme 2017 spring drought affected a large portion of South Korea in the Southern Gyeonggi-do and Chungcheongnam-do districts. This drought event was one of the climatologically driest spring seasons over the 1961-2016 period of record. It was characterized by exceptionally low reservoir water levels, with the average water level being 36% lower over most of western South Korea. In this study, we consider drought response methods to alleviate the shortage of agricultural water in times of drought. It could be to store water from a stream into a reservoir. There is a cyclical method for reusing water supplied from a reservoir into streams through drainage. We intended to present a decision-making plan for water supply based on the calculation of the quantity of water supply and leakage. We compared the rainfall-runoff equation with the TANK model, which is a long-term run-off model. Estimations of reservoir inflow during non-irrigation seasons applied to the Madun, Daesa, and Pungjeon reservoirs. We applied the run-off flow to the last 30 years of rainfall data to estimate reservoir storage. We calculated the available water in the river during the non-irrigation season. The daily average inflow from 2003 to 2018 was calculated from October to April. Simulation results show that an average of 67,000 tons of water is obtained during the non-irrigation season. The report shows that about 53,000 tons of water are available except during the winter season from December to February. The Madun Reservoir began in early October with a 10 percent storage rate. In the starting ratio, a simulated rate of 4 K, 6 K, and 8 K tons is predicted to be 44%, 50%, and 60%. We can estimate the amount of water needed and the timing of water pump operations during the non-irrigation season that focuses on fresh water reservoirs and improve decision making for efficient water supplies.

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