농업용 저수지의 이⋅치수 기능을 고려한홍수기 제한수위 설정 기법 개발
Determination of Flood-limited Water Levels of Agricultural Reservoirs Considering Irrigation and Flood Control
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In this study, we developed a method to determine the flood-limited water levels of agricultural reservoirs, considering both their irrigation and floodcontrol functions. Irrigation safety and flood safety indices were defined to be applied to various reservoirs, allowing for a comprehensive assessmentof the irrigation and flood control properties. Seasonal flood-limited water level scenarios were established to represent the temporal characteristics ofrainfall and agricultural water supply and the safety indices were analyzed according to these scenarios. The optimal scenarios were derived using aschematic solution based on Pareto front analysis. The method was applied to Obong, Yedang, and Myogok reservoirs, and the results showed thatthe characteristics of each reservoir were well represented in the safety indices. The irrigation safety of Obong reservoir was found to be significantlyinfluenced by the late-stage flood-limited water level, while those of Yedang and Myogok reservoir were primarily affected by the early and mid-stageflood-limited water levels. The values of irrigation safety and flood safety indices for each scenario were plotted as points on the coordinate plane,and the optimal flood-limited water levels were selected from the Pareto front. The storage ratio of the optimal flood-limited water levels for the early,mid, and late stages were 65-70%, 70%, and 75% for Obong reservoir, 75%, 70-75%, and 65-70% for Yedang reservoir, and 75-80%, 70%, and 50%for Myogok reservoir. We expect that the method developed in this study will facilitate efficient reservoir operations.
Abstract
In this study, we developed a method to determine the flood-limited water levels of agricultural reservoirs, considering both their irrigation and floodcontrol functions. Irrigation safety and flood safety indices were defined to be applied to various reservoirs, allowing for a comprehensive assessmentof the irrigation and flood control properties. Seasonal flood-limited water level scenarios were established to represent the temporal characteristics ofrainfall and agricultural water supply and the safety indices were analyzed according to these scenarios. The optimal scenarios were derived using aschematic solution based on Pareto front analysis. The method was applied to Obong, Yedang, and Myogok reservoirs, and the results showed thatthe characteristics of each reservoir were well represented in the safety indices. The irrigation safety of Obong reservoir was found to be significantlyinfluenced by the late-stage flood-limited water level, while those of Yedang and Myogok reservoir were primarily affected by the early and mid-stageflood-limited water levels. The values of irrigation safety and flood safety indices for each scenario were plotted as points on the coordinate plane,and the optimal flood-limited water levels were selected from the Pareto front. The storage ratio of the optimal flood-limited water levels for the early,mid, and late stages were 65-70%, 70%, and 75% for Obong reservoir, 75%, 70-75%, and 65-70% for Yedang reservoir, and 75-80%, 70%, and 50%for Myogok reservoir. We expect that the method developed in this study will facilitate efficient reservoir operations.
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