[논문]댐 홍수조절을 위한 목표수위 산정연구

곽재원

doi:10.3741/jkwra.2021.54.7.545

댐 홍수조절을 위한 목표수위 산정연구
A study for the target water level of the dam for flood control 원문보기

Journal of Korea Water Resources Association = 한국수자원학회논문집, v.54 no.7, 2021년, pp.545 - 552

곽재원 (환경부 한강홍수통제소)

초록
AI-Helper

최근 기후변화로 인하여 빈발하는 수재해는 다목적댐의 운영 및 관리에 있어서 큰 부담으로 다가오고 있으며, 특히 2020년의 집중호우는 댐 관리에서의 홍수조절이 부각되는 계기가 되었다. 본 연구의 목적은 댐 관리자가 별도의 분석없이 홍수조절을 위한 용량과 목표수위를 간편하게 추정할 수 있는 방법론을 제시하는데 있다. 이를 위하여 일 단위의 댐 유입량과 방류량 계열에 빈도대응법을 적용하여 동일 재현빈도를 가지는 누적확률분포쌍으로 유도한 후 홍수유입량의 비율로 표현되는 홍수유입 대비 저류체적비 관계를 유도하고 그 특성을 분석하였다. 연구결과에 따라서, 소양강댐은 홍수유입체적의 45%, 충주댐은 홍수유입체적의 39%를 평균적으로 일시 저류함으로서 홍수조절에 기여하는 것으로 나타났다. 또한, 홍수유입 대비 저류체적비를 활용하여, 댐 홍수유입량을 기준으로 필요한 홍수조절용량과 목표수위를 간편하게 추정하기 위한 방법론과 도표를 제시하였다. 본 연구에서 제시된 방법과 기상청의 강우예측을 통하여 댐의 홍수조절을 위한 목표수위를 추정하는데 참고자료로서 활용 가능할 것으로 판단된다.

Abstract ▼ AI-Helper

The burden of flood control on the dam under frequently flood due to climate change and especially heavy flood in 2020 year are come to the forward and increased. The objective of the study is therefore to establish the method to estimate capacity and target water level for flood control in actual dam management. Frequency matching method was applied to establish a pair of cumulative distribution function (CDF) based on daily dam inflow and discharge records. The relationship between dam storage and discharge volume represented as a percentage of inflow volume was derived and its characteristics was analyzed. As the result, the Soyanggang (45%) and Chungju Dam (39%) contributing to flood control with temporarily storing flood runoff. The method and diagram to estimate flood control capacity and target water level for flood control in the dam were established. The result of the study could be used as a supplementary data for flood control of the dam according to the rainfall prediction on the Korea Meteorological Administration.

주제어

표/그림 (6)

그림 Fig. 1. Concept of frequency matching in NRCS method
그림 Fig. 2. Concept of dam operation at flood event; (a) dam operaion, (b) CDF plot of dam operation
그림 Fig. 3. Eatimation of dam storage amount at flood event (S_flood) in CDF; colored area indicate the amount of dam inflow and outflow
그림 Fig. 4. Study area and dam; red rectangular indicate the location of each dams, and colored area indicate that the upper basin area of each dam
그림 Fig. 5. Scatter plot of the ratio of storage volume to flood inflow volume at maximum flood event (p> 0.997) of each years; (a) Soyanggang Dam, (b) Chungju Dam; green circle indicate 2020 years flood event and blue dot line indicate flood control capacity of each dam, red line indicate regression line between storage and inflow volume of the dam, α indicate the slope of regression line, and M.m³ indicate million m³
그림 Fig. 6. Diagram to estimate flood capacity demand and target water level for flood control; (a) Soyanggang Dam, (b) Chungju Dam

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상세보기

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