단기 홍수 지침 곡선을 이용한 남강댐의 홍수조절에 관한 연구
A Study for Flood Control of Namgang Dam with Flood Guide Curve in Flood Event
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초록
남강댐의 상류유역은 산악지형이 대부분이기 때문에 하상경사가 매우 급하고, 홍수 시 유량이 급격히 증가한다. 또한, 유역면적에 비해 홍수조절 용량이 매우 작고, 상․하류의 제약으로 인해 남강댐 운영자는 해마다 홍수시 댐 운영에 어려움을 겪고 있다. 본 연구의 목적은 남강댐의 홍수 시 효과적인 댐 운영을 위해 단기 홍수 지침 곡선을 제시하는데 있다. 이를 위해 과거 남강댐에서 발생한 14개의 주요 홍수사상을 분석하였고, 수문학적 홍수 추적 모형인 COSFIM을 이용하여 과거 주요 홍수사상을 모의하였다. 단기 홍수 지침 곡선은 홍수 지침 곡선의 적용 시점과 홍수 진행에 따른 지침 수위와 운영 구간을 추정함으로써 결정되었다. 본 연구에서 제시한 홍수 지침 곡선은 남강댐 홍수조절에 효과적으로 활용될 수 있을 것으로 기대한다.
Abstract
Upstream area of Namgang Dam is mountainous and has steep channel bed slopes, so the flood hydrograph from a storm rises rapidly. Namgang Dam operators have difficulties in flood control every year because the dam has small flood control capacity for catchment area and there are some restrictions on upstream and downstream of Namgang Dam to store or release water. The purpose of the study is to propose a flood guide curve in flood event of Namgang Dam for effective flood control. We analyzed major historical 14 flood events and simulated them by the COSFIM(Coordinate Operation System for Flood control In Multi-reservoir) that is hydrological flood routing model. The flood guide curve of Namgang Dam was determined by estimating application time of the flood guide curve and operation guide stages & ranges in process of flood time. The flood guide curve may be effectively used in flood control of Namgang Dam.
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