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Analysis of Emergency Water Supply Effects of Multipurpose Dams Using Water Shortage Index

용수부족지표를 이용한 다목적댐의 비상용수 공급 효과 분석

  • Lee, Gwang-Man (Korea Institute of Water & Environment, Kwater) ;
  • Yi, Jaeeung (Department of Civil Engineering, Ajou University)
  • Received : 2012.04.30
  • Accepted : 2012.08.07
  • Published : 2012.11.30

Abstract

One of the important purposes of most water resources systems is to prevent from drought damages. However, there are uncertainties in water supply plans from a reservoir due to factors such as limitation of available data, inaccuracy of surveyed data, unsuitability of analysis method, and climate change. In actual operating process, severe drought exceeding the water supply capability makes the normal water usage difficult. In Korea, however, alternative water source such as a development of new water project is very limited in case of water shortages due to drought. Especially, since there is no standard to evaluate the water supply effect considering severe drought damages, it is difficult to prepare the practical measures. In this study, water shortage events of existing multipurpose reservoirs are analyzed and the method of using low-storage emergency water supply is studied by using Water Shortage Index (WSI). The water shortage events are analyzed and the effect of water shortage decrease is evaluated using the existing inflow data of multi-purpose reservoirs. The results show that Imha, Daechung, Hapchon and Namkang reservoirs are highly vulnerable to the severe drought and required to develop additional emergency water source.

수자원 시스템의 중요한 기능 중 하나는 갈수 피해를 방지하는 것이다. 그러나 댐에 의한 용수공급계획은 이용 가능한 자료의 한계, 조사 자료의 부정확, 해석 방법의 부적합 그리고 기후변화 등의 요인에 의해 불확실성이 존재한다. 실제 운영과정에서는 이수안전도를 초과하는 이상가뭄 발생 시 용수부족이 발생하여 제한급수 등 정상적인 물이용이 불가능해진다. 그러나 우리나라는 가뭄에 의해 물부족이 발생할 경우 대체수원개발 등 딱히 마땅한 대처수단이 없으며, 갈수대책을 위한 수원확보도 미미한 실정이다. 특히 이상가뭄에 의한 피해정도를 고려하여 용수공급효과를 평가할 수 있는 기준이 마련되어 있지 못해 현실적인 대책을 마련하기 어려운 실정이다. 본 연구는 기 제시되어 있는 용수부족지표를 이용하여 기존 다목적댐의 저수(低水) 용량을 비상용수 공급원으로 활용하는 방안에 대하여 검토하였다. 기존 다목적댐의 유량자료를 이용하여 용수부족 사상을 분석하고 용수부족 감소효과를 평가하였다. 적용 결과 임하, 대청, 합천 및 남강댐의 경우 이상가뭄에 매우 취약한 것으로 나타났으며 가뭄대비용 비상용수의 추가 확보가 필요한 것으로 나타났다.

Keywords

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