저수용량을 고려한 가뭄지수 산정과 가뭄관리에 관한 연구

Abstract

본 연구에서는 도시지역의 생활용수나 공업용수의 수급 체계에 있어서 가뭄에 의한 용수공급 부족시 가뭄관리 및 가뭄 심도에 따른 비상 급수대책 수립에 필요한 가뭄 예경보지수의 산정법을 개발하였다. 울산지역의 주요 생활용수 공급원인 사연댐을 대상으로 하였으며, 1980년부터 1996년까지의 저수량, 유입량, 공급량, 방류량 등의 실측된 수문자료를 이용하였다. 가뭄지수의 산정은 월 강우량의 초과확률에 근거를 두고 있는 기존의 Phillips 가뭄지수법을 이용하였다. 도시지역의 급수체계나 댐이나 저수지 등으로 이루어지는 경우, 월 강우량을 기본자료로 사용하는 Phillips 가뭄지수 산정법은 가뭄현상을 적절히 설명할 수 없으므로 가뭄관리의 주요변수인 유입량, 저수량, 방류량 및 공급량 등을 포함한 가뭄지수 계산법을 개발하였다. 그 결과 용수공급 능력을 고려한 Phillips 가뭄지수 산정법은 실제 가뭄현상에 대한 적용성이 상당히 우수한 것으로 나타났다.

The goal of the present research was to develop a means to determine indices of drought warning and emergency necessary to manage drought and establish water supply contingency plan for the municipal and industrial water supply system in urban areas. To do this, we worked on the Sayun catchment which is the main water source of Ulsan and used the measured hydrologic data (storage, inflow, supply, outflow)from 1980 to 1996. The indices of drought calculated by the method of Phillips drought index based only on monthly precipitation do not pertinently represent drought phenomena in case water supply is from dam or reservoir in an urban area. Therefore, we developed the drought index technique including inflow, storage, outflow and supply which are the chief factors of drought management. The result showed that the method of Phillips drought index considering the capacity of water supply was excellent when applied to practical drought phenomena.

The goal of the present research was to develop a means to determine indices of drought warning and emergency necessary to manage drought and establish water supply contingency plan for the municipal and industrial water supply system in urban areas. To do this, we worked on the Sayun catchment which is the main water source of Ulsan and used the measured hydrologic data (storage, inflow, supply, outflow)from 1980 to 1996. The indices of drought calculated by the method of Phillips drought index based only on monthly precipitation do not pertinently represent drought phenomena in case water supply is from dam or reservoir in an urban area. Therefore, we developed the drought index technique including inflow, storage, outflow and supply which are the chief factors of drought management. The result showed that the method of Phillips drought index considering the capacity of water supply was excellent when applied to practical drought phenomena.