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Journal of the Korean Society of Hazard Mitigation 2011;11(5):255-264.
Published online October 31, 2011.
선행함수조건을 고려한 유역대표 집중시간 및 저류상수의 결정
이지호, 유철상
Decision of Basin Representative Concentration Time and Storage Coefficient Considering Antecedent Moisture Conditions
Ji-Ho Lee, Chul-Sang Yoo
Abstract
This study evaluated how effective the use of selected rainfall events is for the decision of runoff characteristic such like concentration time and storage coefficient. The antecedent moisture condition (AMC) was adopted as the selection criterion. That is, the storm events were divided into three groups depending on the AMC and evaluated their spatial distribution, also the runoff characteristics derived were analyzed corresponding to each AMC group, and then it was proposed what rainfall events should be used for the decision of the runoff characteristics. In conclusion, the rainfall events of the AMC-III group were found to be more suitable for the decision of runoff characteristics of a basin.
Key Words: concentration time; storage coefficient; Nash model; spatial distribution of rainfall; coefficient of variation
요지
본 연구에서는 유역의 집중시간과 저류상수와 같은 유출특성의 결정에 호우사상을 선별하여 사용하는 것이 어느 정도 효과적인지를 평가하였다. 호우사상의 선별 기준으로 AMC 조건을 고려하였다. 즉, 각 호우사상들을 AMC 조건별로 구분하여 그 공간분포를 검토하고, 아울러 추정된 매개변수들도 AMC 조건별로 구분하여 분석함으로서, 유역 유출특성의 판단에 어떤 호우사상들을 사용하는 것이 적절한지가 제시될 수 있도록 하였다. 결론적으로 AMC-III 조건에 해당하는 호우사상을 이용하는 것이 유역의 유출특성을 결정하는데 보다 적절함을 확인할 수 있었다.
핵심용어: 집중시간; 저류상수; Nash 모형; 강우의 공간분포; 변동계수


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