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Journal of the Korean Society of Hazard Mitigation 2015;15(1):281-289.
Published online February 28, 2015.
Shot-Noise 개념을 이용한 Clark 단위도의 변형 및 평가
유철상, 윤성현, 구정모
Use of Shot-Noise Concept for Changing Clark UH and Its Evaluation
Chulsang Yoo, Sunghyun Youn, Jung Mo Ku
Abstract
This study examined the Clark unit hydrograph (UH), and proposed a spatially-variable Clark UH by considering the concept of shot noise. The spatially-variable Clark UH is distinguished from the conventional Clark UH from the fact that it is derived by applying the linear reservoir first and the linear channel later. Also, the storage coefficient is differently assigned to be proportional to the distance from the basin outlet. The proposed spatially-variable Clark UH was applied to the Sanganmi basin for the rainfall-runoff analysis, whose results has also been compared to those of the conventional Clark UH. Summarizing the results are as follows. (1) The spatially-variable Clark UH with the same storage coefficient was found to be identical to the conventional Clark UH. (2) The spatially-variable Clark UH was found to have higher runoff peak and shorter peak time than those of the conventional Clark UH. (3) In the application to the Sanganmi basin, it could not be concluded that the spatially-variable Clark UH is superior to the conventional Clark UH. More applications to various basin should be done to reach any solid conclusions.
Key Words: Clark UH; concentration time; storage coefficient; shot noise; time-area curve
요지
본 연구에서는 Clark 단위도의 특성을 다시 살펴보고, shot noise의 개념을 이용하여 변형된 형태의 공간-변동 Clark 단위도를 제안하였다. 공간-변동 Clark 단위도의 가장 큰 특징은 기존 Clark 단위도와는 반대로 선형저수지를 먼저, 선형하천을 나중에 적용하여 단위도를 유도한다는데 있다. 또한 거리에 비례하여 저류상수를 달리 적용한다는 차이가 있다. 제안된 공간-변동 Clark 단위도는 상안미 유역에 적용하여 유출해석을 수행하였으며, 기존 Clark 단위도를 적용한 결과와 비교하였다. 그 결과를 정리하면 다음과 같다. (1) 저류상수를 일정하게 가정한 공간-변동 Clark 단위도는 기존 Clark 단위도와 정확히 일치하는 것으로 나타났다. (2) 저류상수를 거리에 비례하게 결정한 공간-변동 Clark 단위도는 Clark 단위도에 비해 첨두유량은 약간 더 크고, 첨두시간은 약간 짧은 형태를 가짐을 확인하였다. (3) 공간-변동 Clark 단위도와 Clark 단위도를 상안미 유역에 적용한 결과에서는 어느 한 단위도의 우위를 판단하기 어려웠으며, 보다 다양한 유역에 적용이 필요한 것으로 나타났다.
핵심용어: Clark 단위도; 집중시간; 저류상수; 시간-면적곡선
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