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GIS 및 GCUH를 이용한 돌발홍수 경보발령기준우량 산정의 실유역 적용 연구 : 소백산 남천유역 중심 An Application of making the Flash Flood Warning Trigger Rainfall in Real Basin using GIS and GCUH -At the Namcheon Basin of the Sobaek Mountain-

논문 기본 정보

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대한토목학회 대한토목학회논문집 B 大韓土木學會論文集 제24권 제4 B호
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311 - 319 (9page)
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GIS 및 GCUH를 이용한 돌발홍수 경보발령기준우량 산정의 실유역 적용 연구 : 소백산 남천유역 중심
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    초록·키워드

    This paper is to make the flash flood warning trigger rainfall(FFWTR). It is based on the flash flood guidance(FFG). The difference is basin scale and threshold depth. This case is small scale basin and the threshold depth is not depth is overflowing bank but the depth is causing the loss of life. In this paper, the threshold depth is set to 0.5m and the channel discharge is computed using the Manning’s formula. And the decision of the FFWTR is computed by the geomorphoclimatic unit hydrograph(GCUH). First, the peak discharge of the GCUH is set to equal with the threshold discharge from the Manning’s formula. Effective Rainfall is calculated by using the geomorphologic instantaneous unit hydrograph(GIUH) parameters and digital terrain elevation data. Second, Total Rainfall is calculated by using the NRCS(Natural Resources Conservation Service) method with the total rainfall and effective rainfall. Third, the GCUH is decided by considering of the rainfall duration time and total rainfall at the given basin and rainfall event. The warning is announced when the basin average rainfall is larger than the FFWTR. At the Namcheon basin of the Sobaek mountain, when the threshold depth was set to 0.5 m, the threshold discharge was 10.28 m³/sec and the FFWTR was determined by about 9mm in the rainfall duration time, 20 minutes. This study provided the proper guidance of FFWTR to the small scale basin. Using of the geographic information system(GIS) and a series of programming enabled more rapid and efficient decision of the FFWTR.

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      UCI(KEPA) : I410-ECN-0101-2009-531-018554260