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Journal of the Korean Society of Hazard Mitigation 2007;7(2):65-71.
Published online June 30, 2007.
하천 만곡률과 홍수량에 따른 수면경사도 산정
최한규, 이문희, 백효선, 박수진
Estimation of the Water Surface Slope by the River Bend Curvature and Flood Discharge
Han-Kuy Choi, Mun-Hee Lee, Hyo-Sun Baek, Soo-Jin Park
Abstract
In this research, we made a one and two-dimensional analysis of numerical data collected from the bend curvature of a bended river section. According to the result from the numerical analysis, the inflow & output angle caused a water level deviation which increased with an increase of the flood discharge. From the water level deviation of our two-dimensional numerical model, we obtained the maximum slope of 6,67% when the inflow and output angle was 105 degrees and the flood discharge was 500 CMS. As for the right side, the differences with the one-dimensional numerical model were reduced when the angle was more than $90^{circ}$. As for the left side the differences were reduced when the angle was more than $105^{circ}$. For a river with more than 90 degrees bend curvature, a hydraulic experiment would be more appropriate than a numerical analysis.
Key Words: numerical analysis; flood discharge; water level; water surface slope; river bend curvature; hydraulic model experiment
요지
본 연구는 만곡하천의 단면을 만곡률에 따라 1 2차원 수치해석을 실시하였다. 수치해석 결과 유 출입각에 따른 수위 편차가 발생하였으며, 홍수량 변동에 따른 편차가 증가하였다. 2차원 수치모형에 의한 수위편차를 보면 유 출입각 105도 일 때 홍수량 500CMS에서 최대경사가 6.67%가 나타났다. 우측은 90도를 초과하는 경우 1차원 수치모형과의 편차가 감소하였으며, 좌측의 수위는 105도를 초과하는 경우 1차원 수치모형과의 편차가 감소하는 것을 확인하였다. 이는 90도 이상의 만곡하천의 경우 수치해석보다는 수리모형실험을 통하여 검증하는 것이 바람직하겠다.
핵심용어: 수치해석; 홍수량; 수위; 수면경사; 만곡하천; 수리모형실험
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