한국방재학회:학술대회논문집
- 한국방재학회 2008년도 정기총회 및 학술발표대회
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- Pages.401-404
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- 2008
개수로내 식생에 의한 Manning계수의 변화
Variation of Manning's Coefficient due to Vegetation in Open Channel
- 발행 : 2008.02.28
초록
The vegetation in the surrounding area of river is a primary factor to increase water level during flood. The influence of vegetation on the river flow in a bank has been investigated by using a hydraulic experiment. For a hydraulic experiment square-shaped piers are used as a model of unsubmerged rigid vegetation in a open channel. For fully developed uniform flows, the water elevation of the experiment was measured as varying the interval of piers and the porosity which presents the fraction of water flowing area in the cross-sectional area. The Manning's roughness coefficient, which implicates energy losses due to the vegetation, was obtained by using the experimental data. As a result, the energy losses were varied when the distance of piers and the porosity of area were changed, and the Manning's coefficient increased nonlinearly when a water elevation increased.