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Evaluation of River Flood Stability after River Restoration

하천 복원 후의 홍수위 안정성 검토

  • 김병찬 (국립한밭대학교 토목공학과) ;
  • 이종석 (국립한밭대학교 토목공학과)
  • Published : 2009.10.28

Abstract

The eco-friendly river restoration issue has been increased and the importance of the vegetation along the river banks has been understood with its scenery and significant role. However vegetation reduces the stream flow cross section and brings negative effects such as increase of water flow resistance and decreases of river flow velocity. In this study, the method to choose roughness coefficient is studied in the sudden changed hydraulic characteristics by river restoration. Using the HEC-RAS model and the two-dimensional vertical analysis method, Yangjae stream was calculated that the roughness coefficient of the main channel is 0.011~0.159 after river restoration, 0.031 without vegetation on the flood plain, and 0.034~0.506 with vegetation on the flood plain. The level of water in the river is predicted to rise 0.13~0.34m at 30% of vegetation density increase.

Keywords

River Restoration;Vegetation;HEC-RAS;Roughness Coefficient;Flood Stability

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