Evaluation of the Effect of Land Vegetation on Flood Cross Section in Open Channels

Authors : Esin Acar

Pages : 1022-1039

Doi:10.29130/dubited.1496571

View : 189 | Download : 141

Publication Date : 2025-07-31

Article Type : Research Paper

Abstract :Floods can occur effectively, especially in riverbeds defined as open channels, and can cause damage not only to the riverbed itself but also to the lands located on the right and left banks of the river. In this study, example riverbeds and floodplain areas were utilized. The areas exposed to flooding were planned with different vegetation types and defined by Manning roughness coefficients. By passing a determined flood discharge of Q=1000 m3/s through the river cross-section, areas susceptible to flooding were determined using the HEC-RAS program and the standard step method. The influence of vegetation diversity on flooding, the correlation between increasing roughness values and flooding, the acceleration of water velocity by dense vegetation, and the effects of changes in hydraulic radius across sections on flooding were calculated. Additionally, the effects of topographical variations and the selection of roughness coefficients using proper methods on flooding were demonstrated. Thus, the effects of vegetation type, topography, roughness, and hydraulic radius on flood sections were determined and evaluated for their significance.
Keywords : Açık kanallar, manning pürüzlülük katsayısı, taşkın, arazi vejetasyonu, HEC-RAS

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