Investigation of the Roughness Coefficient Effect on Open Channel Flow

With the effect of global warming in our world, rising sea levels, changing seasons and degrading the ecosystem can cause floods. Preventing floods requires good planning and projecting. The effect of roughness coefficient on open channel flow was investigated with this study. The purpose of the study is to examine the flow in the channel depending on the seasonal change of vegetation cover. This study was carried out on the Sarıhan river, which is located within Bayburt province borders. The flow was simulated using different roughness coefficients. In the study, ArcGIS and Hec-GeoRAS software were used to create a numerical model. HEC-RAS software was preferred to simulate open channel flow. The froude number, velocities in the cross section, the water level and the flow area have been seen to differences with the change of the roughness coefficient. In addition, for four different roughness coefficient values calculated in the study, critical flow rates that will cause flooding in any section of Sarıhan river were determined. In this study, the importance of roughness coefficient, which changes as a result of seasonal changes, was emphasized with this model.