Abstract
Manning's roughness coefficient is influenced by roughness condition of perimeter, shapes of longitudinal and cross sections, flow conditions represented by parameters such as the Reynolds Number and so on. There are few preceding studies dealing with relationship between the roughness coefficient and other factors than the roughness condition. The purpose of this study is to examine relationship between the Manning's overall roughness coefficient and configurations of river channels which have different roughness perimeters by numerical simulation. Characteristics of variations in the Manning's coefficient according to water depth and applicability of composite roughness coefficient are discussed.
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