Abstract
Flows with sediment deposition in horizontal pipe are categorized into three types: flow with stationary bed, flow with bed load and flow with sliding sediment layer. Then the flow resistance and sediment transport are discussed theoretically and experimentally, in which the area in cross section of pipe is divided into three sections: clear water section, bed load section and sliding section on pipe wall.
Hydraulic radius of clear water section for both pipe wall and surface of sediment layer, which is derived with the method of hydraulic radius division, is proved to be usefull for the estimation of flow resistance and shear stress on the surface of sediment layer with which bed load can be estimated.
The critical condition for the occurrence of slip flow of sediment layer is also proved to be explained by relationship between energy gradient and sediment layer thickness.
