NUMERICAL MODELING THE DIMINUTION OF TRANSVERSE SECTION OF A SEWER PIPE FOR SEDIMENTS TRANSPORTED AS BED LOAD

摘要

Sewer pipes designed to transport stormwater and domestic wastewater are suspect to form deposits at the pipe invert. The main problems caused by deposits are: diminution of flow capacity, augmentation of roughness and surcharging during storm events. In order to manage the effects of deposits an important parameter is the percentage of the cross section of the sewer which is reduced by the presence of the solids. A mathematical model based on the continuity equations, expressions for particle fall velocity, particle velocity and transport capacity of the sewer was numerically solved using Matlab and indicate the variation of sediment layer thickness on the pipe bed.