Author(s): Kwang Ik Son; K. H. Kim; S. Jang; M. C. Kim; H. J. Kim
Linked Author(s): Hyeon-ju Kim
Keywords: Non-cohesive Sediment transport; Sediments load; Sediment deposit; Sewer-line
Abstract: Sediments often cause deterioration of water quality in a storm sewer line. Especially sediment deposition in a sewer line sometimes causes severe flood inundation in an urban area. Traditionally, a minimum velocity or shear stress was used in sewer line design to ensure deposition-free in Korean sewer line system. But many drainage systems had suffered malfunction due to the deposition of sediments last decades. In this research, non-cohesive sediment transport characteristics in a circular full-pipe flow were examined in a laboratory scale test. The experiments had been carried out with plastic pipe 60 mm-diameter and 8 meter-long, Non-cohesive solids were fed by sediment feeder from upstream of pipeline. The pipe was laid in horizontal and a gate valve was attached at the end of pipe to ensure the pipe is always full. The preliminary experiments showed that the sediment transport patterns in a circular pipe could be classified in four types. The transport patterns could be different with the incoming sediment load even if the water flow rates are the same. That is, the sediment transport is not only governed by critical movement condition of sediment particles but also the incoming sediment flow rate from upstream. Therefore, additional experiments had been carried out to define the governing parameters and to develop a sediment load estimation method in a sewer line. Governing parameters of sediment load per unit width were found. It is expected that the results of this research could be applied in sewer line design to avoid the sediment deposition.
Year: 2010