Study of deposition of fine sediment within the pores of a coarse sediment bed stream  

作　　者：N.K.KHULLAR U.C.KOTHYARI K.G.Ranga RAJU 

机构地区：[1]Department of Civil Engineering,PAU Ludhiana-India Prof.,Dr. [2]Department of Civil Engineering,IIT Roorkee-India Prof.,Dr. [3]Department of Civil Engineering,IIT Roorkee-India Formerly Prof.,Dr.

出　　处：《International Journal of Sediment Research》2013年第2期210-219,共10页国际泥沙研究（英文版）

摘　　要：Elaborate experiments were performed in a 30 m long, 0.5 m deep and 0.2 m wide laboratory flume to study the process of infiltration of fine sediment into the pores of coarse sediment forming the channel bed material. Different concentrations of suspended load of fine sediment of size 0.064 mm were passed over the channel bed made up of three different types of coarse sediments; two uniform and one nonuniform. The proportion of fine sediment infiltrated into the pores of bed material for each equilibrium concentration of suspended load of fine sediment in the flow was studied during several experimental runs. The proportion of fine sediment within the pores of bed material increased with an increase in the equilibrium concentration of suspended load of fine sediment in the flow. This process continued till the pores within the coarse sediment bed were filled up to the capacity with the fine sediment transported by the flow in suspension. The theoretical value was identified for limit for maximum proportion of fine sediment that can be present within the pores of bed material. On further increase in the concentration of suspended load of fine sediment in the flow, deposition of fine sediment occurs on the surface of the flume bed in the form of ripples of the fine sediment. This condition is defined as ＂depositional condition＇. Experimental observations on these and related aspects are presented herein.Elaborate experiments were performed in a 30 m long, 0.5 m deep and 0.2 m wide laboratory flume to study the process of infiltration of fine sediment into the pores of coarse sediment forming the channel bed material. Different concentrations of suspended load of fine sediment of size 0.064 mm were passed over the channel bed made up of three different types of coarse sediments; two uniform and one nonuniform. The proportion of fine sediment infiltrated into the pores of bed material for each equilibrium concentration of suspended load of fine sediment in the flow was studied during several experimental runs. The proportion of fine sediment within the pores of bed material increased with an increase in the equilibrium concentration of suspended load of fine sediment in the flow. This process continued till the pores within the coarse sediment bed were filled up to the capacity with the fine sediment transported by the flow in suspension. The theoretical value was identified for limit for maximum proportion of fine sediment that can be present within the pores of bed material. On further increase in the concentration of suspended load of fine sediment in the flow, deposition of fine sediment occurs on the surface of the flume bed in the form of ripples of the fine sediment. This condition is defined as ＂depositional condition＇. Experimental observations on these and related aspects are presented herein.

关 键 词：Fine sediment Flume experiment Bed material Concentration of suspended sediment Depositioncondition 

分 类 号：P333.4[天文地球—水文科学]