Incipient motion of cohesionless sediments on riverbanks with ground water injection  

作　　者：Yan LU Yong-jun LU Yee-meng CHIEW 

机构地区：[1]Nanjing Hydraulic Research Institute,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering [2]School of Civil and Environmental Engineering,Nanyang Technological Univ.

出　　处：《International Journal of Sediment Research》2012年第1期111-119,共9页国际泥沙研究（英文版）

基　　金：supported by the National Basic Research 973 Program of China(Grant No. 2012CB417002);the National Natural Science Foundation of China(Grant No.50779037,50879047);the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Ministry of Personnel

摘　　要：This study investigates the influence of ground water injection on the initial movement of non-cohesive sediment particles on a riverbank slope analytically and experimentally. By including the hydraulic gradient in the force analysis, the critical condition was derived to account for the effect of seepage flow, showing that the seepage hydraulic gradient and the riverbank slope are governing parameters in modifying the incipient motion of sediments on a riverbank slope. Experimental investigations were performed in an open-channel flume for various riverbank slopes and hydraulic gradients of injection, showing that the critical shear stress increases with decreasing riverbank slopes and vise-versa, while injection reduces the critical value. All experimental data agree well with the theoretical derived expression of the critical condition in the case of injection.This study investigates the influence of ground water injection on the initial movement of non-cohesive sediment particles on a riverbank slope analytically and experimentally. By including the hydraulic gradient in the force analysis, the critical condition was derived to account for the effect of seepage flow, showing that the seepage hydraulic gradient and the riverbank slope are governing parameters in modifying the incipient motion of sediments on a riverbank slope. Experimental investigations were performed in an open-channel flume for various riverbank slopes and hydraulic gradients of injection, showing that the critical shear stress increases with decreasing riverbank slopes and vise-versa, while injection reduces the critical value. All experimental data agree well with the theoretical derived expression of the critical condition in the case of injection.

关 键 词：Incipient motion RIVERBANK INJECTION SEDIMENT SEEPAGE 

分 类 号：TV148[水利工程—水力学及河流动力学]