%0 Journal Article
%A ZHANG Jing
%A WANG Dong
%A SHI Hao-ran
%A LIU Xiao-qing
%A YANG Yao
%T Experimental Study on Influence of Deposit on Cross-sectionalVelocity Distribution of Channel
%D 2018
%R 10.11988/ckyyb.20161138
%J Journal of Changjiang River Scientific Research Institute
%P 68-72
%V 35
%N 2
%X Deposits induced by huge landslide or debris flow are of big  size, hence changing the  cross-sectional velocity distribution of channel to a large extent. The aim of this research is to analyze the influence of  deposit on the velocity distribution of channel. According to 16 groups of flume experiments (10 on flume bed with gentle slope and 6 on steep slope),  the uneven cross-sectional velocity distributions along flow direction caused by different deposit size under gentle slope and steep slope conditions are obtained,  and the  correction factor of kinetic energy <i>α</i> and the cross-sectional velocity distribution are analyzed. Results show that  <i>α </i>  well represents the velocity uniformity of cross section. As blockage ratio of deposit increases, velocity distribution becomes more uneven. In particular, as for the channel with gentle slope, velocity distribution reaches the most uneven state at the postion when <i>x</i>/<i>l</i>=0.5; therefore  more distance from the upstream of the channel is needed to eliminate deposit’s influence on velocity distribution; whereas for the channel with steep slope, the position with uneven change of velocity distribution is mainly located at the deposit  reach, and the peak   correction factor of kinetic energy is obviously lower than that of the channel with gentle slope, which has less impact on the upstream and downstream.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20161138