筲箕背卵石急滩碍航特征以及卵石沙波形态分析

根据筲箕背滩的多年实测资料、现场踏勘资料，结合历年整治方案，分析筲箕背滩卵石沙波形态以及碍航特征。分析表明：1996年整治方案实施后，练家槽上段的“浅”得到了治理，中段的“急”得到了缓解，下段弯险的碍航特征还比较突出；筲箕背滩卵石运动强烈，卵石呈三维沙波形式向下游输移；扯船槽、新槽、老槽目前为卵石沙波的波谷，但极有可能发展成波峰；卵石沙波运动较为缓慢；练家槽以上的主航槽较为稳定。练家槽是筲箕背卵石沙波向鹭鸶碛输移的主要通道，其地形变化较大。

Analysis of Pebble Ripples and Riverbed Development of Shaojibei Rapids in the Yangtze River

The pebble ripples and riverbed development of Shaojibei rapids were analyzed based on the measured data,the explorative data,and the regulation projects of past years.The analyzing result reveals that after the regulation project implemented in 1996,the shallow part of the upper reach of Lianjia groove was deepened,the rapid flow of the middle part was controlled,but the navigation-obstruction flow pattern of the lower reach remained still obvious;The intensity of the pebble ripples of Shaojibei rapids is big,and the pebble ripples move downward with three-dimensional ripple.The pebble ripples of Chechuan groove,new groove,and old groove are wave trough,but they likely develop to wave crest.The movement speed of the pebble ripples is slow;River bed change of the upper part of Lianjia groove is small,and Lianjia groove is the main passage of the pebble ripples' movement.