软体排护滩带的护滩效果研究

长江中下游心滩河段水沙运动规律较为复杂,碍航问题也较为突出。为了改变这种现状,可采用护心滩建筑物对心滩进行守护,以达到恢复和改善航道条件的目的。以长江中游典型碍航心滩河段——沙市三八滩河段为原型,进行了心滩采用软体排护滩带守护的概化模型试验,结合理论分析,详细论述了软体排护滩前后心滩和河床的冲刷变化规律以及软体排护滩带对汊道分流分沙比的影响。给出了水流挟沙力和动床阻力在心滩河段汊道及滩上的沿程变化规律。对心滩守护前后的水流挟沙力和动床阻力进行了对比分析,并对软体排护滩的整体效果进行了总结。

Beach protection with flexible mattress beach protection belt

The movement regularity of the water and sediment in the middle reach of the central bar of Yangtze River is very complex.Especially,the navigation problems are prominent.With the aim of changing and improving the channel conditions,the beach protection constructions can be used to protect the central bar.Based on the typical reach of the central bar the Sanba beach of Shashi,experiment of the flume generalized model is carried out.And with the aid of generalized physical model experiment and through theoretical analysis,the central bar and riverbed scouring deformation regularity are discussed in detail when the central bar is protected or not by the flexible mattress and the effect which contributes to the partition ratio of sand content and flow of the braided reach.The regularity along flow path of the sediment-carrying capacity of flow and the movable bed resistance on the bar is presented and compared.The advantages and disadvantages of the central bar protected by the flexible mattress are analyzed as well.