河道边界条件对河型形成影响的概化试验研究

Research on influence of river boundary condition upon pattern

河道比降、床沙组成是河道边界条件中影响河型形成的最主要因素。通过概化模型试验对河道比降和床沙组成影响河型形成的规律进行了深入的研究。研究成果表明,在其他初始条件一样的情况下,不同比降对河型形成影响较大,随着比降增大,河槽宽深比增加,河道向不稳定河型方向发展。同样,在其他初始条件一样的情况下,不同床沙组成对河型形成也有影响,随着床沙粒径变细,河槽宽深比增加,河道向不稳定河型方向发展。这与我国大江大河所显示的规律是一致的。

Stream gradient and bed sand constituent are the main factors which is influencing on river pattern formation in the boundary condition. Their law is deeply studied through a conceptual model test. The result shows that the different gradient has greater influence on river pattern formation under the circumstance of the same initial conditions.The ratio of width and depth of the river channel increases while the gradient is growing and the river pattern is becoming unstable.