基于复式断面河道水力特性的分区防护设计研究

Study on design of zoned protection based on hydraulic characteristics of compound channel

本文建立三维紊流数学模型,通过算例验证了其合理性。根据复式断面河道水力特性计算结果,从流速梯度和紊动能等方面分析了河道横向各区域水流冲刷特性。研究表明各区壁面附近冲刷强度存在明显差异,指出复式断面河道内,受主流影响较大的河道主槽区域和坡坎拐角等壁面区域是重点防护区域,进而提出复式断面河道分区防护的观点。

A 3 - D turbulence mathematical model is established herein, and then its reasonability verified through a rele- vant calculation case. In accordance with the calculation result of the hydraulic characteristics of the compound channel, the flowscouring characteristics of all the lateral zones of river channel are analyzed in the aspects of the flow-velocity gradient, turbulent kinetic energy, etc. The study shows that obvious differences are there near the surfaces of all the zones, thus, it is pointed out that the key protection zones within the compound channel are the surfaces of the main channel and the corner of the slope-ridge under larger impact of the main stream, furthermore, the concept of zoned protection for the compound channel is proposed as well.