基于水深平均模型的植被水流数值模拟  

Numerical study of the behavior of the vegetated channel flow

作　　者：槐文信[1] 杨水草[1] 杨中华[1] 李丹[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《深圳大学学报（理工版）》2012年第1期56-60,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(10972163);中央高校基本科研业务费专项资金资助项目(2104001)~~

摘　　要：针对有植被作用的渠道,将植被对水流的作用视为河床的附加阻力,推导出植被作用下河床等效曼宁阻力系数计算公式,考虑植被区与无植被区交界区域产生的二次流对植被区阻力的综合影响,引入影响系数对等效曼宁阻力系数计算公式进行修正.将修正后的公式用于水深平均模型,求解非对称复式断面和矩形断面局部有植被渠道的流速分布,计算结果与实验数据吻合,表明该模型可有效用于局部植被覆盖渠道的水流计算.有助深入了解植被水流结构.An effect of vegetation is as the additional resistance to the riverbed. A formula of equivalent Manning resistance coefficient for the open channel flow with vegetation was deduced in consideration of the secondary flow on the resistance of the vegetated area by an influence coefficient. The modified Manning formula was introduced to the water depth-averaged model to solve the non-symmetrical compound channel flow and rectangular channel flow. The computed velocities were in good agreement with the experiment data, indicating that the numerical model is valid for estimating the velocity distribution of the partially vegetated open channel. The results are useful for the cognition of the vegetation flow structure.

关 键 词：水利工程 植被渠道 等效曼宁阻力系数 二次流 水深平均模型 

分 类 号：TV131.4[水利工程—水力学及河流动力学]