复式河槽断面形态对综合糙率的影响

针对复式河槽的断面形态对称与否，对其综合糙率进行研究。根据大量的水槽试验进行整理分析，主要针对河槽几何形态以及相对水深比(hf/Hm)对复式河槽的影响拟合出综合糙率表达式。结果表明，在一定范围内，综合糙率随滩槽宽度比的增大而增大。并根据对比对称与非对称的计算结果，认为对称情况下的综合糙率比非对称情况下偏大。

Impact on composite roughness by cross-section morphology of compound channel

This paper did research on composite roughness in compound channels from the asymmetry and symmetry of cross-section morphology.Based on the analysis data from massive flume experiments and the influence on compound channel by channel geometry and relative water depth ratio(hf/Hm),this study developed a formula for composite roughness.From the results,it got that in a certain range,the composite roughness increases along with the increasing ratio of flood-plain width.Furthermore,through comparing the computational results when the cross-section morphology is symmetric with the computational results when the cross-section morphology is asymmetric,this research suggests that the composite roughness under the circumstance of symmetry is larger than that under the circumstance of symmetry.