含植被河道水流阻力系数试验研究

河道植被生态特征的多样性和水流运动的复杂性造成的水流阻力难以预估,生态型河道防洪能力计算存在困难。通过对含植被河道水流阻力系数试验及研究成果的回顾,梳理已有的研究方法、研究内容和相应结论,分析阻力系数的影响因素和计算取值,提出尚需进一步加强的技术途径和开展的研究方向:含植被河道模型试验的技术手段尚需改进,在强化植被层中紊流涡旋运动观测分析的基础上,加强对植被层水流阻力的机理研究;须针对植物随机生长和种群分布特点,加强对植被生态特征与水流阻力关系的研究,并进一步优化植被与河床共同作用下水流阻力的计算方法。

Experimental study on flow resistance coefficient of vegetated channel

Due to the diversity of ecological characteristics and the complexity of flow movement,it is difficult to estimate the flow resistance in vegetated channels and to calculate the flood control capacity of ecological channels.Based on the review of flow resistance coefficient test and research result,we summarize the existing research methods,research contents and corresponding conclusions of vegetated channels,analyze the influential factors of the calculation methods of the resistance coefficient,and propose the technical approaches of vegetated channels model test to be improved.The mechanism investigation of flow resistance induced by vegetation should be strengthened by observing the turbulence characteristics in the vegetated layer.The study on the relationship between ecological characteristics of vegetation and flow resistance should be strengthened according to the vegetation characteristics of random growth and population distribution.The calculation methods of flow resistance under the combined action of vegetation and riverbed should be further optimized.