基于植被粗糙度的生态渠道阻力系数研究  

Study on resistance coefficient of ecological channel based on vegetation roughness

作　　者：王伟杰 赵进勇[1] 冯达骞 彭文启[1] 刘晓波[1] 张晶[1] WANG Weijie;ZHAO Jinyong;FENG Daqian;PENG Wenqi;LIU Xiaobo;ZHANG Jing(China Institute of Water Resources and Hydropower Research,Beijing 100038,China;School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]中国水利水电科学研究院,北京100038 [2]河北工程大学水利水电学院,河北邯郸056038

出　　处：《中国水利水电科学研究院学报（中英文）》2023年第6期519-525,共7页Journal of China Institute of Water Resources and Hydropower Research

基　　金：水体污染与治理科技重大专项(2018ZX07105-002);水利部公益性行业科研专项(201501030);中国水科院十四五创新团队专项(WE0145B042021);中国水科院“五大人才计划”之基础研究型人才项目(WE0199A052021)。

摘　　要：天然渠道中遍布种类众多的水生植被,河道中的植被在改善水质、减少水土流失和生态修复中起到了重要作用,但同时也会产生阻力,影响河流流速的大小以及流量的分布。本文通过对植被化河道阻力系数进行理论分析,分析出相对粗糙度和阻力长度是影响植被阻力系数的两个关键因子。通过收集到的不同学者不同工况条件下刚性植被的实验数据,利用遗传算法获得植被阻力系数的计算公式。最后通过对比实验及验证组的实测数据与公式计算值,验证该公式对于计算植被阻力系数的精确性。结果表明:本文提出的植被化生态渠道的阻力系数公式相对简洁,模拟精度较高,为阻力系数公式在植被化渠道中的应用提供了参考,对植被化渠道的流量预测及生态修复提供了理论依据。The natural channels are full of various aquatic vegetation,which plays an important role in improving water quality,reducing soil and water loss and ecological restoration,but at the same time,it will also produce resistance,affecting the velocity of the river and the distribution of the discharge.Based on the theoretical analysis of the resistance coefficient of the vegetated channel,it is found that the relative roughness and the resistance length are the two key factors affecting the resistance coefficient of vegetation.Through the collected experimental data of rigid vegetation under different working conditions,the formula of vegetation resistance coefficient is obtained by using genetic algorithm.Finally,the accuracy of the formula for calculating the vegetation resistance coefficient was verified by comparing the measured data and the calculated values of the formula.The results show that the resistance coefficient formula of the vegetated ecological channel proposed in this paper is relatively simple and has high simulation accuracy,which provides both a reference for the application of the resistance coefficient formula in the vegetated ecological channel and a theoretical basis for the flow prediction and ecological restoration of the vegetated ecological channel.

关 键 词：植被河道 明渠流动 阻力系数 遗传算法 植被粗糙度 

分 类 号：TV213.4[水利工程—水文学及水资源]