植被弯曲形态对水流的阻力效应研究  

Resistance Effect of Vegetation Bending Form to Water Flow

作　　者：李磊 王伟杰 董飞[2,3] 黄爱平 冯达骞[1] 徐宇轩 LI Lei;WANG Wei-jie;DONG Fei;HUANG Ai-ping;FENG Da-qian;XU Yu-xuan(School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China;Department of Water Ecology and Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Key Laboratory of Water Safety for Beijing-Tianjin-Hebei Region of Ministry of Water Resources,Beijing 100038,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056038 [2]中国水利水电科学研究院水生态环境研究所,北京100038 [3]水利部京津冀水安全保障重点实验室,北京100038 [4]华北水利水电大学水利学院,河南郑州450045

出　　处：《水电能源科学》2024年第4期72-75,共4页Water Resources and Power

基　　金：国家重点研发计划(2021YFC3200903);中国长江三峡集团有限公司科研项目(0704198);国家自然科学基金项目(51809286);中国水科院“五大人才”项目(WE0199A052021,WE0145C042023);水利部基本科研业务费项目(WE110145B0042023)。

摘　　要：植被化生态河道的阻力特性是环境水力学的研究热点之一。为探寻柔性植被不同弯曲倾角下的阻力特性,利用圆柱铝棒进行弯曲模拟柔性植被,并采用测力装置,对不同倾角状态下圆柱铝棒及流速范围开展室内水槽试验,首先研究直立圆柱铝棒阻力与流速之间的关系,得到的拖曳力系数Cd符合已有研究,同时验证了测力装置的可靠性;随后开展不同倾角下的植被阻力试验,得到Vogel数随着倾角的减小呈逐渐降低最后突增的趋势。当植被弯曲时,已有的刚性直立植被丛模型不再适用,通过引入与倾角相关参数Cθ对模型进行修正,显著提高了模拟精准度。研究结果可为生态植被化河道水力学精准模拟提供技术支撑。The resistance characteristics of vegetated ecological channel is one of the research focuses of environmental hydraulics.In order to explore the resistance characteristics of flexible vegetation under different bending angles,cylindrical aluminum rods were bent to simulate flexible vegetation.A force measuring device was used to carry out indoor flume experiments on cylindrical aluminum rods under different inclination angles and velocity range.Firstly,the relationship between the resistance and velocity of vertical cylindrical aluminum rods was studied,and the obtained dragging force coefficient Cd was consistent with previous studies.At the same time,the reliability of the force measuring device was verified.Then,experiments on vegetation resistance under different inclination angles were carried out,and it was found that the Vogel number gradually decreased with the decrease of inclination angle and finally increased abruptly.When the vegetation is bent,the existing rigid upright vegetation cluster model is no longer applicable.In this paper,parameters Cθre-lated to the inclination angle are introduced to modify the model,which significantly improves the simulation accuracy.The research results can provide technical for accurate simulation of ecological vegetated river hydraulics.

关 键 词：植被水流 弯曲度 Vogel数 拖曳力系数 

分 类 号：TV133[水利工程—水力学及河流动力学]