滩地植被化复式河道水流运动特性研究  

Flow Features in a Compound Channel with Vegetated Floodplain

作　　者：赵汗青 王伟杰 朱志鹏 贾凤聪 李今今 赵彦芳 冯浩川 ZHAO Han-qing;WANG Wei-jie;ZHU Zhi-peng;JIA Feng-cong;LI Jin-jin;ZHAO Yan-fang;FENG Hao-chuan(China Three Gorges Corporation,Wuhan 430010,China;National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Nanjing 210024,China;State Key Laboratory of Simulation and Regulation of River Basin Water Cycle,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]中国长江三峡集团有限公司,湖北武汉430010 [2]水资源高效利用与工程安全国家工程研究中心,江苏南京210024 [3]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [4]华北水利水电大学水利学院,河南郑州450045 [5]河北工程大学水利水电学院,河北邯郸056038

出　　处：《水电能源科学》2022年第12期54-58,102,共6页Water Resources and Power

基　　金：中国长江三峡集团有限公司科研项目(202103399);国家自然科学基金项目(52209083,51809286)。

摘　　要：基于水槽试验与解析模型相结合的方法,采用仿真植被研究莎草和芦苇环境下复式河道的水流运动特点。考虑复杂形态植被阻力、横向动能交换、二次流系数和床面阻力等作用,建立了含植被复式河道水流控制方程,并得到了水深平均流速分布公式,通过试验数据验证了流速分布公式的有效性。结果表明,在相同水深条件下,当等效孔隙率增加,主槽和边坡区二次流系数基本不变,边滩植被区的二次流系数减小;同等试验条件下,芦苇区二次流系数波动小,莎草区反之,说明边滩植被形态越复杂,二次流系数在边滩植被区的波动越大;提出的流速分布模型既适用于植被形态沿垂向恒定,也适用于植被形态沿垂向变化的情景,在应用于后者条件时,需采用“等效挡水宽度”以综合反映植被的形态。Based on the method of flume experiment and analytical model,this paper studies the characteristics of water flow in compound channel under the environment of sedge and reed by using simulated vegetation.Considering the effects of complex vegetation resistance,transverse kinetic energy exchange,secondary flow coefficient and bed resistance,the flow control equation of complex river with vegetation was established,and the formula of average velocity distribution in water depth was obtained.The effectiveness of the formula was verified by experimental data.The results show that under the same water depth,with increase of equivalent porosity ratio,the secondary flow coefficient in the vegetation area decreases,and the secondary flow coefficient in the main channel and slope area are basically the same;Under the same test conditions,fluctuation of the secondary flow coefficient in reed area is smaller and vice versa in sedge area,indicating that the morphology of beach vegetation is more complex,the fluctuation of the secondary flow coefficient is larger.The proposed velocity distribution model is suitable for both the constant and the changing of vegetation morphology along the vertical direction;When applied to the latter condition,equivalent water retaining width should be adopted to reflect the morphology of vegetation comprehensively.

关 键 词：仿真植被 复式河道 流速分布公式 二次流 等效挡水宽度 

分 类 号：TV131.2[水利工程—水力学及河流动力学]