柔性淹没植被对生态河道洪水波影响研究  

Study on influence of submerged flexible vegetation on propagation of flood waves in ecological river

作　　者：槐文信[1] 唐雪[1] 王伟杰[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《华中科技大学学报（自然科学版）》2016年第4期111-115,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51439007;11172218;11372232);高等学校博士学科点专项科研基金资助项目(20130141110016)

摘　　要：为了研究生态河道中的植被对河道水流产生的阻力问题,分析了糙率与平均流速、水深、植被密度之间的关系,总结出柔性淹没植被情况下的糙率公式,并通过数值计算求解一维圣维南方程,从流量、水位、流速三个方面来分析柔性植被对洪水波传播的影响.研究结果表明:植被的存在虽然会增大河床糙率,但当水位和流速增大时,植被对糙率的影响会降低;从糙率对洪水波影响来看,若糙率越大,则流量、流速越小,水位越高.To study the problem of flow resistance generated in ecological river,relationship between the Manning′s n-value and depth-averaged velocity,water depth as well as vegetation density was analyzed,and then a derived Manning′s equation associated with flow condition and vegetation attribute was proposed.By solving classic Saint-Venant Equations,the impact of submerged flexible vegetation on flood waves was analyzed from discharge,water level,and depth-averaged velocity.Results demonstrate that although the presence of vegetation increases the bed roughness,the influence of vegetation on flow resistance will be reduced when increasing water level and flow velocity.From another point of view,the impact of vegetation roughness on flood wave shows that when increasing flow roughness,flow rate and velocity will decrease while water level increases.

关 键 词：明渠流动 柔性淹没植被 水流阻力 糙率 洪水波 

分 类 号：TV133.2[水利工程—水力学及河流动力学]