不均匀斑状糙率分布下河道水流数值模拟  

Numerical simulation of water flow with uneven patchy distribution of roughness

作　　者：周志华[1] 余明辉[2] ZHOU Zhihua;YU Minghui(Tianjin Water Conservancy Science Research Institute,Tianjin 300061,China;Wuhan University,College of Water Conservancy and Hydroelectric Power,Wuhan 430072,China)

机构地区：[1]天津市水利科学研究院,天津300061 [2]武汉大学水利水电学院,武汉430072

出　　处：《水科学与工程技术》2023年第4期9-12,共4页Water Sciences and Engineering Technology

摘　　要：针对行洪河道滩地陆生(水生)植物不均匀分布特点,提出河道水生植物斑状综合糙率赋值方法,运用该方法结合二维水动力数值模拟,计算分析独流减河生态工程实施前后河道行洪能力的变化,验证该方法可行性。结果表明:水生态修复工程建设会壅高河道洪水位,导致河道行洪能力降低,其影响程度和生态修复工程覆盖面积相关,对上游影响比下游大。独流减河设计洪水条件下水位最大壅高值为0.066 m,发生在河道进口段;流速最大降低0.04 m/s,发生在沉水植物补种区。According to the characteristics of non-uniform distribution of aquatic plants in floodplain of flood channel,this paper proposed a method for evaluating the variegated roughness of aquatic plants.Using this method and two-dimensional hydrodynamic numerical simulation,the variation of flood discharge capacity of the river before and after the implementation of Duliujian River was calculated and analyzed,and the feasibility of this method is verified.The results showed that the construction of aquatic ecological restoration project will hold up the flood level of the river channel,resulting in the reduction of the flood carrying capacity of the river channel.The degree of impact was related to the area covered by the ecological restoration project,and the impact on the upstream was greater than that on the downstream.Under the design flood conditions of the Duliujian River,the maximum backwater level was 0.066 m,which occurred at the river entrance section;the maximum flow velocity decreased by 0.04 m/s,which occurred in the submerged plant replanting area.

关 键 词：水生植物 斑状糙率 水动力模型 数值模拟 

分 类 号：TV131[水利工程—水力学及河流动力学]