水资源与水工程学报2023，Vol.34Issue(6)：69-78,10.DOI:10.11705/j.issn.1672-643X.2023.06.09
河道束窄段对上游洪水过程特性的影响
Influence of narrow river reach on flood hydraulic characteristics
摘要
Abstract
In order to study the influence of narrow river reaches on flood evolution,the two-dimensional all-hydrodynamic model GAST was used for numerical simulation,with which the quantitative relationship between the narrowing of the river reach and the flood hydraulic characteristics of the ideal river and Bahe River was analyzed.The results show that the influence of the narrow section shape on water depth and flow rate in the flood evolution process in decreasing order is:V-shaped,U-shaped,trapezoidal and rec-tangular.When the shape of the sections are the same,the greater the narrowing of the section,the dee-per the influence on water depth and velocity.The water level in the upstream of the narrow reach is higher than that in the downstream,but the velocity is on the opposite,so broadening the narrow reach can reduce the difference of water level and velocity between the upstream and downstream.Under the flood 8·19,the upstream water depth of the three working conditions(original narrowing degree is 64.4%,after dredging the narrowing degree of the three working conditions become 55.6%,46.7%and 37.8%)can be reduced to 0.669,0.985 and 1.066 m,and the flow velocity difference can be reduced by 0.702,1.592 and 2.550 m/s.When the flood volume increases,the water level and flow velocity of the river increase,so does the influence of narrow reach width change on water level and velocity.Under the three inflow conditions,the maximum water depth of the original reach is 2.177,2.778 and 3.618 m,and the maximum water depth is reduced to 1.866,2.367 and 3.175 m after increasing the narro-wing degree to 37.8%.The analysis of hydraulic characteristics of the narrow river reach with different narrowing degrees can provide a reference for the flood control of narrow river reaches.关键词
河道束窄段/洪水过程/水力要素/数值模型/灞河上游Key words
narrow reach/flood evolution/hydraulic characteristic/numerical model/the upstream of Bahe River分类
建筑与水利引用本文复制引用
董美君,侯精明,王添,马勇勇,张晔,张凡,谭显伦,杨磊,杨祎玲..河道束窄段对上游洪水过程特性的影响[J].水资源与水工程学报,2023,34(6):69-78,10.基金项目
国家自然科学基金项目(52009104、52079106) （52009104、52079106）
中德合作交流项目(M-0427) （M-0427）
陕西省科技创新团队项目(2020TD-023) （2020TD-023）
