【摘要】 以在北京2012年"7·21"特大暴雨中受山洪灾害最为严重的房山区红螺谷小流域为研究对象,利用MIKE21HD建立平面二维水流数学模型,对大、中小型桥梁、漫水桥等跨河工程进行防洪影响研究。考虑建筑物设计标准、桥梁尺寸、结构、斜交角度、漫水桥高度等影响因素,分析跨河工程对河道水位、流速及淹没范围的影响。结果表明,跨河工程阻水作用明显,其中影响最大的是大型跨河桥梁,其次是漫水桥,中小型桥梁影响较小;跨河工程造成壅水、流速重分布,导致沟道淤积、冲刷,河水漫溢等。红螺谷小流域过流能力不满足山区河道10年一遇的防洪标准,需重新进行规划设计。更多还原

【Abstract】 Taking Hongluogu watershed in Fangshan District as an example,where is one of the worst-hit area caused by Beijing "7·21"rainstorm in 2012. The paper established a two dimensional water numerical model by MIKE21 HD,which is used to simulate the influence on flood-control by river-crossing engineering( large,medium and small bridges,submersible bridges). On the view of building design standards,bridges size and structure,skew angle,the height of submersible bridges and other factors,the model analyzed the effect on water level,flow and flooded area with the river-crossing engineering in different flood conditions. Firstly,the modeling results show that the water-blocking effect of river-crossing engineering is obvious,and the large crossing bridge may cause the greatest impact; the second is submersible bridges,the last is medium and small bridges. River-crossing engineering causes serious backwater and the velocity redistribution,which can lead to a channel siltation,erosion,bridges destroyed and flood overflow and so on. Finally,the conclusion is that the flow capacity of Hongluogu watershed flood control does not meet the standards of mountain river in ten years,and it is necessary to re-optimize the river layout.更多还原