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在小流域淤地坝系中,有些骨干工程需设置溢洪道,以防止洪水漫顶,保证骨干工程及其下游淤地坝的安全。 一、溢洪道的位置选择 溢洪道的位置,应根据坝址的地形、地质条件并进行技术经济比较来选定。 坝址区的天然马鞍形山垭口,若高程与骨干工程设计洪水位相差不多,而垭口后面又有天然冲谷,并在大坝下游一定距离处与原沟道相连,这样的地形条件是布置溢洪道的良好位置,如图6—1.
In the dam system of small valleys, some key projects need to set up spillways to prevent flooding and ensure the safety of key projects and silt dams downstream. First, the location of spillway Select the location of spillway, dam site should be based on the topography, geological conditions and technical and economic comparison to be selected. The natural saddle-shaped mountain pass in the dam site, if the elevation is similar to the design flood level of the backbone engineering and the natural valley behind the pass and connected with the original trench at a certain distance downstream of the dam, the terrain condition is to arrange the spillway Good location, as shown in Figure 6-1.