退垸还湖防洪效应影响因素研究

退垸还湖是降低防洪压力的重要措施,不同的平退方式对防洪的影响是不同的.运用一维非恒定流数学模型研究概化河道及蓄滞洪区中退垸还湖对附近河道的防洪影响,总结退垸还湖对河道防洪影响的规律及退垸还湖时需要注意的问题,为退垸还湖的实际推行提供参考.结果表明,退垸还湖可以有效的起到蓄洪滞洪的作用,其中单退方式对控制站的水位降低作用比双退方式更为明显.单退情况下,防洪效应受到口门开启时间的影响,采用合理的调度方式,可以更加充分发挥垸区的蓄洪削峰作用.相比较而言,距离平退垸区比较近的水位站点受到的影响更大;上游与下游相比较,同样距离情况下,上游站点受到的影响相对大一些.因此,在退垸还湖过程中要充分考虑平退垸区及保护区域的相对位置、平退方式及垸区的调度方式等多方面因素.

Research on the Influence Factor on Flood Control Caused by Retreating the Flood Storage

The shrinkage of water area affects the ecological balance and the flood control badly, this not only threats the living of animals and plants, but also impairs the regulating ability of the lake and brings more pressure on flood control. Retreating the flood storage is necessary. For a long time, study of retreating the flood storage is focused on the flood control in the given regions, and the study about general principles is little. With one-dimensional unsteady flow mathematical model, the influence fa...