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由城市化带来的水问题说明城市雨洪调控和建设海绵城市的重要性。运用暴雨洪水管理模型(SWMM)构建模型,模拟分析研究区天然状态、城市化后无调控措施和添加生物滞留池调控三种情景下水文指标的变化情况和相应的水文效应,并通过改变生物滞留池的表层厚度模拟径流参数的变化。结果表明,生物滞留池能有效减小径流、削减洪峰、延迟出口流量过程出现的时间,且对小降雨事件的调控性能显著;改变生物滞留池的表层厚度对下渗几乎无影响,随着表层厚度的增大表面出流和径流系数都减小,而对出口流量过程影响不大,因此可以提高生物滞留池的面积比例或其他措施共同调控城市的径流。
The water problems caused by urbanization illustrate the importance of urban storm flood control and the construction of a sponge city. The storm flood management model (SWMM) was used to construct a model to simulate and analyze the changes of hydrological indexes and the corresponding hydrological effects under the natural conditions of the study area, no regulation after urbanization and the regulation of adding biological retention pool. By changing the biological retention Surface pool thickness simulates changes in runoff parameters. The results show that the bioretention pool can effectively reduce the runoff, reduce the flood peak, delay the exit flow time, and control the performance of small rainfall events significantly. Changing the surface layer thickness of bioretention pool has little effect on the infiltration, Increasing the thickness of the surface outflow and runoff coefficient are reduced, while the discharge flow process has little effect, so you can increase the proportion of biological retention pool area or other measures to jointly control urban runoff.