雨水花园径流调蓄工况研究

发布时间：2019-02-15 18:34

【摘要】：城市发展进程中,大面积的道路建设改变了城镇原有地表径流路径和下渗过程,阻断地表雨水外泄路径,造成了洪涝灾害、水域污染和水生环境破坏等问题,雨水花园这种新型生态雨水综合利用系统能够充分的利用雨水资源,对地表雨洪起到滞留削峰的作用,实现雨洪就地下渗的最大化,防止了洪涝灾害的发生。论文选择了成都市某已建雨水花园系统的试验场地作为研究区域展开试验研究,分析雨水花园系统的雨水径流和下渗过程、雨水泄流水系结构,同步监测当地降雨量、雨水花园内储水液位变化情况。建立雨水花园系统模型,选择计算方法,确定运行控制参数,得出雨水花园系统的径流调蓄过程,对比分析不同降雨强度下模型计算与试验所测数据吻合情况,得出雨水花园系统的雨水径流削减率,评价雨水花园径流调蓄能力。主要取得了以下的研究成果:(1)建立了雨水花园系统径流调蓄过程的计算模型,分析雨水花园系统的运行过程,综合监测数据和模拟计算结果分析,验证了本试验雨水花园系统具有明显的雨水滞流调蓄功能,并且建立的模型针对降雨强度大、降雨历时相对较短的雨型与雨水花园实际试验系统拟合性较高,具有代表性,调蓄效果更明显。(2)选择了 6场拟合性较好的降雨,通过模型计算径流总量的削减效果来评价雨水花园系统的调蓄功能,总削减率范围为46.88%-85.24%,平均值为60.67%,最大值出现在7月22日,为85.24%。(3)由模型系统计算和工况分析结果可知,本研究中9场降雨汇流雨水峰值流量均未超过设计限值,则本试验雨水花园内部调蓄容积满足典型降雨径流调蓄需求,系统工况正常运行,系统设计稳定性较高。
[Abstract]:In the process of urban development, the road construction in a large area has changed the original surface runoff path and infiltration process of cities and towns, blocked the surface Rain Water leakage path, and caused problems such as flood disaster, water pollution and aquatic environment damage, etc. Rain Water Garden, a new ecological comprehensive utilization system, can make full use of Rain Water resources, play a role in peak reduction of surface rain flood, maximize the local infiltration of rain flood, and prevent the occurrence of flood disaster. In this paper, the experimental site of a built Rain Water garden system in Chengdu is selected as the experimental research area, and the runoff and infiltration process of Rain Water garden system is analyzed, and the drainage system structure of Rain Water is analyzed, and the local rainfall is monitored synchronously. Changes of water storage level in Rain Water garden. The Rain Water garden system model is established, the calculation method is selected, the operation control parameters are determined, and the runoff regulation and storage process of the Rain Water garden system is obtained. The model calculation under different rainfall intensity is compared with the experimental data. The runoff reduction rate of Rain Water garden system was obtained, and the runoff regulation capacity was evaluated. The main research achievements are as follows: (1) the calculation model of runoff regulation and storage process of Rain Water garden system is established, the running process of Rain Water garden system is analyzed, the comprehensive monitoring data and the result of simulation calculation are analyzed. It is verified that Rain Water garden system has obvious regulating and storing function of Rain Water, and the model established is more suitable and representative for the rainfall pattern with large rainfall intensity and relatively short rainfall duration than the actual experimental system of Rain Water garden. The effect of regulation and storage is more obvious. (2) six rainfall fields with good fit are selected to evaluate the regulation and storage function of Rain Water garden system by calculating the total runoff reduction effect by the model. The total reduction rate ranges from 46.88 to 85.24. The average value is 60.67 and the maximum value appears on July 22, which is 85.24. (3) from the results of model system calculation and condition analysis, it can be seen that Rain Water peak flow of 9 rainfall confluences in this study did not exceed the design limit. Therefore, the internal storage volume of Rain Water garden can meet the demand of typical rainfall runoff regulation and storage, the system operating condition is normal, and the system design stability is high.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU992;TU986

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