基于SWMM模型的宿迁市排水系统模拟评价

发布时间：2018-12-25 16:46

【摘要】：本文以宿迁市马陵河片区排水系统为研究对象,总结了目前国内外城市排水管网模型的研究现状,选取SWMM作为研究模型,利用ArcGIS的数据处理和空间分析功能,研究划分子汇水区域；在对当地管网信息收集、整理、分析的基础上,对管网进行了概化：根据实测数据完成了参数率定,构建了宿迁市马陵河片区排水管网系统模型,并对当地排水系统进行了水力、水质模拟。主要结论如下：(1)对SWMM模型的原理进行了分析与研究,明确了SWMM对输入参数的要求,结合ArcGIS的数据处理功能和空间分析功能获得所需数据,大大减少了模型建立的工作量；根据实测数据完成了参数率定；根据由芝加哥降雨合成线设计的降雨,完成了当地排水管网系统水文、水力和水质的模拟。(2)分析了不同降雨强度下研究区域降雨量、入渗量与径流量之间的关系,径流量与降雨强度有很强的相关性,降雨强度越大,径流量越高,不同重现期降雨条件下,系统的径流排放峰值分别为36m3/s,30.4m3/s,71.8m3/s,112.9m3/s, 169.9m3/s,213.4m3/s,257.3m3/s,径流量的峰值到达时间比降雨强度的峰值到达时间迟滞9-14min。并对管网积水情况进行模拟,分析了管网易积水节点的积水时间与积水深度。(3)分析了不同降雨强度下研究区域污染物的冲刷规律,入河非点源污染物总量随降雨强度的增加而增加,污染物的排放在降雨开始后45-50min后达到峰值,入河污染物体现了明显的初期效应,25%的水量(体积分数)冲刷的污染物占污染物总量的35%-50%。(4)通过管道优化和管道清淤等解决系统中出现的积水问题,改进后在重现期2年1遇降雨条件下系统基本无积水出现,可以指导城市防洪排涝中管网的设计；通过设置合理的调蓄池来解决部分子汇水区的非点源污染问题,模拟结果表明设置合理的雨水调蓄池能削减超过90%的径流峰值和90%以上的由初期径流带来的污染负荷,并且通过SWMM模拟能够指导调蓄池的设计。
[Abstract]:This paper takes the drainage system of the Maling River region of Suqian City as the research object, summarizes the present research situation of the urban drainage network model at home and abroad, selects SWMM as the research model, and utilizes the data processing and spatial analysis function of ArcGIS. To study the division of sub-catchment area; Based on the collection, arrangement and analysis of the local pipe network information, the pipe network is generalized. According to the measured data, the parameter rate determination is completed, and the drainage pipe network system model in the Maling River region of Suqian City is constructed. The hydraulic and water quality of the local drainage system was simulated. The main conclusions are as follows: (1) the principle of SWMM model is analyzed and studied, and the requirements of SWMM for input parameters are clarified. The required data are obtained by combining the data processing function and spatial analysis function of ArcGIS, and the workload of model establishment is greatly reduced. The parameter rate is determined according to the measured data. According to the rainfall designed by the synthetic rainfall line of Chicago, the hydrological, hydraulic and water quality simulation of the local drainage network system is completed. (2) the relationship among rainfall, infiltration and runoff in the study area under different rainfall intensity is analyzed. There is a strong correlation between runoff and rainfall intensity. The higher the rainfall intensity, the higher the runoff flow. Under the rainfall conditions of different recurrence periods, the peak runoff discharge of the system is 36 m3 / s0 30.4 m3 / s0 71.8 m3 / s / s ~ 112.9 m3 / s, respectively. The peak arrival time of runoff is delayed by 9-14 minutes compared with the peak arrival time of rainfall intensity. The water accumulation in pipe network is simulated, and the time and depth of water accumulation are analyzed. (3) the erosion law of pollutants in the study area under different rainfall intensity is analyzed. The total amount of non-point source pollutants increased with the increase of rainfall intensity, and the discharge of pollutants reached the peak after the rainfall began, and the pollutants into the river showed obvious initial effect. 25% of the water volume (volume fraction) of the pollutants scoured is 35-50% of the total amount of pollutants. (4) solving the problem of stagnant water in the system through pipeline optimization and pipeline silt cleaning, etc. After the improvement, there is no water in the system under the condition of rainfall in the recurrence period of 2 years, which can guide the design of the pipe network in urban flood control and drainage. In order to solve the problem of non-point source pollution in some sub-catchment area by setting up reasonable storage pool, the simulation results show that setting reasonable Rain Water storage pool can reduce the runoff peak value by more than 90% and the pollution load caused by initial runoff by more than 90%. And the design of the storage tank can be guided by SWMM simulation.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU992

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