基于参数实测率定的多模式雨水系统的建模与应用

发布时间：2018-03-16 05:02

本文选题：SWMM　切入点：鸿业市政管线　出处：《青岛理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着城市的开发,城市的不透水下垫面比例增大,使得径流量明显增大,洪涝灾害问题严重,同时老城区合流制排水系统的改造十分困难;另外,由于绿化性质的土地减少,截留净化有机物的能力减弱,雨水冲刷地面会携带大量污染物质,直接溢流进入河道,严重污染河流。因此,提倡新型的雨水管理理念成为人们当务之急,新型的雨水管理模式既能减少改造老城区又能减少新城区修建雨水管网造价,于是“低影响开发(LID)”这种新型雨水管理理念被人们提出。本文以J市新城区雨水管网系统为背景,借助鸿业市政管线9.0快速导入SWMM的方式,建立了现状模型、常规开发模型、加入雨水花园开发模型、加入透水铺装开发模型和组合LID开发模型。模型准确性的关键在于参数率定。本文采用实测3场不同级别的降雨来进行模拟率定,利用扰动分析法对水文和水质模块进行参数灵敏度分析。结果表明:在水文方面,对SWMM模型峰值流量最敏感的参数依次是N-imperv(不透水区曼宁系数),Des-imperv(不透水区洼地蓄水深度)和Des-perv(透水区洼地蓄水深度);在水质方面,对于污染物积累模块,排放口排放COD峰值浓度最敏感的参数依次是道路最大累积量,道路速率常数,屋面最大累积量和屋面速率常数。运用SWMM对现状模型、常规开发建设模型以及低影响开发建设模型进行模拟对比,研究不同模型的雨洪控制效果和水质变化。结果表明:(1)常规开发模型的径流系数、洪峰流量、超负荷的检查井和管道数及有机物排放量较现状都增大;(2)低影响开发建设模型的径流系数、洪峰流量、超负荷的检查井、管段数及有机物排放量较现状和常规模型都有所降低;(3)通过对不同低影响开发模型的控制效果分析比较,得出结论:组合LID透水铺装雨水花园;(4)降雨强度越大,低影响开发模型有机物排放量的峰值出现越早且越大,控制好初期雨水并进行有效处理成为低影响开发模式的重要研究方向。(5)在经济社会效益方面,LID措施比常规开发改造方案有很大优势。本课题的研究对于J市新城区雨水管网改造提供了技术参考,为J市海绵城市建设提供了一定的理论依据。
[Abstract]:With the development of the city, the proportion of impermeable underlying surface of the city increases, which makes the runoff obviously increase, the flood disaster is serious, at the same time, it is very difficult to transform the drainage system of the combined flow system in the old urban area. In addition, because of the decrease of the land of greening nature, The ability of intercepting and purifying organic matter is weakened, Rain Water scour the ground will carry a large amount of pollutants, overflow directly into the river, seriously pollute the river. Therefore, it is urgent to advocate a new concept of Rain Water management. The new management mode of Rain Water can not only reduce the cost of rebuilding the old urban area but also reduce the construction cost of the rainwater pipe network in the new urban area, so the new concept of "low impact development LID-" has been put forward by people. The background of this paper is the rainwater pipe network system in the new urban area of J city. With the help of Hongye municipal pipeline 9.0 to quickly import SWMM, the present situation model, conventional development model and Rain Water garden development model are established. The key to the accuracy of the model is the determination of the parameter rate. In this paper, the simulated rate is determined by using the measured rainfall of three different levels, and adding the permeable pavement development model and the combined LID development model, the key to the accuracy of the model lies in the parameter rate determination. The parameter sensitivity analysis of hydrology and water quality module is carried out by using perturbation analysis method. The results show that: in hydrology, The most sensitive parameters to the peak flow of SWMM model are N-imperv (Manning coefficient of impervious area) and Des-perv (depth of water storage in impermeable area) and Des-perv (depth of water storage in low-lying area of impermeable area). The most sensitive parameters of peak COD concentration of discharge outlet are road maximum accumulation, road rate constant, roof maximum accumulation and roof rate constant. The conventional development construction model and the low impact development construction model were simulated and compared to study the rain flood control effect and water quality change of different models. The results show that the runoff coefficient of conventional development model, Hong Feng discharge, The number of overloaded inspection wells and pipelines and the discharge of organic matter are both increased than the present situation.) the low flow coefficient of the development and construction model, the flow rate of Hong Feng, and the overloaded inspection well are affected by the low discharge coefficient of the development and construction model. By analyzing and comparing the control effects of different low impact development models, it is concluded that the rainfall intensity of combined LID permeable surfacing Rain Water Huayuan 4) is higher than that of conventional models. The earlier and larger the peak of organic matter emissions from low-impact development models, It is an important research direction of low impact development mode to control Rain Water in the early stage and deal with it effectively.) the Lid measure has a great advantage over the conventional development and transformation plan in the aspect of economic and social benefits. The research of this subject is of great importance to the new city of J city. The technical reference is provided for the revamping of the regional rainwater pipe network. It provides a theoretical basis for the construction of J City Sponge City.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU992;TV213.9

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