城市雨水排水系统的管网模型研究

发布时间：2018-05-24 05:55

本文选题：城市雨水管网 + 排洪河道　；参考：《西南交通大学》2015年硕士论文

【摘要】：城市雨水排水系统是城市重要基础设施之一,雨水系统的完善程度决定着城市生产、生活的正常运转水平。根据城市雨水排水系统的构成,可将雨水排水系统分为两级,一是城市雨水管道系统,二是排洪河道。两级排水系统之间相互连接,交互影响。排洪河道的水位及流量变化情况,直接或间接影响城市雨水管网的运行状况。因此,为全面系统地分析城市雨水管网系统的运行状况,识别可能出现内涝的区域,进而有针对性的拟定有效的防涝措施,应将城市雨水管网与河网结合起来考虑,建立城市雨排系统耦合计算模型。本研究对此进行了一定的尝试,开展了如下主要工作：1.从城市雨水排水系统的角度出发,分析了城市雨水管网系统与排洪河道之间的联系特征,论述了两级排水系统耦合分析的理论依据；从雨水径流与排放过程入手,研究了内涝产生的机理,并分析了相关防涝措施。2.通过雨水径流过程的分析与研究,本文采用数学建模的手段建立了由输入模型、水动力模型及耦合模型三部分构成的城市雨排系统耦合计算模型,并研究了各模型现行理论与计算方法在耦合计算模型中应用的可行性及适用性。分析表明,降雨模型可选用芝加哥合成降雨过程线模拟降雨过程；产流模型可选用霍顿公式模拟入渗过程；汇流模型可选用等时流线法模拟汇流过程；其建模及计算工具可采用MIKE URBAN中的降雨径流模块。雨水管网水动力模型可选用动力波法模拟管网汇流过程,其建模及计算工具采用MIKE URBAN中的MOUSE引擎模块；河网水动力模型选用四点隐式差分理论模拟河网汇流过程,其建模及计算工具采用MIKE 11中的HD水动力模块。耦合模型依据管网模型理论,采用MIKE FLOOD作为模型耦合及计算工具,模拟雨水管网系统与河网系统的水动力交换过程。3.本文以成都市某区域为例,建立了该区域的城市雨排系统概化模型。根据室外排水设计规范中的相关规定,选用重现期为3年的非恒定降雨情景作为输入条件。为简化模型,提高运算效率,本文在模型计算时,依据雨水管网的管径大小,将雨水管网系统分为两级,进行分级模拟计算。通过对该区域内一级雨水管网与河网的水动力耦合计算,可得到一、二级雨水管网系统连接点的水位及流量随时间变化的情况,将其时间序列带入二级雨水管网系统模型并作为其边界条件,可精确计算出各节点的流量及水位变化情况；针对该研究条件下可能发生内涝的区域,采用设置凹式绿地、建造调蓄池等防涝措施用以削减排水系统的峰值流量,并对此进行了模拟分析,结果表明所采取的防涝措施是有效的。本论文所取得的研究成果为城市雨水排水系统及城市防涝系统分析提供了一种新的方法,具有一定的实际参考价值。
[Abstract]:Urban Rain Water drainage system is one of the most important infrastructure in the city. The perfection of Rain Water system determines the normal operation level of urban production and life. According to the composition of urban Rain Water drainage system, the Rain Water drainage system can be divided into two levels, one is the urban Rain Water pipeline system, the other is the flood discharge channel. The two-stage drainage systems are interconnected and interact with each other. The changes of water level and discharge of flood drainage channel directly or indirectly affect the operation of urban rainwater pipe network. Therefore, in order to comprehensively and systematically analyze the operation status of urban rainwater network system, identify the areas where waterlogging may occur, and then draw up effective waterlogging prevention measures, we should consider the combination of urban rainwater pipe network and river network. The coupling calculation model of urban rain drainage system is established. This research has carried on the certain attempt to this, has carried out the following main work: 1. From the point of view of urban Rain Water drainage system, this paper analyzes the relationship between urban rainwater pipe network system and flood discharge channel, discusses the theoretical basis for coupling analysis of two-stage drainage system, and starts with the process of Rain Water runoff and discharge. In this paper, the mechanism of waterlogging is studied, and the relative measures of waterlogging prevention are analyzed. Based on the analysis and research of Rain Water runoff process, the coupled calculation model of urban drainage system is established by mathematical modeling, which consists of three parts: input model, hydrodynamic model and coupling model. The feasibility and applicability of the current theories and calculation methods of each model in the coupled computing model are also studied. The analysis shows that Chicago synthetic rainfall process line can be used to simulate rainfall process in rainfall model, Horton formula can be used to simulate infiltration process in runoff model, isochronous streamline method can be used to simulate flow confluence process in confluence model. Its modeling and calculation tools can be used in MIKE URBAN rainfall runoff module. The hydrodynamic model of rainwater pipe network can be used to simulate the flow confluence process of pipeline network by using dynamic wave method, the modeling and calculation tools are MOUSE engine module in MIKE URBAN, and the four-point implicit difference theory is used in the hydrodynamic model of river network to simulate the flow confluence process of river network. The modeling and calculation tools are based on HD hydrodynamic module of MIKE 11. The coupling model is based on the pipe network model theory and MIKE FLOOD is used as the model coupling and calculation tool to simulate the hydrodynamic exchange process between the rainwater pipe network system and the river network system. Taking a region of Chengdu as an example, a generalized model of urban rain drainage system in this area is established in this paper. According to the relevant provisions of outdoor drainage design code, unsteady rainfall scenarios with a recurrence period of 3 years are selected as input conditions. In order to simplify the model and improve the operation efficiency, according to the pipe diameter of the rainwater pipe network, this paper divides the rainwater network system into two levels and carries on the hierarchical simulation calculation. Through the hydrodynamic coupling calculation of the first grade rainwater pipe network and the river network in this area, the variation of the water level and discharge of the connection point of the first and second grade rainwater pipe network system with time can be obtained. When the time series is brought into the two-stage rainwater network system model and taken as its boundary condition, the flow and water level changes of each node can be calculated accurately, and the concave green space can be set for the area where waterlogging may occur under this research condition. In order to reduce the peak discharge of drainage system, the flood prevention measures such as storage tank are constructed and simulated. The results show that the waterlogging prevention measures are effective. The research results in this paper provide a new method for the analysis of urban Rain Water drainage system and urban waterlogging prevention system, and have certain practical reference value.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU992.03

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