【作者】 张杰；

【导师】 王景芸；

【作者基本信息】 湖北工业大学 ， 建筑与土木工程（专业学位）， 2020， 硕士

【摘要】 从2015年我国开始海绵城市试点建设,到目前各试点城市均已完成试点区域海绵城市建设,新一轮大范围的海绵城市建设即将全面展开。而在海绵城市建设全面推进的过程中,凸显出许多难题,其中在海绵城市建设规划编制过程中,各水要素指标的可达性评估大多仍采用定性分析或简单核算,评估结果往往不够精确。本文以武汉市江夏区为例,运用理论研究、定量分析、软件模型模拟等方法,对规划各项工程措施后的三大水要素(水安全、水生态、水环境)对应的四项约束性指标(管网排水能力、内涝防治能力、年径流总量控制率、面源污染削减率)的可达性进行了深入分析研究,并对不达标之处提出了针对性的改进方案,可为江夏区海绵城市建设规划的编制提供技术支撑,同时也为武汉市乃至全国全面推行海绵城市建设规划编制提供参考。本文主要工作和结论如下:(1)通过InfoWorks ICM软件对目标区域在五种不同重现期设计降雨事件下进行模拟,分析管道超负荷状态结果表明管道超载段数比例依次为0、7.70%、24.09%、36.34%、46.35%,且排水能力不满足p=2a的管道共有5段,且其中3段管道超负荷是由于自身过流能力不足所致,另外2段超负荷是因为下游管道过流能力不足所致。(2)将1D管道模拟结果与2D漫流模型耦合后,发现在20a一遇工况下存在6处淹水深度大于0.15m的淹水点,最大淹水深度为0.754m,最长淹水时间达120min以上,无法满足规划要求,对6处淹水点制定了相应改进方案。(3)通过InfoWorks ICM软件在实测2013年全年降雨数据条件下对年径流总量控制率指标进行了模拟,先采用赋值法分析得出的指标结果为73.2%,不满足年径流总量控制率目标值75%,然后用容积法对各类型地块做了精确的调蓄量分析,模拟后年径流总量控制率为72.6%,且算得实现75%的目标值需增加的调蓄量为8861m~3。(4)利用污染负荷模数法算得目标区域在中雨、大雨、暴雨三种降雨区间下的TSS、TN、TP污染物负荷量为99.43t/a、26.00t/a、1.90t/a。最后算得目标区域TSS、TP削减量为82.28t/a、3.77t/a,对应的面源污染削减率为82.75%,能达到海绵城市建设规划目标要求。更多还原

【Abstract】 Since the beginning of China’s sponge city pilot construction in 2015,all pilot cities have completed the construction of regional pilot project,and a new round of large-scale sponge city construction is about to begin.In such process,many problems have been highlighted,among which the toughest one is that,during the formulating of the construction plan of sponge cities,most of the accessible assessments of water element indexes still use qualitative analysis or simple accounting,and the assessment results are not accurate enough.Taking Jiangxia District of Wuhan as an example,this paper uses the methods of theoretical research,quantitative analysis and software model simulation to analyze the accessibility of the constraint indexes for three water elements,including the drainage capacity of pipe network,the prevention and control capacity of waterlogging for water security,the control rate of total annual runoff for water ecology,and the reduction rate of non-point source pollution for water environment.At the same time,this paper puts forward the targeted improvement plan for the non-conforming parts,which can provide technical support for the compilation of the sponge city construction planning in Jiangxia District,as well as reference for the comprehensive implementation of the sponge city construction planning in Wuhan and even the whole country.The main work and conclusions of this paper are as follow:(1)This paper simulates the target area under five different recurring design rain events through InfoWorksICM software.The analysis of the pipeline overload results shows that the proportion of overloaded pipeline sections is 0,7.70%,24.09%,36.34%,and 46.35%.There are 5 sections of pipelines whose drainage capacity does not meet 2a,and 3 of them are overloaded due to their own insufficient drainage capacity,while the other 2 sections are overloaded due to insufficient drainage capacity of downstream pipelines.(2)Coupling 1D pipe simulation results with 2D flooding model,it is found that there are 6 flooding points with flooding depth greater than 0.15m under 20a condition,among which the maximum flooding depth is 0.754m and the longest flooding time is more than 120min.An improvement plan is made for these 6 inundation points which can not meet the planning requirements.(3)The total annual runoff control rate index is simulated by InfoWorks ICM software under the actual rainfall data of 2013.The result of index analysis by value assignment method is 73.2%,which can not meet the target value of annual total runoff control rate of 75%.And using the volume method to analyze the storage of various types of land accurately,the total control rate of annual runoff after simulation is 72.6%,and the additional storage needed to achieve the target of 75%is calculated as 8861m~3.(4)The pollutant loads of TSS,TN and TP in the target area under the three rain intervals of medium rain,heavy rain and rainstorm are calculated using the pollution load modulus method.The results are 99.43t/a,26.00t/a and 1.90t/a respectively.Finally,the TSS and TP reduction in target area are 82.28t/a and 3.77t/a,and the corresponding non-point source pollution reduction rate is 82.75%,which can meet the requirements of sponge city construction planning.更多还原