初期雨水调蓄池调蓄能力研究

发布时间：2018-03-06 04:00

本文选题：初期雨水　切入点：调蓄池　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：初期雨水调蓄池对控制面源污染有着非常明显的效果，并且实用性也比较强。它能收集污染负荷较大的初期雨水。无论是对新建雨水系统，还是改造现有排水系统，修建初期雨水调蓄池都能有效地降低污染负荷，并且具有良好的经济效益。本文围绕初期雨水厚度、调蓄池容积以及调蓄池的功效来对初期雨水调蓄池的调蓄能力展开研究。首先对滇池流域初期雨水截留量进行了研究，认为初期雨水截留量应根据各地不同的污染控制目标来确定，这样确定的初期雨水截留量是科学的。通过研究发现，利用“降雨事件分析法”能科学地计算出任意比例的初期雨水截留目标值。并利用该分析方法计算得到，要实现滇池流域50%全年降雨量的初期雨水截留目标，滇池流域初期雨水截留厚度为9.7mm。其次，对调蓄池的容积计算公式进行了研究。在本研究中，将调蓄池的容积计算分为合流制排水系统和分流制排水系统两种情况来研究。在分流制排水系统中，计算调蓄池的容积主要是先通过“降雨事件法”科学的计算出初期雨水截留量，进而得出分流制排水系统初期雨水调蓄池的容积。在合流制排水系统中，设置初期雨水调蓄池实际上是增大了系统的截留倍数，增加了系统的排水能力，从而减小了溢流外排量的大小。因此可以建立截留倍数与外排量的关系，通过外排量的削减目标来确定系统需增大多少截留倍数，从而确定调蓄池的容积。再次，介绍了SWMM模型的作用及其应用的领域，并将模型的模块理论进行了阐述，同时也介绍了SWMM模型的建模方法以及模拟结果的分析方法。最后，对合流制系统中的初期雨水调蓄池的截污功效进行了研究。通过一个实例介绍了SWMM模型模拟合流制排水系统（汇水面积为108.4ha）的过程，并将昆明地区1996年的每小时的降雨输入到模型，得出系统全年溢流总量为27.699万m3，总COD负荷为56.007吨；当在溢流口处设置V=2000m3的调蓄池后，全年的溢流污水量削减55.7%，COD负荷削减率为60.5%。同时，利用“芝加哥雨型”结合昆明地区的暴雨强度公式合成P=0.25，P=0.5，P=1的降雨序列，将这三种输入到模型中，得到在设置调蓄池前后，排水系统溢流量的情况。在P=0.25时，调蓄池对溢流污水量和COD负荷的削减率分别为100%，100%；在P=0.5时，，分别为33.38%，35.49%；在P=1时，分别为21.32%，23.1%。
[Abstract]:The initial Rain Water storage pool has a very obvious effect on the control of non-point source pollution, and it is also quite practical. It can collect the initial stage Rain Water, which has a heavy pollution load. Whether it is for the newly built Rain Water system or for the renovation of the existing drainage system, Rain Water storage tank can effectively reduce the pollution load and has good economic benefit. This paper focuses on the initial Rain Water thickness, the volume of the storage pool and the efficiency of the storage pool to study the initial capacity of the initial UNOMI_person1# storage pool. It is believed that the initial interception of Rain Water should be determined according to the different pollution control objectives in various places, and that it is scientific to determine the initial interception of Rain Water in this way. By using "rainfall event Analysis method", we can scientifically calculate the initial Rain Water interception target value of any proportion. By using this analysis method, we can obtain that we should realize the initial rainfall interception target of the Dianchi Lake Basin in 50%. In the early stage of Dianchi Lake Basin, the interception thickness of Rain Water is 9.7 mm. In this study, the volume calculation of the storage tank is divided into two cases: the combined flow drainage system and the distributary drainage system. To calculate the volume of the storage tank is to scientifically calculate the initial Rain Water's interception amount by "rainfall event method", and then to get the volume of the initial UNOMI_person1# storage tank in the diverging drainage system. In the combined drainage system, In the early stage of setting up the Rain Water storage pool, the interception multiple of the system is increased, the drainage capacity of the system is increased, and the size of the external discharge of the overflow is reduced. Therefore, the relationship between the interception multiple and the external discharge can be established. The volume of the storage tank is determined by the reduction target of the external discharge to determine how much interception multiple the system needs to increase. Thirdly, the function of SWMM model and its application field are introduced, and the module theory of the model is expounded. At the same time, the modeling method of SWMM model and the analysis method of simulation result are also introduced. Finally, the effect of the initial Rain Water storage tank in the combined flow system is studied. The process of simulating the combined flow system (the catchment area is 108.4 haa) with SWMM model is introduced by an example. The rainfall per hour in 1996 in Kunming area was input into the model, the total overflow amount of the system was 276,990 m3, and the total COD load was 56.007 tons. The rate of reduction of COD load is 60.5. At the same time, the rainfall series of "Chicago Rain Type" combined with the formula of rainstorm intensity in Kunming area are synthesized, and the three kinds of rainfall series are inputted into the model and obtained before and after setting up the storage tank. Discharge of drainage system. At P0. 25, the reduction rates of overflow sewage and COD load in the storage tank are 100 and 100, respectively; at P = 0. 5, 33. 38 and 35. 4910; at P = 1:00, 21. 32 and 23. 1, respectively.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU992

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