雨水径流与管网、河道水位和水泵间相互影响研究

发布时间：2018-05-23 16:29

本文选题：积水区 + 溢流量　；参考：《天津大学》2015年硕士论文

【摘要】：城市排水管网系统是城市的重要基础设施。随着城市不透水表面增加和极端降雨的频繁发生,降雨径流量增多,发生内涝的风险增大。城市内涝给我国带来了极大损失,本文选题研究城市雨水径流和城市内涝问题,具有重要的理论和应用价值。本文在总结国内外研究现状的基础上,建立了雨水径流、排水管网、河道和泵站模拟模型,研究了不同降雨强度和历时下,地表溢流与排水管网、河道水位和泵站间的相互影响,并针对区域存在问题,提出了适合当地的低影响开发措施。主要得到了以下结论:(1)重现期为1 a时三个研究区域基本不积水或有零星积水,说明排水管网与一年一遇的设计标准基本相符。(2)相同降雨历时下,随着重现期的增大,老城区(区域1)的积水面积和积水深度显著增大。重现期为2 a时,有两处最大积水深度超过0.50 m。重现期增大到5 a及其以上时,有多处出现明显积水,且积水时间都在1 h以上。重现期为50 a时,最大积水深度接近1.0 m,对公共安全的危害严重。(3)新城区(区域2和3)处于城市开发阶段,径流系数较小。重现期为2a时,两个区域积水面积较小,积水最大深度分别为0.15 m和0.03 m。重现期增大到10 a时,两个区域开始有较大的积水面积。当重现期继续增大到50 a时,两个研究区域的最大积水深度分别为0.30 m和0.14 m,远小于区域1的最大积水深度。(4)针对区域1、2和3开展LID措施(绿色屋顶、渗透铺装、下凹式绿地),溢流消减率分别为12%~52%、10%~100%和28%~57%。(5)管网的溢流量受河道初始水位影响强烈。在水泵流量较小时,水泵开启水位对管网溢流量影响较小,但是降雨前利用水泵降低河道水位对于管网排水能力有很大提升。
[Abstract]:Urban drainage pipe network system is an important infrastructure of the city. With the increase of impervious surface and the frequent occurrence of extreme rainfall, the rainfall runoff increases and the risk of waterlogging increases. Urban waterlogging has brought great losses to our country. The study of urban Rain Water runoff and urban waterlogging has important theoretical and practical value. On the basis of summing up the present research situation at home and abroad, the simulation model of Rain Water runoff, drainage pipe network, river channel and pumping station is established, and the surface overflow and drainage pipe network are studied under different rainfall intensity and duration. The interaction between river water level and pumping station, and the local low impact development measures are put forward in view of the problems existing in the region. The main conclusions are as follows: (1) when the recurrence period is 1 a, there is basically no water accumulation or sporadic water accumulation in the three study areas, which indicates that the drainage pipe network basically accords with the design standard of once a year, and under the same rainfall duration, with the increase of the recurrence period, The area and depth of water in old urban area (area 1) increased significantly. When the recurrence period was 2 years, the maximum depth of hydrops was more than 0.50 m. When the recurrence period increased to 5 years or more, there were obvious hydrops in many places, and the time of hydrops was more than 1 h. When the recurrence period is 50 years, the maximum depth of water accumulation is close to 1.0 m, and the harm to public safety is serious. 3) the new urban area (region 2 and 3) is in the stage of urban development, and the runoff coefficient is relatively small. When the recurrence period is 2a, the area of hydrops in the two regions is smaller, the maximum depth of hydrops is 0.15 m and 0.03 m, respectively. When the recurrence period increased to 10 a, the two regions began to have a large area of stagnant water. When the recurrence period continues to increase to 50 years, the maximum depth of water in the two study areas is 0.30 m and 0.14 m respectively, which is much smaller than the maximum depth of water in area 1. The LID measures (green roof, permeable pavement) are carried out for area 1 / 2 and 3, respectively. The overflow reduction rate of the concave greenbelt is 12 / 522 / 10100% and 28 / 57 / 5 respectively) the overflow discharge of the pipe network is strongly affected by the initial water level of the river. When the pump flow is small, the water level of pump opening has little influence on the discharge of pipe network, but using water pump to reduce the water level of river before rainfall can greatly improve the drainage capacity of the pipe network.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU992

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