基于水力模型的武汉黄孝河区域内涝评估
发布时间：2019-01-04 23:51
【摘要】：在许多旧城区改造和新城区建设案例中,由于没有从整个城区的角度考虑地面覆盖变化对城区径流和排放的影响,致使有些工程建设后径流量峰值大幅度提高,造成市区内涝。另外,在城市建设过程中湖泊等调蓄水体被侵占,原有排水通道被取缔或过水断面大幅度减少,均可导致城市内涝加剧。国内许多城市内涝事件频发,武汉市近几年暴雨时内涝程度也较为严重。本文拟对武汉市黄孝河地区排水系统的防涝能力进行评估,并尝试构建内涝评估体系,为定量评估城市排水系统防涝能力提供技术支持。本文对武汉市内涝成因进行了定性分析。以武汉市黄孝河地区排水系统为研究对象,利用InfoWorks ICM对其进行概化,构建了研究区域的水力水质模型并将其参数属地化;通过模拟分析,以溢水检查井数、超载管道长度与根数、渍水深度与渍水面积为考察指标,对不同重现期条件下排水管网的承载能力进行了评估,结果表明:有4个管段超载时间较长、5个检查井渍水时间较长,属优先改造处;当重现期p≤5a时,随着重现期p的增加超载管段数递增,当p≥5a时超载管段数趋于稳定的状态;现有高、低排泵站均仅能应对重现期为10a的降雨;得到了应对不同重现期区段降雨超载管段所占的比例。构建了以淹水面积比、溢水节点数比、超负荷管段数比和单位汇水面积溢水量为一级评价指标的内涝定量评价体系,对黄孝河地区排水系统高排区的两个子系统进行了内涝评估,得到了与风险图相吻合的评估结论。武汉市黄孝河地区排水系统防涝能力的评估结果可为该地区防涝改造提供参考。所提出的内涝定量评价体系,可用于合理确定防涝工程的建设进度安排。
[Abstract]:In many cases of old urban reconstruction and new urban construction, because of not considering the effect of the change of ground cover on urban runoff and discharge from the whole urban area, the peak value of runoff is greatly increased after construction of some projects, resulting in urban waterlogging. In addition, in the process of urban construction, lakes and other regulating water bodies are encroached upon, and the original drainage channels are banned or the cross section of overwater is greatly reduced, which can lead to the worsening of urban waterlogging. Many cities in China have frequent waterlogging events, and the degree of waterlogging in Wuhan is more serious in recent years. This paper intends to evaluate the waterlogging capacity of the drainage system in Huangxiahe area of Wuhan City and try to construct the waterlogging evaluation system to provide technical support for the quantitative evaluation of the waterlogging capacity of the urban drainage system. In this paper, the causes of waterlogging in Wuhan are qualitatively analyzed. Taking the drainage system of Huangxiahe area of Wuhan City as the research object, the hydraulic water quality model of the study area was constructed and its parameters were localized by using InfoWorks ICM to generalize it. Taking the number of overflow inspection wells, the length and root number of overloaded pipeline, waterlogging depth and waterlogging area as the inspection indexes, the bearing capacity of drainage network under different recurrence periods is evaluated. The results show that the overload time of 4 pipe sections is longer and the waterlogging time of 5 inspection wells is longer. When the recurrence period p 鈮，
本文编号：2400969
[Abstract]:In many cases of old urban reconstruction and new urban construction, because of not considering the effect of the change of ground cover on urban runoff and discharge from the whole urban area, the peak value of runoff is greatly increased after construction of some projects, resulting in urban waterlogging. In addition, in the process of urban construction, lakes and other regulating water bodies are encroached upon, and the original drainage channels are banned or the cross section of overwater is greatly reduced, which can lead to the worsening of urban waterlogging. Many cities in China have frequent waterlogging events, and the degree of waterlogging in Wuhan is more serious in recent years. This paper intends to evaluate the waterlogging capacity of the drainage system in Huangxiahe area of Wuhan City and try to construct the waterlogging evaluation system to provide technical support for the quantitative evaluation of the waterlogging capacity of the urban drainage system. In this paper, the causes of waterlogging in Wuhan are qualitatively analyzed. Taking the drainage system of Huangxiahe area of Wuhan City as the research object, the hydraulic water quality model of the study area was constructed and its parameters were localized by using InfoWorks ICM to generalize it. Taking the number of overflow inspection wells, the length and root number of overloaded pipeline, waterlogging depth and waterlogging area as the inspection indexes, the bearing capacity of drainage network under different recurrence periods is evaluated. The results show that the overload time of 4 pipe sections is longer and the waterlogging time of 5 inspection wells is longer. When the recurrence period p 鈮，
本文编号：2400969
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