基于MIKE URBAN模型的武汉市典型城区内涝研究——II：管网排水能力分析
Research on Waterlogging in Typical Urban Area of Wuhan City Based on MIKE URBAN Model—II: Analysis of Drainage Capacity of Pipeline Network

以武汉市楚河汉街为研究区，在假设基于MIKE URBAN模型构建的研究区城市雨洪模型结果合理的前提下，根据模型模拟的不同重现期情景下研究区管网的超载情况，评价了管网的排水能力。针对排水能力不足设计标准的管道，提出将其管径扩增为原来的2倍的排水能力提升措施，再进行研究区在有、无提升措施两种情况下的内涝模拟，并进行对比分析。结果表明：1) 在现行管网条件下，研究区管网的排水能力仅基本满足1年一遇的设计标准。研究区在5年一遇或以上的情景下，内涝程度比较严重，以楚河南岸的东湖西路两端、烟霞路与松竹路路口附近区域的内涝程度最严重。2) 有提升措施情况下，管网排水能力提升明显，能基本满足现行规范中5~10年一遇的规定；楚河北岸不再出现内涝节点，楚河南岸仍存在内涝节点，但数目明显减少，内涝程度也明显减轻。
Chu River and Han Street area in Wuhan City was taken as the study area. Given that the results of the urban storm water model based on the MIKE URBAN model of the study area were reasonable, the overload situations of the pipeline network in the study area under the different design rainstorm scenarios simulated by the model were analyzed, and the appropriateness of the drainage capacity of the pipeline network was evaluated. For the pipes with insufficient drainage capacity to the design standard, an improvement measure ofincreasing the pipe diameter to twice the original size was proposed to increase their drainage capacity. The waterlogging situations in the study area with and without the improvement measure were both simulated, and a comparative analysis was carried out. The results show that: 1) In the case of the current pipeline network, the drainage capacity of the pipeline network in the study area can only basically meet the design standard with the recurrence interval of 1 year. Under the scenarios of the recurrence interval of 5 years or above, the degree of waterlogging in the study area is relatively serious. The most serious waterlogging nodes are located in both ends of Donghu West Road and the area near the intersection of Yanxia Road and Songzhu Road on the south bank of the Chu River. 2) With the improvement measure considered, the drainage capacity of the pipeline network has been significantly improved, which can basically meet the requirement in the current specifications with the recurrence interval of 5 to 10 years. Waterlogging nodes no longer appear on the north bank of the Chu River. There are still waterlogging nodes on the south bank of the Chu River, but the number of waterlogging nodes has been significantly reduced, and the degree of waterlogging has also been significantly reduced.