风暴潮与极端暴雨叠加作用下九龙半岛内涝防控方法

Waterlogging prevention and control methods in Kowloon Peninsula under superimposed effect of storm surge and extreme rainstorm

考虑城市地形、建筑、排水管网要素,构建风暴潮与极端暴雨叠加作用下的九龙半岛内涝灾害模型,对多种内涝防控方法进行了量化评估。结果表明:构建的内涝灾害模型可准确反映不同位置淹没范围及水深等关键物理量;止回阀与挡水板能够通过切断海水倒灌渠道削弱风暴潮对城市内涝的放大效应,1000年一遇风暴潮与极端暴雨叠加作用下,西九龙深水埗钦州街附近区域加装止回阀后管网溢流率下降14.8%、净排水量增加5.7%;八号货柜码头加装1 m高挡水板可使淹没面积降低26%;地下蓄洪池通过汇集与存储地表径流减轻周边淹没程度,降雨重现期为100 a条件下界限街游乐场淹没面积降低34%。

Taking the Kowloon Peninsula of Hong Kong in the Guangdong-Hong Kong-Macao Greater Bay Area as the study area,considering the urban terrain,buildings,and drainage network elements,a waterlogging disaster model under the superposition of storm surge and extreme rainstorm was constructed,and a variety of waterlogging prevention and control methods were quantitatively evaluated.The results show that the waterlogging disaster model can accurately reflect key physical quantities such as the extent of inundation and water depth at different locations.Check valves and baffles can weaken the amplification effect of storm surges on urban waterlogging by cutting off seawater backflow channels.Under the superposition of a 1000 a return period storm surge and extreme rainstorms,the overflow rate of the pipeline network decreases by 14.8%and the net drainage volume increases by 5.7%after the addition of check valves in area near Yenchow Street,Shamshuipo,West Kowloon.The addition of a 1 m baffle at Container Terminal No.8 reduces the inundated area by 26%.Underground flood storage ponds reduce the level of inundation around the perimeter by pooling and storing surface runoff,which reduces the inundation of the Boundary Street Playground by up to 34%under the condition of a 100 a rainfall return period rainfall event.