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记者:最近几年,极端天气频发,暴雨引发的城市洪灾现象普遍,给各地人民带来了一定的损失,也引起社会各界的关注。那么,您认为,除天气原因,造成城市洪灾的因素有哪些?苏南:都市洪灾发生除了环境因素之外,另一个重要因素则是地文因素的改变。在快速都市化的过程中,不透水层的面积快速增加,与原本天然蓄水的洼地及农地快速缩减,造成地表径流量增加,集流时间缩短,尖峰流量
Reporter: In recent years, extreme weather is frequent and torrential rains have caused widespread urban floods, which have brought certain losses to people all over the country and also aroused the concern of all sectors of society. So, in your opinion, in addition to the weather, what are the factors causing urban flood? Sunan: In addition to the environmental factors, urban floods are another important factor is the change of geographical factors. In the process of rapid urbanization, the area of the impermeable layer rapidly increases, rapidly shrinking from the depressions and farmlands of the original natural water storage, resulting in an increase of surface runoff, shortened collection time, and peak flow