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我国是一个多山国家,广义山地约占全国陆地面积的69.2%,狭义山地约占33.3%。建制市中山地城市的比例达到35%,建制县中山地城市的比例高达51%。近年来,山地城市发生内涝的案例屡见不鲜,山地城市内涝的发生与其特点密不可分。首先,山地城市具有雨旱分明,降雨集中的特点,同时雨峰靠前,雨型急促,易短时形成强降雨,发生局地内涝。其次,山地城市坡度大,产流汇流快,
My country is a mountainous country, with broadly defined mountains accounting for 69.2% of the country’s land area and narrowly defined mountains accounting for 33.3%. The proportion of cities in the cities of the established cities reached 35%, and the proportion of Zhongshan cities in the cities of the cities of the prefectures reached as high as 51%. In recent years, the occurrence of waterlogging in mountainous cities is not uncommon, and the occurrence of waterlogging in mountainous cities is closely linked with its characteristics. First of all, the mountainous cities have the characteristics of clear rain and clear rain and concentrated rainfall. At the same time, the rainy peaks lead to the rapid rainy season, resulting in strong rainfall in a short time and local waterlogging. Second, the mountainous city has a large slope, fast current convergence,