南京市内涝灾害成因分析

近些年来，随着城市化进程的加快，城市内涝灾害日趋严重。利用水文学、地理学、规划学等学科的相关理论，分析南京市内涝灾害的成因。导致南京内涝灾害频繁的原因主要有：地形复杂，自然排水不畅；城市化导致南京市的年降雨量、汛期雨量、大雨和暴雨的发生频率增加；城市下垫面条件的改变导致地表径流量增加，汇流时间缩短；城市规划上的不足降低了城市对内涝灾害的承灾能力，城市化加重了城市涝灾的危害程度。

Analysis of Causes of Waterlogging Disasters in Nanjing City

In recent years, with the acceleration of urbanization process in Nanjing, the city waterlogging disasters become more and more serious. The theories of hydrology , geography and planning are applied to analyze the causes of waterlogging disasters in Nanjing City. The natural and geographical environment of Nanjing is very special. Urbanization leads to the reality that the annual precipitations, flood season precipitations and frequencies of rainstorm of Nanjing City have been increasing. The change of the urban underlying surface condition leads to the increase of surface runoff and the decrease of conflux time. Inadequate urban planning reduces the enduring ability of the city for waterlogging disasters. Urbanization aggravates the damage degree of waterlogging. All these are the main reasons that cause the waterlogging disasters of Nanjing City.