城市化对南京市区域降水量变化的影响

随着城市化的发展，城市规模不断扩大，人口不断增长，人类活动加剧，城市的生产活动和特殊地面结构共同作用于大气，使大气边界层的特性发生变化，从而影响城市地区的降水、气温、辐射等。采用双累积曲线和t统计检验法，对南京地区降水量进行了统计分析，发现该区域发生大雨、暴雨的频率及年降水量均有增加的趋势，1970年后较为明显。城市降水量的增大，使区域出现峰高量大的暴雨洪水机会增加，加剧了南京市的防洪压力。

Influence of urbanization on regional precipitation of Nanjing City

With the process of urbanization, the uninterrupted extension of city scale, the continued increase of population, mankind activities and special ground constructions acting on atmosphere together etc., the characteristics of atmospheric layer have been changed, and effected temperature, precipitation and radiation of urban region. From the statistics of precipitation of Nanjiang Precipitation Station in the different periods, it is found that the annual precipitations and frequencies of rainstorm of Najjing City have been increasing, and the increase tendency is very distinct since 1970. Due to the cause of rainstrom, the frequencies of rainstorm flood are increasing and the pressure of flood control to Nanjing City aggravates.