中文摘要：

利用2000-2015年间中国滨海地区112个地级以上城市的排水管道数据,分析了城市建成区排水管道密度及其变化情况,通过初始排水管道密度、末期排水管道密度和排水管道密度变化幅度三项指标计算出城市水安全弹性综合得分。在此基础上,将中国滨海地区112个地级市的城市水安全弹性分为高、较高、中等、较低和低五个等级,分析了滨海地区城市水安全弹性现状。结果显示：弹性等级越高,城市排水管道密度变化幅度越大;在空间分布上,长江三角洲地区的弹性整体高于环渤海地区和东南沿海地区;在研究期内,大部分城市排水管道密度有所增加,且2000-2005年期间变化较为明显。

英文摘要：

Based on the data of sewers in 112 cities in China＇ s coastal area from 2000 to 2015, density of sewers of built districts and their changes were analyzed. The comprehensive scores of urban water safety resilience were calculated by the initial sewer density, the final sewer density and the variation of sewer density. According to the scores, 112 prefecture-level cities are divided into five levels： the highest, the higher, medium, the lower and the lowest, reflecting the coastal areas of urban water safety and resilience of the status quo. The results show that the higher the elastic rating, the greater the changes of the density of urban sewers. In the spatial distribution, the resilience of the Yangtze River Delta is higher than that of the Bohai Rim and the southeastern coastal areas. During the studying period, the density of most of the urban sewers increased, and the changes were more obvious during the period from 2000 to 2005.