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中文摘要：
为更好地适应城市水文安全需要及理解雨季局地内涝频发的机理,利用Landsat TM影像和线性光谱混合模型分析南京江宁新区下垫面格局特征。结果表明：新区不透水面和植被的面积比均超过40.00%,比例相当、布局均衡,且下垫面组分和空间分布特征与新区开发阶段有关;新区开发阶段及主导功能导致城市用地类型的下垫面组分差异,建设用地、待建用地、绿地、水域、农林地的平均不透水面面积比依次减小,分别为75.87%,62.12%,41.15%,34.42%,22.76%,植被面积比则依次增加,裸土和水面的面积比多数低于10.00%;新区汇水区下垫面格局已对自然水文格局产生扰乱,主要表现为不透水面占据汇水区结合部、高低地间泄洪通道而形成内涝易发区。
英文摘要：
For enhancing urban hydrological security and understanding the mechanism of the developing flood hazards,we used a Landsat TM image and linear spectral mixture model to extract and analyze the land surface characteristics in the Jiangning New Area of Nanjing.The results show that the ratio of the impervious surface and the vegetation coverage ratio in the study area were higher than 40.00%,in similar proportions and with balanced distributions,and the land surface components and spatial distribution characteristics were influenced by the development of the study area.The new area＇s development and leading functions lead to differences in land surface components.The average impervious surface ratios of the construction land,the land under construction,the green land,the water area,and the agricultural and forestry land were 75.87%,62.12%,41.15%,34.42%,and 22.76%,respectively;the vegetation coverage ratio increased;and the ratios of bare soil and water surface area were mostly lower than 10.00%.The land surface pattern of the catchment area affected the hydrological pattern of the new area,with the impervious surface not only covering the boundaries between many catchment areas but also cutting the flood channels between highlands and lowlands.
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