中文摘要：

城市化进程的加快改变了地表覆被的时空分布特征，为探求地表覆被时空分布对城市雨洪的影响作用，以南京市主城区为对象，根据遥感影像资料与实测降雨数据，利用GIS空间分析技术，基于马尔柯夫转移矩阵分析了南京市主城区地表覆被空间格局的分布变化，建立了地表覆被时空变化影响下的南京市主城区雨洪模型，模拟分析了南京市主城区范围内城市地表覆被的空间分布格局变化对城市地表产流量、局部节点水量等的影响。研究结果表明：径流系数与地表覆被面积年际变化呈负相关，地表径流、最终地表蓄水与区域地表覆被覆盖面积成正相关。地表植被的空间分布格局对雨洪影响关系密切，局部节点汇水区植被覆盖率上升36．13％，区域产流量可以减少28．47％。地表覆被空间分布的不均匀是造成城市区域地表局部淹水的因素之一；地表覆被对城市雨洪产生的洪流水量形成具有一定的减缓、推后、延迟作用，同时可以接受、蓄积降雨产生的地表积水。

英文摘要：

In order to study the effects of the land cover spatiotemporal distribution characteristics on urban flood, in this study, based on the RS image and measured rainfall data of Nanjing City, this paper analyzes the influence of land cover on urban rain flood with GIS technology and Markov transfer matrix, The urban flood model was estab- lished to simulate the process of runoff under the influence of land cover spatiotemporal distribution. Discussion on the simulation result of runoff and node water quantity shows that the land cover has an effect on the overall tenden- cy of urban rain flood, the land cover distribution can impact the local area flooding. There is a negative correlation between runoff coefficient and yearly change of land cover area, and there is a positive correlation between surface runoff, surface water storage and land cover area. When the land cover area in local confluence increase 36.13%, the surface runoff may decrease 28.47%. The inhomogeneous distribution of land cover is one of factors causing ur- ban local inundation. Rational distribution of land cover can alleviate the problem of urban flood, which could sup- ply the technical support for urban flood control.