高强度人类活动下河网水系时空变化驱动机制分析——以浦东新区为例

Analysis of driving forces and changes in river network under intensive human activity: A case study of Pudong New Area, Shanghai

基于遥感与GIS技术,利用2000,20003年航空影像解译数据,分析了浦东新区河网变化及其与其他土地利用类型之间相互转变的数量特征,对河网缩减驱动机制进行了探讨．研究结果表明: 2000-2003年浦东新区河网水系发生了很大变化,主要表现为水域面积减少和河网密度的快速降低,纵横交错干支流组成的“网”状水系变成了仅由干流组成的“口”状水系;城镇扩展的同时缺乏对河网水系有效保护机制是河网缩减的直接原因,河网水系的缩减速度与建设用地变化速率之间存在很好的对应关系;建设用地尤其是交通用地的增加、开发区崛起、人口的大量迁入等在引起土地利用变化的同时,对河网缩减具有重要推动作用．

Based on the muti-temporal remotely sensed data of nero photographs, this study attempted to reveal the driving forces and spatial-temporal trends in river network in Pudong New Area by depicting and analyzing the intensity of river loss and related transformation modes. The results showed that： 1） from 2000 to 2003, the area of water body and the density of river network changed greatly; the transformation from water body to the urban （residential and traffic） land use acted as the main contribution to the changes in water body, leading to remarkable reduction in both quantity and density of river network; 2） the speed of river reduction is in good correspondence to the change ratio of build-up area, due to fact that not enough attention has been paid to the river network protection during the expansion of the urbanization; 3） the driving forces of decrease in river network are mainly the urbanization, the development of open up district and the booming population.