A STUDY ON SURFACE WATER RESOURCES IN CHAOBAIHE BASIN OF BEIJING BASED ON BEIJING-1 MICROSATEELITE DATA

摘要

It has become a hotspot to detect regional water resources using the technology of remote sensing. Beijing-1 microsatellite has the advantages of wide swath, high resolution and short revisit periods, and so it is excellent at dynamic detection of regional water resources. Chaobaihe basin is one of most important water source areas of Beijing. In this paper, Beijing-1 microsatellite fused images were mainly used to make a study of surface water resources in Chaobaihe Basin of Beijing. Firstly, the surface water information extracting method was studied and finally Object-Oriented classification was chosen as the main method; Secondly, the distributions of surface water both in rainless seasons and rainfall seasons of 2007 was obtained in this basin. Thirdly, with TM images of 1999 and 2001 added, its temporal and spatial distribution variations were analysed. Finally, driving forces for the variations of surface water in the basin. The results showed that: (1) It is feasible that using Beijing-1 Micro-Satellite images to study surface water in Chaobaihe Basin of Beijing. (2) The variation of total surface water area between in the rainless seasons and in the rainfall seasons is not big, but the surface water areas of rivers and ponds are smaller in rainless seasons. (3) The annual change of surface water area of the basin takes on decreasing trend from 1999 to 2007. (4) The driving forces are mainly decreasing of precipitation, increasing of annual average temperature, decreasing of vegetation cover in some regions and so on.