长江上游重点水土流失区遥感动态监测及泥沙输移分析

以嘉陵江流域重点产沙区为试点,选择1992和1996年两个时段,通过遥感、GIS以及数学模型相结合的方法对水土流失现状和水土保持效益进行调查分析,建立水土流失变化动态监测信息系统,并从流域的土壤侵蚀推测和分析流域河流泥沙的输移变化。

A REMOTE SENSING AND GIS BASED DYNAMIC SOIL EROSION MONITORING SYSTEM IN THE MAJOR SOIL EROSION AREAS IN UPPER JIALINGJIANG WATERSHED

Jialingjiang river is one of major_soil erosion watershed of the Yangtze river, its basin area and average annual runoff account respectively for 15.8% and 15.6% of the total amount of the Yangtze river upstream the Yichang hydrologic station, but its sediment production accounts, for 25.5%. Severe soil erosion is not only a big threat to the downstream ecological environment but also a critical factor in the future operation of the Three Gorge reservoir. Therefore, the government has already been developing a number of soil and water conservation projects in this watershed since 1989. Its two main upstream tributaries Bailongjiang and Xihanshui are the most severe soil erosion prone areas, which were selected in this study. Two time series of Landsat TM images in 1992 and 1996 were used to investigate the dynamic variation of soil erosion in the area. An Arc/Info GIS based dynamic spatial information system was developed for data storage and manipulation with its user interface compiled with GeoMedia and Visual Basic.