摘要
选定黄土丘陵沟壑区的王家沟流域为研究对象,以地形图和遥感影像资料为主要信息源,利用GIS表面分析和叠置分析方法,获取坡耕地和梯田的坡向分布图,讨论了地貌形态对DEM和影像判读的影响及提高精度的方法;结合农作物种植面积的统计资料,计算出不同坡向上农作物的增产量和保土保肥量.采用市场价值法和机会成本法对该流域的坡改梯和筑坝淤地等工程治理措施所取得的经济效益进行定量分析.
Considering geomorphologic feature of the loess gully and hilly areas, the authors discuss a specific method to extract land distribution map and DEM effectively from remote sensing image and topographical map; then acquire the data about aspects of land-use types based on surface analysis and overlay analysis of GIS. Taking Wangjiagou watershed for example of comprehensive soil-erosion control in loess landform, and based on the data of plant area of crops, the authors calculate the added-productivity of crops in different aspects. Lastly, the paper quantitatively analyses the economic profits of the engineering project by use of market-value method and opportunity-cost method.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2004年第6期40-43,共4页
Engineering Journal of Wuhan University
关键词
水土保持
经济效益分析
地理信息系统
黄土丘陵沟壑区
soil and water conservation
Economic benefits analysis
geographic information system
loess gully and hilly areas
