摘要
地形是影响地表径流和土壤侵蚀的重要因素,坡度等指标是流域水文和土壤侵蚀预报的重要变量。DEM在区域土壤侵蚀中应用研究主要包括:如何实现对侵蚀区地形的表达,使之能准确、科学和有效地表达地形形态和侵蚀沟道网络结构;在多种尺度上,用什么指标实现表征地形对土壤侵蚀发生过程的影响;用什么方法提取或者处理地形因子,如何建立地形因子与土壤侵蚀关系。引入新的DEM理念和算法,应用高精度地形测量数据和数字地形图,改进DEM质量,考虑尺度效应并将已有地形因子研究与区域土壤侵蚀模型研究结合,是今后的主要研究方向。
Terrain is a primary factor to affect the hydrological and erosion processes. Slope gradient and length, ete, are key parameters of soil erosion prediction models and watershed hydrological models. Researches on the application of DENs and digital terrain analysis in regional soil erosion modeling include： how to make a representation of terrain shape and gullies structures and enhance to generate hydrologically correct DEM; which parameters or variables to be used to describe the influences of terrain on soil erosion processes at the multiple scales; how to extract the ero-terrain factors based on digital terrain analysis, GIS spatial analysis, and digital image processing strategies; and how to make a algorithms for relationship between terrain variables and soil erosion. By introducing advanced views of terrain representation and interpolation algorithm from western and improving the DEMs based on higher accuracy hypsography data and digital topography maps, taking scaling issues into account and integrating the existed researches on erosion terrain factors and regional soil erosion model, are key issues in this study field in the future.
出处
《地理信息世界》
2009年第1期25-31,45,共8页
Geomatics World
基金
国家重点基础研究发展计划项目资助(973计划)(2007CB407203)
水利部公益性行业科研专项项目资助(200701035-1)
