基于栅格DEM与水流路径的黄土区沟缘线自动提取技术研究  

Automated extraction of shoulder line of valleys based on flow paths from grid Digital Elevation Model (DEM) data

作　　者：刘鹏举[1] 朱清科[1] 吴东亮[2] 朱金兆[1] 唐小明[2] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室 [2]中国林业科学研究院资源信息研究所

出　　处：《北京林业大学学报》2006年第4期72-76,共5页Journal of Beijing Forestry University

基　　金："973"国家重大基础研究计划项目(2002CB1115).

摘　　要：基于数字高程模型(DEM)进行沟缘线的自动提取是黄土丘陵沟壑区进行分布式水文计算与土壤侵蚀建模的关键技术.该文以基于栅格数字高程模型进行河网提取与流域划分技术为基础,基于栅格单元间八流向算法构建水流路径,提出一种基于汇流路径坡度变化特征确定沟坡段,进一步形成封闭沟缘线的新方法,并编程实现了该方法.通过对蔡家川流域1∶10000等高线生成2m数字高程模型,依据35°作为判断沟坡单元的标准,自动生成沟缘线分布图,并与原始坡度分布图比较,取得满意的结果.The extraction of a continuous shoulder line of valleys with a precise location is a critical technique in constructing the mechanism-process models of spatial distribution, such as those for soil erosion, sediment transportation and runoff process in gully areas of the Loess Plateau. The extraction technique presented in this paper is based on a hydrological method of river network and catchment boundary extraction, utilizing slope variation of a flow path to define the feature segment of slope profile and produce a continuous shoulder line of valleys. In this paper, the authors presented an algorithm, by which the drainage network and the continuous shoulder line of.valleys were extracted automatically from the DEM of Caijiachuan watershed in Jixian County, Shanxi Province, which is located in the gully area of the Loess Plateau. The final result agrees with the optical interpretation from slope distribution in the experimental area.

关 键 词：数字高程模型 地貌特征提取 沟缘线 

分 类 号：P208[天文地球—地图制图学与地理信息工程]