适用于地形复杂地区水土流失评价的高分辨率DEM建立方法  

Research on generating high resolution hydrologically correct DEMs in eroded topographic area

作　　者：郭伟玲[1] 杨勤科[1] 汪翠英[1] 李文凤[1] 

机构地区：[1]西北农林科技大学资源环境学院

出　　处：《干旱地区农业研究》2008年第3期246-252,共7页Agricultural Research in the Arid Areas

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB407203)

摘　　要：选择地形复杂、水土流失严重的东北黑土漫岗区和南方红壤丘陵区为研究区,利用AUNDEM软件和1∶1万数字地形图,对两地区高分辨率水文地貌关系正确DEM的建立方法进行研究,并对所建DEM的质量进行了评价。结果表明,利用ANUDEM和1∶1万地形图插值建立的两个样区DEM三个主要参数分别为:东北黑土漫岗区分辨率1 m,迭代次数40,第二糙度系数0.5;南方红壤丘陵区分辨率5 m,迭代次数40,第二糙度系数0.6。通过与基础数据比较、DEM对地形的表现能力及水系网络分析三个方面对DEM的质量进行了评价,结果表明所建DEM能正确表现地形的形态及其与水系网络的关系,其派生等高线与原等高线符合度高。利用ANUDEM和数字地形图,可建立两类型区水文地貌关系正确的DEM,为水文和土壤侵蚀模拟分析提供支持。Research was conducted to generate hydrologically correct DEM of large-scale in the undulated hilly region in Northeast China and in steep hilly region in South China with 1：10000 digital topographic maps, including contours, spot heights, streams and lakes, and using the ANUDEM software. The derived contours, the representation of topography and river networks were selected to evaluate the quality of the DEM. Result showed that using digital map and ANUDEM software can generate hydrologically correct DEM of large-scale in these two sample regions. For generating the DEM, three main parameters of ANUDEM including resolution, iteration number and 2nd roughness, were 1 m, 40, and 0.5 in the undulated hilly region in Northeast China and 5 m, 40 and 0.6 in the steepy hilly region in South China. The derived contours and river networks were highly up to the input data. The DEM generated can correctly describe the topography characteristics and the relationship of physiognomy and hydrology.

关 键 词：数字高程模型 ANUDEM 分辨率 东北黑土漫岗区 南方红壤丘陵区 

分 类 号：S127[农业科学—农业基础科学]