基于DEM的黄土坡耕地地表糙度测定方法研究  

Surface Roughness Determination of the Loess Sloping Field Based on DEM

作　　者：赵龙山[1] 梁心蓝[1] 张青峰[1] 兰敏[1] 吴发启[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《地理与地理信息科学》2010年第4期86-89,94,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金项目(40871133);国家"973"重点基础研究发展计划项目(2007CB407201)

摘　　要：提出了一种基于DEM的测定地表糙度的方法,并对其测算的地表糙度与链条法测定值进行了比较。结果表明:该方法测定的地表糙度具有离散度小、可操作性强、效率高等特点,而且对地表结构不会造成破坏;在高精度DEM的支撑下,测定的地表糙度更能反映地表实际状况。该研究为进一步研究地表糙度与土壤侵蚀的关系奠定了基础。In order to study more about the determination of surface roughness,especially the surface roughness of the loess sloping field,the 1×2 m2 plots micro-scale surface topography was scanned with the help of laser scanner at a sub-centimetre scale under the condition of artificial simulated rainfall experiments with net rainfall intensity of 60 mm/h,90 mm/h and 120 mm/h,respectively.Digital elevation models（DEMs） were established subsequently with a spatial resolution of 2 mm×2 mm based on GIS technology in this study.Furthermore,a new and practical DEM-based method used for surface roughness determination under the support of GIS,has been presented,and its roughness value has been compared with the roughness value determined by chain at the same situation.The results showed：1） The surface roughness measured by improved method has a dispersion of small,operable,high efficiency,yet can not cause damage to the surface structure;2） Based on high-precision DEM,it′s roughness value can better reflect the actual state of the surface.This study provides a new approach for the determination of the Loess Plateau sloping field surface roughness,but also lays a foundation for the further surveying of surface roughness and its relationship with soil erosion process.

关 键 词：地表糙度 链条法 耕作措施 微地形 黄土 

分 类 号：S157[农业科学—土壤学] P208[农业科学—农业基础科学]