利用DEM提取陕北黄土高原沟谷网络的汇流阈值研究  

Conflux Threshold of Extracting Stream Networks from DEMs in North Shaanxi Province of Loess Plateau

作　　者：李俊[1] 汤国安[2] 张婷[2] 肖晨超[2] 

机构地区：[1]西北大学城市与资源学系,陕西西安710069 [2]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210097

出　　处：《水土保持通报》2007年第2期75-78,共4页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金(40671148;40571120);高等学校博士学科点专项科研基金(20050319006)

摘　　要：以陕北黄土高原多地貌类型样区为实验样区,采用5m分辨率的DEM为基本信息源,构建不同汇流阈值与所提取沟壑密度量化关系。实验结果显示,汇流阈值X与沟壑密度Y呈定量统计模型。根据所获得的陕北黄土高原不同地区模型系数值,可有效地构建汇流阈值与沟壑密度之间的定量关系。这对于两者之间的相互求解,特别是科学、合理地确定汇流阈值,提供了理论依据。By taking 5 m grid cell DEMs as an experiment basis, the relation between flow accumulation threshold and gully density in the Loess Plateau area, Northern Shaanxi, China, is investigated quantitatively and statistically. Experimental results show that a statistical model could be constructed as a formula. In the formula, the coefficient is found to have a strong relation with terrain complexity and types and play a significant role in the model. In the fixed terrain area, a reasonable flow accumulation threshold could be derived based on the model, which is of critical significance not only in the theory, but also in application.

关 键 词：DEM 黄土高原 沟谷网络 汇流阈值 

分 类 号：P231.5[天文地球—摄影测量与遥感]