摘要
将DEM分辨率对流域分布式侵蚀学坡长提取的影响分为数据平滑和采样间距两种组分作用形式,选取陕西省安塞县县南沟流域为研究区,探究两种分辨率组分对侵蚀学坡长提取的影响程度以及水平分辨率对侵蚀学坡长空间格局的影响。研究发现,DEM从2.5 m至100 m这一降分辨率过程中,坡长平均值呈现对数递增的趋势。对2.5 m至100 m分辨率DEM提取坡长进行不同分辨率组分作用研究发现,用不同分辨率DEM提取侵蚀学坡长时采样间距对坡长的影响作用均大于数据平滑的。对10 m至100 m水平分辨率DEM提取的坡长通过半变异函数分析其空间格局变化情况,结果表明:坡长变异函数采用球状模型拟合效果最佳,并且随着分辨率降低,坡长的空间结构总体变异和随机变异减小,空间相关性范围增大。
In this paper, the influence of DEM resolution to the distributed erosion slope length was divided into two forms of data smoothing and sampling interval. It explored the influence of the two different resolution components to the degree of distributed erosion slope length extraction and the horizontal resolution to the spatial distribution structure of erosion slope length. The site for the case study was Xiannangou watershed which is located at Ansai County, Shaanxi, China. It was found that with the decrease of DEM resolution from 2.5 m to 100 m, the average value of slope length was increased logarithmically. Through the resampling method to build a series of DEM, the influence of DEM resolution to the distributed erosion slope length was divided into data smoothing effect and sampling interval effect to discuss. The main conclusion is that the effect of the sampling interval on the slope length for the length of slope length extracted from 2.5 m to 100 m resolution DEM is greater than that of data smoothing. The spatial distribution structure of slope length which extracted from 10 m to 100 m resolution DEM was analyzed by semi variation function. The result shows that the slope length semi-variation function agrees well with the spherical model. As the DEM resolution decreases rapidly, the spatial structure variation and the random variation of slope length decrease gradually, contrary the scope of spatial relevance is increased.
作者
樊宇
郭伟玲
吴江
土祥
赵令
FAN Yu;GUO Weiling;WU Jiang;TU Xiang;ZHAO Ling(School of Geomatics, Anhui University of Science and Technology, Huainan 232001, China;College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China)
出处
《人民黄河》
CAS
北大核心
2019年第4期78-82,共5页
Yellow River
基金
国家自然科学基金资助项目(41501294)
关键词
侵蚀学坡长
数据平滑
采样间距
空间格局
半变异函数
安塞县县南沟流域
distributed erosion slope length
data smoothing
sampling interval
spatial distribution
semi-variation function
Xiannangou watershed of Ansai County
作者简介
樊宇(1993-),男,江苏常州人,硕士研究生,研究方向为DEM提取坡长的尺度效应分析;通信作者:郭伟玲(1979-),女,河南安阳人,讲师,博士,主要从事DEM尺度效应研究工作E-mail:gwl0904@163.com.
