摘要
为了找出能保证流域坡度统计分布最基本特征的最小面积阈值,该文基于1∶5万地形图建立数字高程模型(DEM),在3个不同地貌类型样区,提取坡度、坡长及等高线曲率等指标,并计算坡度频率曲线和不同流域面积的直方图相似度指数;计算并分析了各样区坡度分布与流域面积的关系,分析了流域面积与直方图相似度指数变化率之间的关系,完成流域最小面积的判定,从流域侵蚀及侵蚀地貌分带方面对确定的最小面积阈值进行了论证。该文得到破碎丘陵样区、缓坡丘陵样区和极陡山地样区面积阈值分别为19.51、118.39、144.77 km^2。
In order to find the minimum area threshold for statistical distribution of the watershed slope,based on the 1∶50000 topographic-based DEMs,in the three different landform type samples(including loess hill areas,undulated hills,and steeper mountains),the slope,slope length and contour curvature were extracted in this paper,and the slope frequency curve and the histogram similarity index of different watershed areas were calculated.The relationship between the slope distribution of each sample and the basin area had been analyzed.The minimum area of the basin had been determined based on the relationship between the basin area and the histogram similarity index change rate.The determined minimum area threshold had been discussed from the aspects of watershed erosion and erosion landform zoning.The minimum area threshold of the three areas listed above were 19.51,118.39,and 144.77 km^2 respectively.
作者
赵孜博
杨勤科
王春梅
ZHAO Zibo;YANG Qinke;WANG Chunmei(College of Urban and Environmental Science,Northwest University,Xi’an 710127,China)
出处
《测绘科学》
CSCD
北大核心
2020年第2期172-177,192,共7页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41371274)
国家重点研发计划专题(2017YFD0800502-01).
关键词
坡度
坡度统计分析
最小面积阈值
地貌形态演化
slope
slope statistical analysis
minimum area threshold
landform evolution
作者简介
赵孜博(1992—),女,河南项城人,硕士研究生,主要研究方向为侵蚀地形分析。E-mail:zhaozb@stumail.nwu.edu.cn;通信作者:杨勤科,教授.E-mail:qkyang@nwu.edu.cn
