基于地貌区划的秦巴山区地性线密度系数空间分布特征  

Spatial distribution characteristics of geographic linear density coefficient in Qinba Mountain area based on geomorphic regionalization

作　　者：张珊 查小春 刘恺云 ZHANG Shan;ZHA Xiaochun;LIU Kaiyun(School of Geography and Tourism,Shaanxi Normal University,Xi′an 710119,Shaanxi,China)

机构地区：[1]陕西师范大学地理科学与旅游学院

出　　处：《陕西师范大学学报（自然科学版）》2020年第1期32-39,共8页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家科技基础资源调查专项(2017FY100905)

摘　　要：借鉴地貌割切密度系数,基于栅格数字高程模型和地貌特征线提取技术,对秦巴山区流水侵蚀剥蚀作用形成的地貌类型进行特征线的提取和分析,计算了流水侵蚀剥蚀中山、低山和丘陵区的地貌割切密度系数,并进行了可靠性分析。结果表明:秦巴山区流水侵蚀剥蚀中山、低山和丘陵区的地貌割切密度系数分别为2.82、3.53和3.83,流水侵蚀剥蚀区的地貌割切程度为丘陵区>低山区>中山区;秦岭南北侧流水侵蚀剥蚀中山、低山和丘陵区地貌割切程度各有差异,尤以秦岭以北流水侵蚀剥蚀中山区差异最显著。Geomorphic regionalization is the basis for the study of spatial differentiation of regional geomorphology,and it plays an important role in the geomorphological research work of Qinba Mountain area.The index of geographic linear density coefficient,which can account for the horizontal cutting degree of geomorphology,is one of the important standards in determining the geomorphic regionalization and drawing the geomorphological maps.Based on the grid digital elevation model and the extraction technology of geomorphic feature line,the feature line of landform types formed by the water erosion and denudation in Qinba Mountain area were extracted and analyzed,and the geomorphic cutting density coefficient of the middle-mountain,low-mountain and hilly areas were calculated in Qinba Mountain area,respectively.The reliability of geomorphic cutting density coefficient was also analyzed.The results showed that the geomorphic cutting density coefficients of the middle-mountain,low-mountain and hilly areas formed in Qinba Mountain area were 2.82,3.53 and 3.83,respectively.Geomorphological cutting degree in water erosion and denudation areas was hilly area>low-mountain area>middle-mountain area.Moreover,there were differences in geomorphological cutting degree whether north or south sides of the Qinling Mountains.In particular,the difference of the middle-mountain area formed by water erosion and denudation was most significant in the north of Qinling Mountain.

关 键 词：地性线密度系数 地貌割切程度 秦巴山区 地貌区划 

分 类 号：P931[天文地球—自然地理学]