云南省地形隆起高度与切割深度分析  

Analysis of Topographic Uplift Height and Cutting Depth in Yunnan Province

作　　者：肖丽琼 周汝良[1] 龙晓敏 田园 XIAO Liqiong;ZHOU Ruliang;LONG Xiaomin;TIAN Yuan(School of Geography and Ecotourism,Southwest Forestry University,Kunming 650224;School of Water Resources,Yunnan Agricultural University,Kunming 650500,China)

机构地区：[1]西南林业大学地理与生态旅游学院,昆明650224 [2]云南农业大学水利学院,昆明650500

出　　处：《重庆师范大学学报（自然科学版）》2023年第2期151-160,共10页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金面上项目(No.31860213);云南省重大科技专项(No.202002AA100007)。

摘　　要：[目的]绝对海拔难以表达真实的地形隆起、沟谷切割或盆地塌陷程度,定义和量化地形隆起高度与切割深度对于多种山地地貌等地学现象的刻画与研究都具有支持作用。[方法]基于数字高程模型数据并以云南省为研究区,提出一种地形隆起与切割程度的指标构建方法。该方法以地理栅格地图代数为单元,利用小流域分割山地区域并选取每个流域的平均海拔为样本点构建地表平均趋势面,并以该趋势面为起算点。[结果]1)地形隆起高度与切割深度能很好地表达大型地貌的隆起与切割变化,更能表征山体特征,体现大地域间的山体构造差异。2)云南省地形隆起高度与切割深度取值主要集中于-500~500 m;它的空间分布特征与平均海拔变化规律相似,均呈倒“U”型分布。3)云南省的低海拔区地形隆起高度与切割深度为-157~599 m;中海拔区东部地形隆起高度多小于252 m而切割深度的绝对值多小于439 m,西部地形隆起高度为252~<579 m而切割深度为-439~<-157 m;高海拔区地形隆起高度为579~<1 807 m而切割深度为-1 332~<-439 m;极高海拔区地形隆起高度为1 807 m。4)云南省的地形隆起高度与切割深度在纬向上整体呈现出由西向东逐渐下降的趋势,在经向上则从北到南呈下降的趋势。[结论]地形隆起高度与切割深度指标的构建弥补了现有地学指标无法刻画山体向上隆起、沟谷向下切割特征的不足之处,更能反映大倾斜面即大地域间的山体构造状况,并为多种地学研究提供数据支撑。[PurposesJIt is difficult to express the real degree of topographic uplift,gully cutting or basin collapse by absolute elevation,and defining and quantifying the height and depth of topographic uplift and cutting are useful for the portrayal and study of various geological phenomena such as mountainous landforms.[Methods]Based on the digital elevation model data and Yunnan Province as the research area,a method is proposed to construct an index for the degree of topographic uplift and cut.The method uses the geographic raster map algebra as the part,divides the mountainous area by small watersheds and selects the average elevation of each watershed as the sample point to construct the average trend surface,and uses this trend surface as the starting point.[FindingsJ1)Topographic uplift height and depth of cut can well express the uplift and cut changes of large landforms,better characterize mountain features,and reflect the differences of mountain structure between large regions.2)The values of topographic uplift height and depth of cutting in Yunnan Province are mainly concentrated in the range of-500 to 500 m,and its spatial distribution characteristics are similar to that of the average elevation changing pattern with inverted“"U"type distribution.3)The uplift height and cutting depth of low altitude terrain in Yunnan Province are-157~599 m.In the middle elevation area,the eastern uplift height is mostly less than 252 m and the absolute value of the cutting depth is mostly less than 439 m,while the western topographic uplift height is 252~<579 m and the cutting depth is-439~<-157 m;The elevation of topographic uplift in high altitude area is 579~<1807 m and the cutting depth is-1332~<-439 m.The elevation of topographic uplift in extremely high-altitude area is 1807 m.4)The topographic uplift height and cutting depth of Yunnan Province are analyzed by latitude and longitude profiles.In the latitudinal direction,the overall trend is gradually decreasing from west to east.From north to south,the cutting of topo

关 键 词：隆起与切割 地形趋势面 应用研究 剖面分析 云南省 

分 类 号：P931[天文地球—自然地理学]