吕梁山麓不同岩组段小流域地貌特征  

Geomorphologic Characteristics of Small Watersheds in Different Formations from the Foot of the Lyuliang Mountains

作　　者：岳科杉 赵金贵[1] 王建民[1] YUE Keshan;ZHAO Jingui;WANG Jianmin(QColloge of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《太原理工大学学报》2022年第2期299-307,共9页Journal of Taiyuan University of Technology

摘　　要：选择吕梁山麓自Ar-Pt、C-O、C-P、T、Q五个岩组段10个小流域作为研究对象,借助ArcGIS软件,提取各小流域面积-纵比降关系以及河流宽度、分支比、弯曲度等地貌参数,展现了区内不同岩组段小流域地貌特征:1)在形成时间、形成环境、构造发育程度接近的情况下,吕梁山麓20 km;范围内小流域不同岩组段抗侵蚀能力由大及小依次为:太古-元古界河流>三叠系>石炭-二叠系>寒武-奥陶系>新近系-第四系黄土,抗侵蚀系数分别为2.294、2.232、1.486、1.394、1;2)小流域河流形成时间越长,水系分支比有逐渐变小的趋势;河流形成时间越短,支流间平均宽度越大;河流形成时间越久,纵比降变小,朝均衡化方向发展。In order to illustrate geomorphic characteristics in different sorts of formations, 10 small watersheds from Ar-Pt, C-O, C-P, T, and Q formations in the foot of Lyuliang Mountains were selected as the research objectives and the relationship between the area of these watersheds and its vertical gradient, as well as the geomorphic parameters including the width of the rivers, branch ratio, and curvature, were obtained by using ArcGIS software. We got such conclusions:(1) In 20 km;research area, the erosion resistance of these formations is Archean Proterozoic > Triassic > Carboniferous Permian>Cambrian Ordovician>Neogene Quaternary loess and its resistance coefficient is 2.294, 2.232, 1.486, 1.394, and 1, respectively, if the formation time, paleoenvironment, and structural development do not show a clear difference.(2) The longer the river formation time is, the smaller the branch ratio of the river system is;The shorter the river formation time is, the larger the average width between tributaries is;The longer the river formation time is, the smaller the vertical gradient is, and the development trend is towards equalization.

关 键 词：吕梁山麓 小流域 抗侵蚀能力 形成时间 

分 类 号：P931[天文地球—自然地理学]