摘要
河流地貌对构造活动具有极高的相关性、敏感性,是研究新构造活动最切实有效的地貌标志之一。本文以30 m分辨率数字高程模型(DEM)为基础,利用ArcMap与Matlab软件提取的河流地貌因子(Horton定律比值和S-A双对数曲线),先后分析了思茅盆地内部的李仙江、藤条江、勐戛河、威远江、南班河和南腊河等的河流地貌特征,揭示新生代晚期强烈构造活动对河流发育的影响。结果表明:1)思茅盆地的河流多沿或平行于走滑断裂发育,低级别河网较好的符合Horton定律中一般河网的发育规律,而沿活动断裂带发育的高级别河网则表现出了明显的偏差;2)各集水盆地S-A双对数曲线均呈凹凸相间排列;3)各集水盆地河道的裂点分布特征与岩性变化不一致,这表明思茅盆地内部高级别河网的发育受岩性变化的影响较小,而主要受走滑断裂活动的影响。
The development of water system pattern is the most meaningful geological event that was accurately and completely recorded during the process of Late Quaternary in the area with the most active tectonic movements.In this paper,we carry out a study on the longitudinal profile of the 6 rivers in the Simao Basin,located in the southwest of China,by fitting the characteristics of the river longitudinal profile,and analyzing the evolution process of their longitudinal Profile based on the stream power incision model.The result shows:1)that the low-level rivers are better in accordance with the Horton Law,and the high-level rivers developed along the fault zone show obvious deviation from the Horton Law;2)that S-A fitting graphics of all rivers are arranged in concave and convex at intervals;3)that the lithologic variations do not correspond with changes in the characteristics of knickpoints.All the results inferred that Simao Basin is currently influenced by strike-slip fault.
作者
汝鑫
张世涛
董有浦
段佳鑫
吴可
王丹
张东越
Ru Xin;Zhang Shitao;DongYoupu;Duan Jiaxin;Wu Ke;Wang Dan;Zhang Dongyue(Kunming University of Science and Technology,Faculty of Land Resource Engineering,Kunming 650031)
出处
《地质科学》
CAS
CSCD
北大核心
2020年第4期1202-1213,共12页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金项目(编号:41802215,41762017)
云南省教育厅科学研究基金项目(编号:KKJB201721011)资助。
