摘要
利用数字高程数据和空间分析方法,提取三峡库首区长江支流的河长坡降指标(SL)以及标准化坡降指标(SL/K),对该区构造活动进行分析。结果显示,研究区水系发育主要受断裂构造、地层岩性和新构造运动的影响,在空间上存在一定差异性,说明研究区构造活动存在区域性差异。在不同岩性地区,特别是三叠系地层区,水系响应较为明显,这与地层的抗水流侵蚀强度有关。该区水系发育受断裂构造控制作用较小,但受新构造抬升影响较大。
We examine the stream length-gradient SLindex and gradient index SL/K for concavity studies,and analyze the tectonic activities in the head area of the Three Gorges reservoir based on DEM data and spatial analysis method.Consequent analysis reveals that the main factor causing the landform is tectonic uplifting.Tectonic fault exhibits a strong influence on river profile in the study area.However,the tectonic processes are distinct in different tributaries.The tectonic activities are very strong in the left bank and weak in the right bank.The differential lithology distribution is also anther aspect of the profile feature.In a general,the longitudinal profiles of the river tributaries are well controlled by neotectonic movement,tectonic faults and lithological difference.
出处
《大地测量与地球动力学》
CSCD
北大核心
2015年第2期278-282,共5页
Journal of Geodesy and Geodynamics
基金
中国长江三峡集团公司科研专项基金(SXSN/3354)
关键词
三峡库首区
河长坡降
断裂构造
新构造运动
head area of the Three Gorges reservoir
stream length-gradient
faults
neotectonic movement
作者简介
刘小利，博士，副研究员，主要从事GIS与遥感地质研究，E—mail：liuxl．j@163．com。
