天山北麓流域面积高度积分特征及其构造意义  

Geomorphology Characteristic and Tectonic Response of the Northern Tianshan Represented by Hypsometric Integral

作　　者：赵洪壮[1,2] 李有利[1,2] 杨景春[1] 司苏沛[1,2] 

机构地区：[1]北京大学城市与环境学院,北京100871 [2]北京大学地理科学中心地表过程分析与模拟教育部重点实验室,北京100871

出　　处：《山地学报》2009年第3期285-292,共8页Mountain Research

基　　金：国家自然科学基金项目(40571013)~~

摘　　要：提取了天山北麓河流水系流域的常规地貌计量指标(盆地大小、面积和高差)以及面积高度积分,通过对流域面积高度积分曲线形态特征、面积高度积分值的分析,结合区域地质构造活动,探讨了面积高度积分对板内再生造山带新构造活动的指示意义以及天山北麓流域的地貌发育过程。研究表明,北天山流域的次集水盆地面积高度积分与次集水盆地的面积和高差都没有相关性,堆积作用和轻微构造抬升作用都会影响冲积扇区次集水盆地,使其面积高度积分值偏高。河流面积高度积分曲线形态和面积高度积分值在空间分布上的差异,反映了天山北麓3排逆断裂褶皱带的不同的构造活动特征。面积高度积分曲线的循环形态特征,揭示了强烈构造运动与河流剥蚀作用影响面积高度曲线形态发育的动态演绎过程。The river-system developing pattern in the orogenic belt interior and its response and feedback to the tectonic uplift and climate change, has been playing the role of tectonic geomorphology and river geomorphology research hotspots. The structure terrain indicator-hypsometric integral, reflects the evolution and evolved degree of the topography, but the terrain evolution often concerns with the tectonic movement. This paper withdraws the conven- tional measuring indicators of the landform from the northern Tianshan Valley, such as the basin, area, elevation and hypsometric integral. Based on the analysis of the regional hypsometric-curve morphological characteristic and the value of the hypsometric integral, combining the late Cenozoic stratigraphy and the activities of the regional geological structure, the article studies the hypsometric instruction significance to the neotectonic movement in the regenerated orogenic zone and to the basin landform evolution of the northern Tianshan Mountain. It indicates that the sub-basin hypsometric integral does not have the relevance with the difference of the area and the altitude. Also, the river accumulation and the minor tectonic uplift will affect the sub-basins in the alluvial fan region and make the value of hypsometric integral higher. The differences on the spatial contribution between the morphological feature of the hypsometric curve and the value of the hypsometric integral illustrate the active tectonic different patterns of three row folds in the northern piedmonts of the Tianshan Mountains. The circulating characteristic of the hypsometric curve explore the dynamic evolutional process that how the strong tectonic activity and the river erosion control the shape transition of the hypsometric curve.

关 键 词：面积高度积分 构造运动 河流 天山 

分 类 号：P931.2[天文地球—自然地理学]