天山北麓河流纵剖面与基岩侵蚀模型特征分析

doi:10.11821/xb200905005

地理学报 ›› 2009, Vol. 64 ›› Issue (5): 563-570.doi: 10.11821/xb200905005

天山北麓河流纵剖面与基岩侵蚀模型特征分析

赵洪壮^1,2, 李有利^1,2, 杨景春¹, 吕红华^1,2

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

收稿日期:2008-12-10 修回日期:2009-03-03 出版日期:2009-05-25 发布日期:2009-05-25
作者简介:赵洪壮(1974-),男,汉,山东莱州人,在读博士生,研究方向为基于GIS/RS 技术的地貌和环境演变建模及可视化。E-mail: zhaohongzhuang@pku.edu.cn
基金资助:
国家自然科学基金项目(40571013)

The Longitudinal Profiles of the Ten Rivers in North Tianhan Mountains and Their Tectonic Significance

ZHAO Hongzhuang^1,2, LI Youli^1,2, YANG Jingchun¹, LU Honghua^1,2

1. College of Urban and Environmental Sciences,Peking University,Beijing 100871,China;
2. MOE Laboratory for Earth Surface Processes,Department of Geography,Peking University,Beijing 100871,China

Received:2008-12-10 Revised:2009-03-03 Online:2009-05-25 Published:2009-05-25
Supported by:
National Natural Science Foundation of China,No.40571013

摘要/Abstract

摘要：

本文提取分析天山北麓10 条河流的纵剖面，通过函数拟合纵剖面形态特征，同时运用基岩侵蚀力模型来研究河流纵剖面形态的发育演化过程，来揭示河流纵剖面的发育与构造活动之间的内在关系。研究表明：天山北麓河流地貌地形发育阶段处于河流侵蚀作用强烈的前均衡状态时期。塔西河的纵剖面凹曲度最大，向东西两侧河流凹曲度依次降低，乌鲁木齐河与四棵树河凹曲度最小，河流的凹曲度(θ) 和河道坡度(K_S) 的数值分布规律与所对应构造部位晚更新世以来的抬升速率和地壳缩短速度相一致，排除时间、气候因素和基岩性质影响因素后，发现晚更新世以来天山北麓河流纵剖面形态变化主要受构造抬升作用的影响。

关键词: 河流纵剖面, 基岩侵蚀模型(S-A 模型), 河流凹曲度, 河道坡度, 构造运动, 天

Abstract:

In this paper we carry out a study on the longitudinal profile of the 10 rivers in the north Tianshan Mountains, by fitting the characteristics of the river longitudinal profile using four function patterns, and analyzing the evolution process of the 10 rivers' longitudinal profile based on the stream-power incision model. We reveal the relationships between the evolution process of the river and the tectonic activity. Our study indicates that the concavity index of the Taxihe River is the greatest one among the 10 rivers, and the concavity indexes of the other rivers become small one by one in turn on both sides, so the concavity indexes of the Urumqi River and the Sikeshuhe River are the least ones comparatively. The evolution phase of the river topographic form is the pre-steady-state topography. Consequent analysis reveals that the upward-convex features of the profiles and slope-area plots can be explained by the elevation of the bedrock profile getting higher and higher and the uplift being beyond the incision around the target area.

Key words: longitudinal profile, stream-power incision model, concavity index, stream slope, tectonic, river evolution process, Tianshan Mountain

赵洪壮,李有利,杨景春,吕红华. 天山北麓河流纵剖面与基岩侵蚀模型特征分析[J]. 地理学报, 2009, 64(5): 563-570.

ZHAO Hongzhuang,LI Youli,YANG Jingchun,LU Honghua. The Longitudinal Profiles of the Ten Rivers in North Tianhan Mountains and Their Tectonic Significance[J]. Acta Geographica Sinica, 2009, 64(5): 563-570.

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天山北麓河流纵剖面与基岩侵蚀模型特征分析

The Longitudinal Profiles of the Ten Rivers in North Tianhan Mountains and Their Tectonic Significance

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