Quantitative analysis of the macro-geomorphic evolution of Buyuan Basin, China

论文摘要

Buyuan River, the largest tributary within the Chinese Lancang-Mekong River region downstream of the Jinghong Dam, plays a crucial role in river function and ecosystem service of the Lancang-Mekong River. The geomorphic evolution of a basin exerts a key control on riverine sediment input and transport. In this study, the geomorphic characteristics of Buyuan Basin are analyzed using morphological parameters, hydrodynamic parameters and the stream power river incision model. The results show that: 1) The slight north-south difference of channel density is most likely due to lithology and independent of tectonic activity and climate. 2) The weak tectonic activity and the low hypsometric integral（HI） value suggest that the macroscopic landform condition limits erosion and sediment production. 3) The logarithmic longitudinal profile of the main channel defends that the upstream sediments generated by erosion are easily deposited in the downstream channel, rather than being transported directly into the Lancang-Mekong River. 4) Approximately 74% of the reaches have annual average stream power less than 500 W·m-1. The narrow variation ranges of stream power in 50% of the river channel indicate relatively stable hydrodynamic environment. 5) Stream erosion and tectonic activity make the longitudinal profiles of the main channel and most tributary channels unstable. The wide range（between 22.01 and 45.58 with θ=0.43） of steepness index(ksn) of longitudinal profiles implies differential uplift in the basin.

论文目录

文章来源

类型: 期刊论文

作者: GU Zhen-kui,FAN Hui,SONG Zhao-jun

来源: Journal of Mountain Science 2019年05期

年度: 2019

分类: 基础科学

专业: 自然地理学和测绘学

单位: Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security, Yunnan University,Institute of International Rivers and Eco-Security, Yunnan University,Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science and Engineering, Shandong University of Science and Technology

基金: financially supported by the National Key Research and Development Program of China (2016YFA0601601),the National Science and Technology Support Program (2013BAB06B03),the National Natural Science Foundation of China (41472155),Candidates of the Young and MiddleAged Academic Leaders of Yunnan Province (2014HB005),Program for Excellent Young Talents of Yunnan University

分类号: P931

页码: 1035-1047

总页数: 13

文件大小: 1357K

下载量: 14

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