涪江上游下切深度、速率及它们对下切过程控制因素的约束  

Dissection Depths of the Upper Reaches of Fujiang River and Their Constraints on Controlling Factors of Erosion Process

作　　者：陈浩[1] 董廷旭[1] 李勇[2] 文星跃[3] CHEN Hao;DONG Tingxu;LI Yong;WEN Xingyue(College of Resources and Environmental Engineering,Mianyang Teachers'College,Mianyang Sichuan 621006;National Key Laboratory of Oil a|nd Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059;College of Land and Resources,China West Normal University,Nanchong Sichuan 637002,China)

机构地区：[1]绵阳师范学院资源环境工程学院,四川绵阳621006 [2]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [3]西华师范大学国土资源学院,四川南充637002

出　　处：《重庆师范大学学报（自然科学版）》2019年第6期53-57,F0002,共6页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金（No.41671220）;四川省科技厅科技计划项目（No.2019YJ0496）;四川省教育厅自然科学基金（No.14ZB0265）

摘　　要：【目的】对涪江上游下切过程的控制因素进行分析,有助于揭示青藏高原东缘地区流域地貌演化对内、外力因素的响应机制。【方法】以ArcGIS水文分析模块为技术平台,以涪江上游干流河道为中心线提取宽度为10km的条带剖面,据此将涪江上游流经区域划分为岷山山脉区、川西高原区、盆地周缘低丘平坝区等3个地貌单元。分别计算不同地貌单元河流的切割深度和切割速率,以此为基础,将侵蚀基准面下降、气候转湿等外力因素对涪江下切过程的控制作用约束为一个常量。【结果】虽然不同地貌单元隆升速率存在较大差异,但内、外力因素对整个涪江上游河段下切过程的贡献比值较为一致,即涪江上游干流河道对流经区域地表的切割,大致28%为构造隆升所贡献,72%为侵蚀基准面下降、气候转湿等外力因素所贡献。【结论】应用条带剖面提取法对涪江上游下切深度及内、外力因素对涪江下切过程的贡献比值进行标定,可为河流地貌发育机制的定量研究提供方法参考。[Purposes]The response mechanism of river geomorphological evolution in the eastern margin of the Qinghai-Tibet Plateau was revealed by analyzing the controlling factors of erosion process in the upper reaches of Fujiang river basin.[Melhods]The swath profile of main stream of the upper reaches of Fujiang river was extracted and based on hydrological analysis module of ArcGIS,the drainage basin was divided into Minshan mountain and western Sichuan plateau and low hill and flat area of basin margin.Dissection depths and incision rates of the upper reaches of Fujiang river on different geomorphology region was calculated,controlling of exogenous forces to erosion process were intended to be constant.[Findings]The results of analysis indicate that there are differences for uplift rate on the different geomorphology region,but the effect proportion of endogenous forces and exogenous forces to erosion process were consistent in the upper reaches of Fujiang river basin.The effect proportion of endogenous force(tectonic uplift)and exogenous forces(climate change and base level change of erosion)is 28%to 72%.[Conclusions]Dissection depths of the upper reaches of Fujiang river and their constraints on controlling factors of erosion process were calibrated and based on extraction method of swath profile,the method reference was provided for quantitative research of the development of rivers geomorphology.

关 键 词：涪江上游 下切深度 下切速率 控制因素 

分 类 号：P94[天文地球—自然地理学]