摘要
雅鲁藏布江流域区域构造活动强烈,河谷地貌和水系形态差异明显,本文基于ASTER GDEM-30 m数据,探讨该流域构造地貌和水系之间的关系。通过对雅鲁藏布江中游及其7条支流的河长坡降、Hack剖面、均衡坡降、面积-高程积分曲线和面积-高程积分值等参数分析,结果表明雅鲁藏布江中游流经的桑日-加查河段,河长坡降峰值最高,反映该地区强烈的构造活动;多雄藏布、美曲藏布、夏布曲、湘曲和门曲的Hack剖面上凸程度较大,均衡坡降值较高,流经的地区可能新构造活动较活跃;年楚河和拉萨河的Hack剖面近直线,均衡坡降值偏低,流经的区域可能新构造活动较弱。7条支流的面积-高程积分曲线均呈“S”形,面积-高程积分值在0.35~0.60,处于壮年期发育阶段。从较大的空间尺度对雅鲁藏布江中游的36个子流域进行分析,显示其北岸的面积-高程积分值普遍高于南岸,表明第四纪以来冈底斯山脉和喜马拉雅山脉差异性抬升,导致雅鲁藏布江两岸地区处于不同的地貌演化阶段。
Based on ASTER GDEM-30 m data,combined with the analysis of the river length slope,Hack profile,isostatic slope,area-elevation integral curve and area-elevation integral value of the middle reaches of the Yarlung Zangbo River and its seven tributaries,the frequent regional tectonic activities in the Yarlung Zangbo River basin and its effect on the valley geomorphology and stream morphology are discussed so as to reveal the relationship between tectonic geomorphology and drainage system.The results show that the Sangri-Jiacha reach of the middle reaches of Yarlung Zangbo River has the highest peak value of river length slope,which reflects the strong tectonic activity in this area.In Hack profiles,the upconvexity degree of Duoxiong Zangbo,Meiqu Zangbo,Xiabuqu,Xiangqu and Menqu is large,and their equilibrium slope value is high,indicating that the area where these rivers cut through may be more mobile in neotectonic activity,while the Hack profiles of Nianchu River and Lasa River are nearly straight with low isostatic slope value,representing weak neotectonic activity in the river flow area.The area-elevation integral curves of the seven tributaries all show an“S”shape,with the area-elevation integral values of 0.35~0.60,characteristic of prime development stage of the rivers.The analysis of 36 sub-basins in the middle reaches of the Yarlung Zangbo River shows that the area-elevation integral value of the north bank is generally higher than that of the south bank,which is considered to be resulted from the differential uplift of the Gangdises and Himalayas since the Quaternary,and the two sides of the Yarlung Zangbo River have experienced different stages of geomorphological evolution.
作者
马腾霄
杨文光
朱利东
张洪亮
钟摇
解龙
麦源君
罗璐
曹志超
MA Tengxiao;YANG Wenguang;ZHU Lidong;ZHANG Hongliang;ZHONG Yao;XIE Long;MAI Yuanjun;LUO Lu;CAO Zhichao(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第4期502-512,共11页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(41972118)
四川省科技计划重点研发项目(2020YFG0144)。
关键词
雅鲁藏布江
Hack剖面
河长坡降
面积-高程积分
构造地貌分析
Yarlung Zangbo River
Hack profiles
stream-gradient index
hypsometry integral
tectonic geomorphology analysis
