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[1]LIU Jingnan,CHANG Yuqiao,TIAN Peng,et al.Geomorphic Characteristics of Drainage Basins in Deqin-Weixi Area and Their Response to Tectonic Activities[J].Journal of Seismological Research,2023,46(03):315-352.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0033]

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Geomorphic Characteristics of Drainage Basins in Deqin-Weixi Area and Their Response to Tectonic Activities

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 03 Page number: 315-352 Column: Public date: 2023-09-01

Title:: Geomorphic Characteristics of Drainage Basins in Deqin-Weixi Area and Their Response to Tectonic Activities

Author(s):: LIU Jingnan; CHANG Yuqiao; TIAN Peng; LI Sheng; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: Deqin-Weixi area; drainage basin; the hypsometric integral; geomorphic evolution; tectonic activity

CLC:: P315.22

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0033

Abstract:: Deqin-Weixi area,located in the middle south section of the Hengduan Mountains on the southeast margin of the Tibet Plateau,and near the Southwest boundary of the Sichuan-Yunnan rhombic block,is a typical active tectonic area,where plenty of late Quaternary active faults extend.With complex topography and developed water system,this area is an ideal place for researchers to study the response of landform to tectonic activities.Based on the spatial analysis mode of ArcGIS,the hypsometric integral(HI)values of the sub-drainage areas and main secondary drainage areas in Deqin-Weixi area were extracted by using ASTER GDEM 30 m data,and the HI equivalent zoning of 990 sub-drainage areas and HI curves of 12 main secondary drainage areas were obtained.The results show that the HI curves in the Adong River secondary basin,the Dongshui River secondary basin,and the Sanchahe River secondary basin are slightly convex,indicating that the geomorphic evolution of these 3 basins are in the “young” stage.The HI curves in other basins are S-shaped,indicating the geomorphic evolution of these basins are in the “mature” stage.The HI values are high in the north and low in the south of the study area,and the low HI value are roughly distributed along with the extension of active structures,while high HI values are mainly distributed on both sides of the fault zone and in the tectonic intersection area.The tectonic activity is the main controlling factor of the geomorphic evolution in the study area; the geomorphology responds well to the tectonic activity in the study area.Lithology and climate scarcely influence the geomorphology in the study area.

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Last Update: 2023-06-25