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《Arid Land Geography》 2018-05
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Geomorphological pattern and its change of aeolian landform in Dingjie area of Tibet from 1996 to 2016

MA Jian-jun;PAN Mei-hui;WU Yong-qiu;XUE Wen-xuan;College of Geography and Environment Science,Northwest Normal University;Open Research Laboratory of Environmental Changes and Natural Disaster of State Education Commission,Institute of Resource Sciences,Beijing Normal University;Faculty of Geographical Science,Beijing Normal University;  
In this paper,we took the Dingjie area,Tibet,China,as the study area,used the Landsat4-5 TM,MSSS,Landsat7 ETM,Landsat8 OLI data sets as well as the field observation data in 2016 and 2017. The geomorphologic types and distribution characteristics of the aeolian landform,as well as the change trends,were analyzed using the geographic information tools such as ENVI and GIS combined with GoogleEarth for the visual interpretation of remotely sensed image data,the calculation of annual conversion rate and the analysis of transfer matrix. It is concluded that the change of aeolian landform geomorphological pattern is a positive response to the climate change,which is the main reason for the change. In Dingjie area,the climbing dune,the coppice dune on the valley slope,the crescent dune,the flat sand land and the coppice dune on the valley bottom are mainly distributed like strips in the broad sections of the valleys along the Pengqu,the Xilinzangbu,Yeruzangbu,the Jilongzangbu,and the Quqiangzangbu River. At the same time,there are small dunes distributed sporadically around the lakes including Dengmu Lake,Qiangzuo Lake,Gongzuo Lake and Cuomuzhelin Lake. From 1996 to 2016,the geomorphological pattern of aeolian landform in the Dingjie area was expanded first and then reduced. The area of moving dunes was decreased,while the area of fixed dunes,the semi-fixed dune and the coppice dune was increased. The transition direction is mainly from moving dune to fixed dune,semi-fixed dune and the coppice dune. The characteristics and direction of this change confirmed the trend of climate warming and wet in Qinghai-Xizang Plateau. This study enriches the research contents of aeolian landforms in Dingjie area and provides a theoretical reference for the study of wind-sand geomorphology and the control of wind-sand.
【Fund】: 国家重点基础研究发展计划项目课题(2013CB956001);; 国家自然科学基金重点项目(4133074)
【CateGory Index】: P931.3
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