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A study of the variation and driving factors of the water area of the terminal lake of inland river: A case study of Taitema Lake region |
HUO Tianci1( ), YAN Wei2( ), MA Xiaofei1,3 |
1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China 2. School of Geographic Sciences, Xinyang Normal University, Xinyang 464000, China 3. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Terminal lake, which is an important part of oasis ecosystem in the lower reaches of inland river in arid region, has the functions of water conservation, wind prevention and sand fixation. However, for nearly half a century, the terminal lake of inland river has been shrinking under the influence of climate change and human activities, and the ecological environment around the lake has been deteriorating, which has seriously threatened the regional social development. In order to explore the changes and driving factors of the water area of the terminal lake in the arid region, this paper took the Taitema Lake region as an example, selected nine Landsat TM/OLI remote sensing images from 1986 to 2019, and extracted and analyzed the change characteristics and driving factors of the water area of the Taitema Lake region. The results showed that the water area of the study region increased by 163.93 km 2 in the past 34 years. In terms of spatial distribution, water area of the study region was scattered around the lower reaches of Qarqan River before the 21st century, and mainly distributed around Taitema Lake since the 21st century. The center of gravity of the water area in the study region experienced four processes: rapid westward shift in the late 1980s, slow eastward shift in the 1990s, rapid eastward shift in the late 1990s to early 2000s, and eastward shift in the fluctuation since the 21st century. Taking the water transport to the lower reaches of Tarim River as the boundary, the water area before water transport is mainly affected by the comprehensive effects of regional natural factors, with precipitation as the main driving factor (r 2=0.825). After water transport, the water transport process with human intervention is the leading factor (r 2=0.977) affecting the change of water area in the study region. With the continuous water transfer to the downstream of Tarim River, the ecological environment of Taitema Lake has been restored continuously. In order to prevent the lake from overflowing and spilling eastward into Lop Nor, it is necessary to explore the maximum water capacity of Taitema Lake so as to reasonably control the water transfer.
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Keywords
terminal lake
Taitema Lake
water area change
ecological water transport
remote sensing
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Corresponding Authors:
YAN Wei
E-mail: huotianci2@163.com;jw@xynu.edu.cn
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Issue Date: 09 October 2020
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