Distribution of wetlands and salt lakes in the Yadong region of Tibet based on remote sensing, and their geo-climatic environmental changes  

作　　者：Ang Sun Qing-hua Yang Zhi Liu Hua Chen Lei Han Shou-min Jiang Yue-yue Meng Yu Bian Yong-peng Yang 

机构地区：[1]China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,China Geological Survey,Beijing 100083,China [2]Sichuan Geological Survey Institute,Chengdu 610036,China

出　　处：《China Geology》2022年第4期637-648,共12页中国地质（英文）

基　　金：funded by the China Geological Survey Project(DD20190545 and DD20221824).

摘　　要：Based on the 16 scenes GF-1 satellite multi-spectral remote sensing images,through the adoption of data processing methods including orthorectification,geometric rectification,data fusion and image mosaic,integrated with field surveys,the remote sensing interpretation signs for the inland wetland types have been built,and the remote sensing survey of inland wetlands in Yadong region has been initiated,with six types of inland wetlands recognized in Yadong region,namely permanent rivers,seasonal rivers,lakes,salt lakes,alpine meadows,and inundated land.The spatial distribution characteristics and the spreading rules of these wetlands have also been revealed.Based on full understanding of the overall characteristics of the inland wetlands in the Yadong region,using the three phases of TM images acquired in 1989,2003 and 2008 as well as the PMS2 data gathered by GF-1 in 2014,and the wide-range data(WFV3)gathered by GF-1 in 2020.As to the typical salt lakes,a long-time salt lakes transition study was carried out.The results show that the typical salt lakes in Yadong have been shrinking in the past three decades.The average annual shrinkage of Duoqing Co(Co means lake in Tibetan)was stronger than that of Gala Co,which are respective 87.30 hectares(usually short as ha;1 ha equals to 0.01 km^(2))/a and 24.20 ha/a;the shrinkage degree of Gala Co was higher than that of Duoqing Co,shrank by 59.27% and 35.73% respectively.Based on the remote sensing survey results and an integrated analysis of the predecessors’researchers,the reason for the shrinkage of the salt lakes is more inclined to geological factors.Geological process is manifested by a series of extensional faults at the bottom of the lake basin generated from tectonic activities,providing fluid infiltration channels,and inducing the eventual leakage of lake water to the lower strata.The result provides an important instance for understanding the evolution characteristics of wetlands and salt lakes in specific environment of the Tibetan Plateau.

关 键 词：Yadong WETLANDS Salt lakes Duoqing Co Gala Co Geological survey engineering Tibet Plateau 

分 类 号：P237[天文地球—摄影测量与遥感] P942[天文地球—测绘科学与技术]