Study on Evolutions of Lakes Along the Qinghai-Xizang Railway and the Minimum Distance from Lakes to the Railway
Affected by global climate change,lakes on the Qinghai-Xizang Plateau have undergone drastic changes in recent years.Understanding the characteristics of lake evolution and their driving factors is of great significance for the protection of major engineering facilities along the lakeshore.Based on Landsat remote sens-ing images,area data,and water level observation data of Qinghai Lake and Lake Cuona,this study conducted a detailed investigation into the evolution of the two lakes and their minimum distances from the Qinghai-Xizang Railway.Furthermore,by integrating the China Meteorological Forcing Dataset(CMFD)with high spatiotempo-ral resolution ground meteorological elements and meteorological data from meteorological stations,the main meteorological factors influencing water level changes in the two lakes were revealed.The results show:(1)From 1956 to 2004,Qinghai Lake exhibited a shrinking trend.After reaching their lowest values in water level and area in 2004,Qinghai Lake began to gradually increase.During the period from 2004 to 2020,the an-nual average growth rate of water level was 0.20 m·a-1,and the annual average growth rate of area was 19.20 km2·a-1.The water level of Lake Cuona from 2000 to 2018 and the area from the 1970s to 2022 showed slight fluctuations.The maximum interannual fluctuation values of water level and area were 0.60 m and 9.98 km2,respectively.(2)From 1990 to 2022,the minimum distance between Qinghai Lake and the Qinghai-Xizang Railway first increased and then decreased.After 2004,the minimum distance between them decreased at a rate of 19.6 m·a-1,reaching 74.3 m by 2022.The change trend in the minimum distance between Lake Cu-ona and the Qinghai-Xizang Railway from 2004 to 2022 was not significant,reaching 32.3 m by 2022.(3)The water level changes of Qinghai Lake are influenced by wind speed,annual precipitation,downward shortwave radiation,downward longwave radiation,and specific humidity,with contributions of 38％,24％,20％,14％,and 4％respectively.The water level changes of Lake Cuona are mainly influenced by precipitation,with other meteorological factors showing no significant correlation with water level changes.
Lake QinghaiLake CuonaQinghai-Xizang Railwayarea variationwater level variationcorre-lation analysis
万方数据
维普
