Remote Sensing Monitoring Study for the Tendency of Qinghai Lake’s Water Area in Last 41 Years
Abstract: In recent years, affected by global climate change and extreme weather events, the water surface area of Qinghai Lake fluctuates significantly. In order to grasp the variability of Qinghai Lake’s water area so as to provide guidance of basin water resource allocation and eco-environmental protection, remote-sensing images from 1973 to 2013 were used to calculate the water area of Qinghai Lake. Results show that Qinghai Lake’s water area has a tendency to decrease from 1973 to 2004 as a whole; and 2004 was found as a turning point, after which it gradually increases up to the end of the study period. Compared with 1973, the water area reduced 231.4 km2 in 2004 and the difference between 2004 and 2013 is 134.233 km2. Analysis of the meteorological data of the same time period indicates that Qinghai Lake’s water area is affected by the air temperature and sunlight significantly, and it has a weak correlation with rainfall and evaporation. The comprehensive analysis reveals that the rapid increase of the water area of Qinghai Lake since 2004 is mainly due to: 1) the decrease in water loss because of the decrease of temperature, sunlight and wind speed; 2) the increase in rainfall resulting from the acceleration of neighborhood glacier melting; and 3) the increase in vegetation coverage because of the limiting human activities policy.
文章引用: 沈亚文 , 陈华 , 许崇育 (2013) 1973~2013年青海湖水面面积变化遥感动态分析。 水资源研究， 2， 309-315. doi: 10.12677/JWRR.2013.25044
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