Study on the dynamic change of water in Central Asia based on Landsat-TM imagery
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Abstract:
At present, with the rapid development of remote sensing and image processing technologies, using remote sensing data for analyzing and monitoring water resources has become an inevitable trend. The five Central Asian countries are located at the core of Eurasia, and are considered as a stronghold of the "Silk Road" economicbelt . They have little rainfall all the year round, and differ greatly in water area. Based on Landsat-TM/ETM+ imagery , using the method of decision tree classification, we extracted the information of Central Asian water, and selected the major lakes and canals of Central Asia as the typical research areas to study the change of water area in 2000, 2010, and 2015. The results demonst rated that the total water area of Central Asia is 123 984. 80 km2 , which includes 111 856 km2 of lake area, 6 323.59 km2 of river area, and 5804.58 km2 of pond area. These three types respectively accounted for 90.21% , 5.10% , and 4.68% of the total water area. In addition, while Uzbekistan has abundant water resources, the other countries in Central Asia are all relatively short of water resources. Among the typical areas, the Aral Sea, Irtysh River, and Ural River have large coefficients of deterioration, which are 41.18% , 24.82% , and 14.68% respectively. Generally, the water area is decreasing year by year in Centr al Asia. The study on the distribution and dynamic change of water resources in Central Asia can contribute to "The Belt and Road" strategy .
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