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基于格拉丹东区域的MSS数据(1973年)、TM数据(1992年)、ETM数据(2004年和2009年)以及DEM数据,选取非监督分类法提取了四期冰川分布图,详细分析了格拉丹东区域冰川面积、冰川冰缘线、湖泊面积等变化特征。结果表明:1973年以来的近四十年间,研究区冰川总面积减少95.33km2,年均减少2.65km2;冰川消减速度从1973年到2004年逐年增大,2004年以后消减速度趋缓;由于冰川面积减少,冰缘线不断上升,冰川下游湖泊面积增大。
Based on the MSS data (1973), TM data (1992), ETM data (2004 and 2009) and DEM data from the Geladan East region, the four glacier distributions were extracted by using unsupervised classification method, Area glacier area, glacier ice margin, lake area and other changes. The results show that in the recent 40 years since 1973, the total area of glaciers in the study area has decreased by 95.33km2, with an annual average decrease of 2.65km2. The reduction rate of glaciers has been increasing year by year from 1973 to 2004, and the reduction has slowed down since 2004; Area decreases, the ice margin line is rising, the glacier lakes area increases.