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基于混合像元分解法,利用Landsat卫星遥感数据提取红碱淖湖面面积,监测36 a来红碱淖湖面面积的动态变化。结果表明,1973—2009年红碱淖湖面面积总体减小19.7 km2,变化率为-34%。20世纪70年代,湖面面积较大且变化率较小,1974年湖面面积最大,为59.97 km2;80年代湖面面积开始大幅减小,变化率为-12.4%;90年代湖面面积缩小变慢,变化率为-10.6%;21世纪初,湖面面积萎缩迅速加快,变化率达-16.6%,2009年湖面面积仅为38.33 km2。2001—2002年内湖面面积变化情况监测表明,3—5月湖面面积较大,6—11月湖面面积逐渐缩小。2001年11月到2002年3月,湖面面积处于增大期,变化率为+2.2%;2001年5—11月、2002年3—11月面积缩小,变化率分别为-4.4%、-4.1%。
Based on the mixed pixel decomposition method, Landsat satellite remote sensing data were used to extract the surface area of Hongjiangyan Lake and monitor the dynamic change of the area of Hongjiangyan Lake over the 36-year period. The results show that the total area of Lake Rhineosides decreases 19.7 km2 from 1973 to 2009, with a rate of change of -34%. In the 1970s, the area of the lake was larger and the rate of change was smaller. The area of the lake was the largest in 1974, 59.97 km2. The area of the lake began to decrease drastically in the 1980s with a rate of change of - 12.4%. In the 1990s, the area of the lake surface decreased slowly and changed The rate of change was -16.6%. In 2009, the lake surface area was only 38.33 km2. According to the survey of the storage of the lake from the year of 2001 to 2002, the area of the lake from March to May was more than that of the lake Large, June-November the area of the lake gradually reduced. From November 2001 to March 2002, the lake area was in an increasing period, with a rate of change of +2.2%; from May to November in 2001 and from March to November in 2002, the area was reduced and the rates of change were -4.4% and -4.1% respectively %.