基于长时间序列遥感影像的查干湖水体面积变化分析

Analysis of water area change in Chagan Lake based on long period remote sensing data

利用Landsat5、Landsat7和Landsat8遥感卫星影像,选取1991年至2021年间6月份影像共计19张,分别使用NDWI水体指数法和SVM分类方法,对查干湖主体区域进行水体面积变化监测,并结合松原市2000年至2020年年平均气温和年累计降水数据动态分析查干湖主体水域面积变化。结果显示查干湖水体面积整体呈现减少趋势,面积最大值出现在1994年6月13日,面积最小值出现在2021年6月15日。1991年至2009年间,查干湖水体面积整体呈现增加趋势,2010年至2021年,查干湖水体面积整体呈现减少趋势。查干湖水体面积变化与松原市年平均气温呈反比,与松原市年累计降水量呈正比。

Using Landsat5,Landsat7 and Landsat8 remote sensing satellite images,19 images in June were selected from 1991 to 2021.NDWI water index method and SVM classification method were used to monitor the change of water area in the main areas of Chagan Lake,and the dynamic analysis of the water area change was further conducted in combination with the annual average temperature and annual accumulated precipitation data of Songyuan City from 2000 to 2020.The results show that the water area of Chagan Lake displays a decreasing trend,with the maximum area appearing on June 13 of 1994 and the minimum area appearing on June 15 of 2021.From 1991 to 2009,the water area of Chagan Lake showed an overall increasing trend,whereas from 2010 to 2021,the water area of Chagan Lake showed an overall decreasing trend.The water area change in Chagan Lake is inversely proportional to the annual average temperature of Songyuan City,and directly proportional to the annual accumulated precipitation of Songyuan City.