近20年鄱阳湖水体面积变化遥感监测与分析

Remote Sensing Monitoring and Analysis of Poyang Lake Water Area Changes over the Past 20 Years

利用卫星遥感影像数据,应用归一化水体指数法和谱间关系法,定量化分析2002—2019年鄱阳湖水体面积变化规律并探究其变化原因。研究表明,1)2002—2019年鄱阳湖水体面积整体呈现缩小趋势,水体面积年内季节变化明显,丰水期与枯水期水域面积相差1倍以上,且该差值近年来有增大趋势。2)通过分析鄱阳湖星子站水位发现,鄱阳湖进入枯水期日期较历史明显提前。3)分析极端干旱和夏季洪涝事件发现,鄱阳湖水域面积与江西省降水量有较明显的正相关性。

Based on the remote sensing image data(MODIS,FY series)over the past 20 years(2002 to 2019),the variation characteristics of Poyang Lake area and the causes were discussed quantitatively using the method of normalized water index and the law of the spectrum relevance.The results showed that the overall water area of Poyang Lake presented a decreasing trend and obvious seasonal variations.The difference between the water area of Poyang Lake during the wet period and dry period was more than twice,which was increasing in recent years.The occurrence date of dry season over the past 20 years was significantly earlier than that of history based on the analysis of the water level observed at Xingzi station.The water area of Poyang Lake and the precipitation of Jiangxi province exhibited a significant positive relationship by the analysis of extreme drought and summer flood events.