基于Landsat卫星数据的洪湖水体遥感监测研究

2011年洪湖遭遇了70 a一遇的干旱，湖区水体面积发生了明显的变化。为了解影响洪湖水体面积变化的因素，利用1973年以来的多期Landsat卫星遥感图像数据，提取洪湖湖区水域面积，结合同期逐月日平均降雨量数据，对洪湖水体面积变化进行了探讨。分析表明：洪湖水体面积呈下降趋势；1973~2000年洪湖水体面积和年降雨量数据、汛期降雨量数据的相关性都很高，水体面积的变化趋势和年降雨量的变化趋势基本一致；而1973~2010年洪湖水体面积和年降雨量数据、汛期降雨量数据的相关性都有所降低，说明2000年后，影响洪湖水体面积的因素可能存在降雨量之外的其他因素，具体情况还有待进一步深入研究。

Research on remote sensing surveillance of water body in Honghu Lake based on Landsat satellite data

A 70-year-frenquency drought hit Honghu Lake in 2011,and the area of water body in lake region was changed obviously.To find out the influential factors on water area of Honghu Lake,the water area of the lake are extracted and analyzed by using Landsat satellite remote sensing image data since 1973,together with the month-by-month average daily rainfall data for the same period.The results show that water area of Honghu Lake has the decreasing trend.The water area of Honghu Lake has closely relation with annual precipitation,flood season precipitation and the variation trend is consistent with that of annual precipitation from 1973 to 2000;but the correlation of water area of Honghu lake and annual precipitation decreases from 1973 to 2010,which indicates that some other factors influencing the water area of Honghu Lake exist besides rainfall,and further study should be conducted.