苏北大型湖泊水域的EOS/MODIS遥感监测

EOS/MODIS Remote-Sensing Monitoring of Large Lakes over Northern Jiangsu Province

为了从宏观上了解江苏省境内主要湖泊水体的动态变化及原因,并为有关部门指挥防洪抗旱和治理水环境提供准确的决策依据,利用2005年夏季多景EOS/MODIS卫星遥感影像数据,对入夏以来苏北地区主要湖泊水域——骆马湖、洪泽湖、高邮湖(含邵伯湖)进行了卫星遥感动态监测,生成3通道合成彩色图像,运用阈值法提取湖泊及其周边水域的水体边界,并计算水体面积。最后从气象因素对湖泊的水体面积变化进行了分析。遥感图像与面积统计数据直观地反映出,2005年入夏以来苏北各大湖泊水域的水体面积随着前期干旱和其后大量降水的发生而出现比较明显的减小和增加,可见一段时期内的日照时数、降水量等气象因子会对湖泊及周边水域的面积增减产生很大影响。

In order to understand of the dynamical changes and causes of the main lakes over Jiangsu Province to provide the accurate references for flood/drought and water environment control departments in decision-making, the dynamical remote sensing of the lakes over the northern Jiangsu Province was conducted by means of the EOS/MODIS satellite dataset in summer of 2005. The three-channel colorized synthetic images are obtained, and the water borderlines of these lakes are extracted with the threshold method. An analysis is made of the area variation of the lakes from the viewlpoint of meteorology. It can be seen from the remote sensing images and the statistical results that the areas of the lakes decreased because of the previous drought and then increased because of the subsequent abundant precipitation. The meteorological factors such as sunshine duration, precipitation, etc,, have great influence on the areas of lakes.