以江苏盐城海岸为研究区,以2006年、2008年、2009年三景空间分辨率为10m的卫星影像为数据源,研究影像上提取海岸线、平均高潮线和平均低潮线的方法,以此分析港口/围海造田等受人类活动影响岸段的演变特征.研究结果表明:1)与低分辨率的遥感影像相比,高分辨率影像可以提取出地物更细微的特征,因此可以根据高潮时水陆分界上留下的地物特征提取出平均高潮线；2)结合影像当天的潮位资料,根据平均高潮线、影像上瞬时水边线、平均低潮线三者之间距离与时间的线性关系定出平均低潮线；3)从得到的平均高潮线、平均低潮线可以看出,2006年后平均高潮线每年都在不断淤涨,而且淤涨的幅度在增加.平均低潮线2006-2008年处于动态平衡状态,2008-2009年平均冲刷了840 m,变化非常明显.%Methods for extracting information about coastline, mean high tide line and mean low tide line from satellite images are investigated based on the satellite images which have a spatial resolution of 10 m and were obtained in the coastal area of Yancheng of Jiangsu Province in 2006, 2008 and 2009, respectively. On the basis of these studies, the evolution of the coastal sections influenced by human activities such as harbor construction and sea reclamation for farming is analyzed. The results show that (1) comparing with the low-resolution remote sensing images, the high-resolution images can be used to extract more subtle culture features, from which the mean high tide line can be extracted; (2) by combining with the tide level of the day and based on the high tide line extracted already, the instantaneous water edge on the images and the leaner relationship among them, the mean low tide line may possibly be worked out; (3) it has been seen from the results obtained by the above methods that the mean high tide line in the study area has been being in an accretion state since 2006, with an increasing magnitude every year, while the mean low tide line was in a dynamic balance state from 2006 to 2008, but was eroded by 840 m from 2008 to 2009, being very distinct in its change.
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