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摘要: 通过对1987、1993、1999、2006和2010年5个时相的Landsat卫星遥感数据分析,利用适合长江口岸线演变研究的遥感波段组合,获得了长江口南北两岸20多年来岸线演变的信息,结果表明,1987-2010年期间,研究区内岸线的总长度由526.7 km增长到579.7 km,高潮线以上陆地面积增加541.48 km2,其中,以海门市的南部海岸、崇明岛北岸和东岸、浦东新区的东部岸段以及长兴岛北部和横沙岛东部岸段变化最为明显,并且它们以不同的速度向海淤进。20多年来,造成岸线变化的原因有长江输沙、港口建设和围填海工程建设。今后应密切关注长江口岸线的变化,了解其变化规律,预测其未来变化的趋势。Abstract: Based on the remote sensing data of the five phases in 1987, 1993,1999,2006 and 2010 respectively, and using the optimum spectral composition of the images, the evolution of northern and southern coastlines of the Yangtze estuary over 20 years was revealed, The image interpretation showed that the coastline in the research area increased from 526.7 km to 579.7 km and the area expanded by 541.48 km2 during 1987 to 2010. Obvious changes were found in the five parts of the estuary, i.e. the southern coast of Haimen, the northern and eastern coast of the Chongming Island, the eastern coast of the Pudong New Area, the northern coast of the Changxing Island and the eastern coast of the Hengsha Island, where coastlines prograded towards the sea with different speeds. These changes of coastline were mainly from the change in sediment discharge into the estuary and the influence of construction of large ports and reclamation projects.
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Key words:
- satellite remote sensing /
- coastline evolution /
- Yangtze estuary
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