基于遥感的辽河口岸线动态变化及成因分析

Dynamic change and cause analysis of Liaohe Estuary bank line based on remote sensing

受人类活动和全球气候变化影响,河流入海口区域成为地表生态系统最脆弱地带。以美国国家航空航天局提供1986、1997和2008年Landsat ETM+影像及2017年Landsat OLI影像为数据源,基于目视解译法和谱间关系法,提取辽河口地区及部分河道岸线信息并分析其时空变化特征。研究表明,辽河口岸线经侵蚀-扩张-侵蚀过程,上游河道向两岸扩张,河道内部出现多个河心岛,主要为辽河口各种工程项目开展等人类活动所致。

Affected by human activities and global climate change, the river estuary area is the most vulnerable area of the surface ecosystem, which is one of the important areas for human survival and development. Based on the Landsat ETM+ images of 1986, 1997 and 2008 and Landsat OLI images of 2017 provided by NASA, the coastline information of Liaohe Estuary and some river channels was extracted and analyzed based on the visual interpretation and spectral relationship. The results showed that the coastline of Liaohe Estuary was in the process of erosion, expansion and erosion,the upstream channel expands to both banks, and there were many River Center islands in the channel.The reason was mainly due to various engineering projects and other human activities carried out in Liaohe Estuary.