长兴岛海岸线变化遥感动态监测及分形特征

Analysis of shoreline changes based on remote sensing in Changxing Island,Liaoning Province

基于6个时相的卫星影像和野外实地调查,通过人工目视解译获取了30多年来大连市长兴岛海岸线的变化信息,计算了时间序列上海岸线分形指数的动态变化。结果显示:30多年来长兴岛海岸线受人类活动的影响逐步增大,人类活动影响和改变海岸线的活动可分为两种类型。在1995年之前的近20 a内,以原始淤泥质岸线被垦为人工养殖岸线为主导类型;1995年以后,人工养殖岸线和部分基岩海岸、砂质海岸变为港口和人工护岸岸线的过程是主要类型,尤其在2005年之后,这一变化特征尤为明显。2009年的海岸线分形数远大于历年的海岸线分形数也证明上述趋势。研究表明,海岸线的变化特征反映了长兴岛经济结构的变化过程,在近海养殖业逐年发展的基础上,随着港口和大型临海重工业的建设,长兴岛经济将步入港口化和重工业化的发展阶段。

Six-phase extraction of Changxing Island shoreline was carried on for 30 years based on the Landsat imagery and field investigation,and the analysis of the shoreline change was completed by fractural dimensions indicator.The results showed that： After reform and open in China,Changxing Island shoreline was affected heavily by the human activities.In the two decades prior to 1995,the trend of shoreline change was dominated by the model which original muddy shoreline been reclaimed as artificial breeding shoreline.After 1995,the artificial breeding coastline and part of the bedrock coast,sandy coast in the port into a manual and artificial revetment shoreline,especially,after 2005 the changes were particularly evident feature.The same fractural coastline results also showed these trends.The studies indicated that the changes in the characteristics of the coastline reflected the socio-economic changes in the structure of the process of Changxing Island,offshore aquaculture industry,year by year based on the development,through industrial development and large-scale industrial construction,Changxing Island will enter the port of socio-economic development and re-development stage of industrialization.