近40年天津市大陆海岸线时空变迁分析

Spatial-temporal Changes of Tianjin Continental Coastline in the Past 40 Years

基于GIS和遥感技术,辅助海域使用权属数据,采用人机交互的方式提取了天津市近40年海岸线变迁信息.结果显示:天津市大陆海岸线在20世纪变化较为平缓;进入21世纪,由于国家政策的引导,天津市海域开发利用强度的加大,交通运输、临海工业、滨海旅游、城镇建设等用海项目沿海岸线大面积分布,在带动天津市海洋经济发展的同时,海岸线变化加大;到2012年后海岸线增长趋缓,2014—2016年海岸线趋于稳定.这表明天津市有必要开展大陆海岸线修测,并加强海岸线保护与利用管理.

Based on the technology of GIS and RS,and assisted by the data of sea area use,this study extracted the coastline changing information of Tianjin in the past 40 years by means of human-computer interaction.The results show that the coastline of Tianjin changed more slowly in the 20th Century.From the beginning of 21st century,under the guidance of national policies,the development and utilization intensity of Tianjin sea areas increased due to more and more large-scale coastal projects mainly related to transportation,industry,tourism and urban construction,which helped the development of Tianjin’s marine economy,and also led to more changes of the coastline.The coastline growth slowed down after 2012 and the coastline became stable from 2014 to 2016,which shows that it is necessary for Tianjin to carry out surveys and reconstructions of the coastline,so as to strengthen the protection and utilization management of the coastline.