浙江省近50年大陆海岸线时空变迁分析

Temporal and Spatial Changes of Continental Coastline in Zhejiang in Recent 50 years

文章选取了1970-2018年近50年间具有代表性的6期Landsat、SPOT-5和GF-1卫星遥感影像,运用数字岸线分析系统,综合利用面积法、基线法等分析浙江省大陆岸线变迁,对岸线变化驱动力进行了分析。结果显示:(1)海岸线变化主要发生在杭州湾、象山港、三门湾、台州湾、乐清湾和瓯江口岸段,海岸线向海推进共围填海约14.77万hm~2,海岸线的平均变化率为26.72m/a。(2)近50年来,浙江省大陆岸线呈明显递减趋势,海岸线减少了184.27 km,自然岸线减少了381.37 km,人工岸线增加了197.10 km。(3)浙江省大陆海岸线以人工岸线为主,人工岸线截弯取直,平直化严重,自然岸线保有量逐年降低。(4)围海养殖、围填海等人类活动是浙江省大陆海岸线变迁的主要驱动力因素。

This paper selected six representative Landsat,SPOT-5 and GF-1 satellite remote sensing images in the past 50 years between 1970 and 2018.The digital shoreline analysis system was used to analyze the change of continental shoreline in Zhejiang Province by using the area method and the baseline method.Besides,the driving force of shoreline change was also analyzed.The results showed that:(1)The seaward extension of the shoreline mainly occured in Hangzhou Bay,Xiangshan Port,Sanmen Bay,Taizhou Bay,Yueqing Bay and Oujiang Port.The reclamation area was 147700 hectares,and the average change rate of coastline was 26.72 m/a.(2)Over the past 50 years,the continental coastline of Zhejiang Province had shown an obvious decreasing trend.The coastline had decreased by 184.27 km while the natural coastline decreased by 381.37 km and the artificial coastline increased by 197.10 km.(3)The continental coastline of Zhejiang Province was dominated by artificial coastline with the serious straightness and the decrease of natural shoreline retention.(4)Human activities such as reclamation and reclamation were the main driving factors of shoreline change.