摘要
海岸线作为海洋与陆地的分界线,长期受到全球和区域环境变化的影响及人为活动的改造,是典型的生态脆弱带。通过开展海岸线变化特征及驱动因素的研究,掌握岸线利用现状及发展趋势,对海岸资源的开发、利用与保护具有重要意义。本文以海南省海口市江东新区及邻区为例,基于Landsat数据,提取了该区域1987—2018年8个时期的海岸线数据,并对其31年来的时空变化特征进行了系统分析。结果表明:(1)31年来江东新区及邻区海岸线时空变化显著,呈现出“减少—增长—稳定”的演变历史,岸线总长度净增加1.52 km。(2)岸线类型多样性降低,单一性较显著,其中人工岸线增加了61.83 km,增长速率为1.99 km/a;陆海格局变化特征复杂,整体呈向海扩张的态势。(3)20世纪末的快速发展对海岸线影响较大,港口码头与人工岛建设、围填养殖等活动使研究区生物岸线、砂质岸线等自然岸线受到改造。人为因素已成为海口市江东新区及邻区岸线不断变化的主要驱动力。
As the dividing line between sea and land,the shoreline has been affected by global and regional environmental changes and modified by human activities,which is a typical area with fragile ecology.Through the research on the characteristics and drivers of shoreline change,it is important to grasp the current situation and development trend of shoreline utilization for the development,utilization and protection of coastal resources.Based on Landsat data,remote sensing images were interpreted to acquire data of 8 periods about coastline of Jiangdong New Area and its adjacent region of Haikou City in Hainan Province from 1987 to 2018,of which spatial and temporal change characteristics over the past 31 years were systematically analyzed.The results show that:(1)The spatial and temporal changes of the shoreline in Jiangdong New Area and its adjacent region over the past 31 years are significant,showing a development trend of"decrease-growth-stability",with a net increase of 1.52 km in the total length of the shoreline.(2)The diversity of shoreline types decreases and the singularity is more significant,among which the artificial shoreline increases by 61.83 km with a growth rate of 1.99 km/a,and the land-sea pattern changes with complex characteristics and the overall trend of seaward expansion.(3)The rapid development at the end of the 20th Century has a large impact on the shoreline,that the activities such as the construction of port terminals and artificial islands,and impoundment farming led to the modification of the natural shorelines as biological shoreline and sand shoreline in the study area.Human factors have become the main driving forces of the changing shoreline in Jiangdong New Area and its adjacent region of Haikou City.
作者
朱晓宇
张彦鹏
ZHU Xiao-Yu;ZHANG Yan-Peng(Wuhan Center,China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,Hubei,China)
出处
《华南地质》
CAS
2023年第1期127-137,共11页
South China Geology
基金
中国地质调查局项目(DD20190304)。
关键词
海岸线变化
遥感
江东新区
海南岛
shoreline change
remote sensing
Jiangdong New Area
Hainan island
