摘要
为了研究上海大陆岸线的最新变化,以5年为间隔,选取1988~2019年间的近30年多期Landsat遥感影像,采用多尺度分割和光谱分割相结合的分割方法,提取影像中研究区域的水边线,并利用同年不同时相的水边线和平均大潮高潮位数据进行潮位校正,获取相对准确的海岸线位置。使用线性回归速率方法(LRR)对大陆岸线的外扩距离和速度变化进行了统计,同时对上海大陆岸线长度和面积的时空变化进行了分析。结果表明,从1988~2019年,上海大陆岸线总长度增加了10.4 km,增幅达5.19%,长度变化呈"减增减"的趋势。海岸线的平均外扩距离为1.35 km,平均LRR值为50 m/年,外扩距离最大处位于南汇嘴。上海大陆沿岸总的新增土地总面积达到220.39 km^2。
For researching the changes in recent 30 years,this paper selected Landsat time series data of Shanghai region at five-year intervals from 1988 to 2019,and the approach of multiresolution segmentation and spectral difference segmentation were used to extract the waterlines,then using the waterlines of different periods in the same year and the mean high water springs level to correct the tide level,so as to obtain the accurate coastlines.The LRR(Linear Regression Rate)were used in the paper to analyze the outbound distance and changing speed of the Shanghai mainland coastline.Besides,analysis was made of the spatial-temporal changes in length and areas of Shanghai mainland coastline.The research results showed that during the study period,the entire coastline had been lengthened by 10.4 km,an increase of 5.19%,and the change in length had a tendency of"decreasing-increasing-decreasing".The outbound distance of the coastlines was averaged 1.35 km,with the mean LRR of 50 m/year.Nanhuizui had the largest outbound distance.Due to the coastline changes,the Shanghai area expanded by 220.39 km^2 by 2019,which was an increase relative to its 1988 area.
作者
钱静
栾奎峰
陆雪骏
朱卫东
邱振戈
QIAN Jing;LUAN Kuifeng;LU Xuejun;ZHU Weidong;QIU Zhenge(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;Shanghai Engineering Research Center of Estuarine and Oceanographic Mapping,Shanghai 201306,China;Shanghai Administration Center for Ocean Affairs,Shanghai 200050,China)
出处
《海洋测绘》
CSCD
2020年第5期63-68,共6页
Hydrographic Surveying and Charting
基金
国家重点研发计划(2016YFC1400904)
上海市科委重点科研计划(17DZ1204902,17DZ1204906)
上海市海洋局科研项目(沪海科2019-5,沪海科2020-5)。
关键词
海岸线
时空变换
线性回归速率
潮位校正
多尺度分割
Landsat影像
coastline
spatiotemporal change
tide level correction
linear regression rate
multiresolution segmentation
Landsat images
