Tracking annual changes of coastal tidal flats in China during 1986-2016 through analyses of Landsat images with Google Earth Engine
Tracking annual changes of coastal tidal flats in China during 1986-2016 through analyses of Landsat images with Google Earth Engine
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通过Google Earth Engine分析Landsat图像追踪1986-2016年中国沿海滩涂的年度变化
DOI：
10.1016/j.rse.2018.11.030
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发表时间：
2020
影响因子：
13.5
通讯作者：
Li Bo
中科院分区：
文献类型：
--
作者：
Wang Xinxin;Xiao Xiangming;Zou Zhenhua;Chen Bangqian;Ma Jun;Dong Jinwei;Doughty Russell B.;Zhong Qiaoyan;Qin Yuanwei;Dai Shengqi;Li Xiangping;Zhao Bin;Li Bo
潮滩（无植被区）与海岸植被区沿着，构成高潮线和低潮线之间的海岸湿地（潮间带），在野生动物、生物多样性和生态地球化学循环中起着重要作用。然而，近几十年来，中国沿海滩涂的精确年分布图还没有得到，其时空变化也不清楚。在这项研究中，我们分析了所有可用的Landsat TM/ETM+/OLI图像（约44，528张图像），使用Google Earth Engine（GEE）云计算平台和一个强大的决策树算法来生成开阔地表水体和植被的年度频率图，以生成1986年至2016年30米空间分辨率的中国东部沿海滩涂的年度地图。2016年的沿海滩涂地图使用谷歌地球中提供的高分辨率图像进行了评估。2016年中国沿海滩涂总面积约为731，170公顷，主要分布在黄河三角洲和珠江三角洲周边省份。近30年来中国沿海滩涂面积的年际变化可分为3个时期：1986-1992年为稳定期，1993-2001年为增长期，2002-2016年为减少期。由此产生的年度沿海滩涂地图可用于支持可持续沿海区管理政策，以保护中国沿海生态系统服务和生物多样性。
Tidal flats (non-vegetated area), along with coastal vegetation area, constitute the coastal wetlands (intertidal zone) between high and low water lines, and play an important role in wildlife, biodiversity and biogeochemical cycles. However, accurate annual maps of coastal tidal flats over the last few decades are unavailable and their spatio-temporal changes in China are unknown. In this study, we analyzed all the available Landsat TM/ETM+/OLI imagery (~44,528 images) using the Google Earth Engine (GEE) cloud computing platform and a robust decision tree algorithm to generate annual frequency maps of open surface water body and vegetation to produce annual maps of coastal tidal flats in eastern China from 1986 to 2016 at 30-m spatial resolution. The resulting map of coastal tidal flats in 2016 was evaluated using very high-resolution images available in Google Earth. The total area of coastal tidal flats in China in 2016 was about 731,170 ha, mostly distributed in the provinces around Yellow River Delta and Pearl River Delta. The interannual dynamics of coastal tidal flats area in China over the last three decades can be divided into three periods: a stable period during 1986–1992, an increasing period during 1993–2001 and a decreasing period during 2002–2016. The resulting annual coastal tidal flats maps could be used to support sustainable coastal zone management policies that preserve coastal ecosystem services and biodiversity in China.