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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Global distribution of coastal cliffs
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Global distribution of coastal cliffs

机译：全球沿海悬崖分布

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Previous studies have estimated that coastal cliffs exist on about 80% of the global shoreline, but have not been validated on a global scale. This study uses two approaches to capture information on the worldwide existence and erosion of coastal cliffs: a detailed literature survey and imagery search, and a GIS-based global mapping analysis. The literature and imagery review show coastal cliffs exist in 93% of the combined recognized independent coastal states and non-independent coastal regions worldwide (total of 213 geographic units). Additionally, cliff retreat rates have been quantified in at least one location within 33% of independent coastal states and 15% of non-independent regions. The GIS-based mapping used the near-global Shuttle Radar Topography Mission 3 arc second digital elevation model and Arctic Coastal Dynamics Database to obtain near-global backshore coastal elevations at 1 km alongshore intervals comprising about 1,340,000 locations (81% of the world vector shoreline). Backshore coastal elevations were compared with the mapped distribution of European coastal cliffs to produce a model training set, and this relationship was extended globally to map the likelihood of coastal cliff locations. About 21% of the transects (17% of the world vector shoreline) were identified as mangroves and eliminated as potential cliff locations. The results were combined with estimates of cliff percentages for Greenland and Antarctica from the literature, extending the global coverage to estimate cliff occurrence across 89% of the world vector shoreline. The results suggest coastal cliffs likely exist on about 52% of the global shoreline. (c) 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
机译：以前的研究估计，沿海悬崖存在于全球海岸线的约80％，但尚未在全球范围内验证。本研究采用两种方法来捕获关于沿海悬崖的全球存在和侵蚀的信息：详细的文学调查和图像搜索，以及基于GIS的全球绘图分析。文献和图像综述展示沿海悬崖存在于93％的合并公认的独立沿海国家和全球非独立沿海地区（总共213个地理单位）。此外，克利夫撤退率在独立沿海国家的33％内的至少一个位置，以及15％的非独立区域。基于GIS的映射使用了近全球班车雷达地形任务3 ARC第二数字高度模型和北极沿海动力学数据库，以获得近岸间隔的近全球沿海海拔，包括约1,340,000个地点（81％的世界矢量海岸线） ）。与欧洲沿海悬崖的映射分布相比，沿海沿海海拔生产模型培训集，这一关系在全球范围内延伸，以映射沿海悬崖地点的可能性。约21％的横断面（占世界载体海岸线的17％）被确定为红树林，并被淘汰为潜在的悬崖地点。结果与来自文献的格陵兰岛和南极洲的悬崖百分比估计相结合，扩大了全球覆盖范围，以估算89％的世界向量海岸线的悬崖发生。结果表明沿海悬崖可能存在于全球海岸线的约52％。 （c）2018作者。 John Wiley＆Sons Ltd.出版的地球表面流程和地貌

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