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首页> 外文期刊>Chemical geology >Historical Shoreline Mapping: Application of the Digital Shoreline Analysis System to the Evolution of Worthing Beach, Barbados, Following Hurricanes Allen (1980) and Ivan (2004)
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Historical Shoreline Mapping: Application of the Digital Shoreline Analysis System to the Evolution of Worthing Beach, Barbados, Following Hurricanes Allen (1980) and Ivan (2004)

机译：历史海岸线测绘：数字海岸线分析系统在飓风艾伦（1980）和Ivan（2004）之后的巴巴多斯沃巴多斯沃巴多斯沃巴多斯沃迪斯海滩演变中的应用

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摘要

This paper examines the application of the Digital Shoreline Analysis System (DSAS), developed by the U.S. Geological Survey, to a test site at Worthing Beach, Barbados. The system calculates shoreline rates-of-change statistics from historical shoreline positions by casting transects perpendicular to a common baseline and observing where each transect intersects with beach width. DSAS was applied using four historical aerial photographs (1973, 1982, 1991, and 2004) to project its 50 year trend (1973-2023). Following the impact of Hurricane Allen (1980), Worthing Beach, contrary to expectations, exhibited a rapid accretion rate of 7.0 m/y. Subsequently, the passage of Hurricane Ivan (2004) led to the removal of approximately 110 m of shoreline while the hurricane impacted the island. The linear methodology used by DSAS, however, projected continued accretion over the central spur up to the base of the coral rubble reef within the nearshore, which was in contrast to the actual shoreline trend. It was hypothesized that both rapid accretion and erosion were initiated by changes in the height of the coral rubble reef introduced by each of the hurricanes, respectively. The statistical projections were used to assess the accuracy of the computed shoreline positions prior to the implementation of engineering works in 2006 by the Barbados Coastal Zone Management Unit, since erosion continued to threaten infrastructure along the back beach long after Hurricane Ivan (2004). It was concluded that it is essential to identify the underlying causes of accretion and erosion to assist in designing any engineering interventions.
机译：本文介绍了由美国地质调查开发的数字海岸线分析系统（DSA）的应用，以胜利海滩，巴巴多斯的试验场。该系统通过浇注垂直于常见基线的横断波和观察与海滩宽度相交的横断管来计算来自历史海岸线位置的轮船率统计数据。使用四个历史航空照片（1973,1982,1991，2004年）使用四个历史航空照片（1973-2023）来应用DSA。飓风艾伦（1980年）的影响，符合预期的值得胜利的海滩，表现出7.0米/亩的快速增量率。随后，飓风Ivan（2004）的通过，在飓风影响岛上的同时，去除约110米的海岸线。然而，DSA使用的线性方法将在近岸珊瑚碎片礁的基础上预计持续增加，这与实际的海岸线趋势相反。假设，通过分别由每个飓风引入的珊瑚碎片珊瑚礁的高度的变化来启动快速增生和腐蚀。统计投影用于评估2006年沿海地区管理部门在2006年实施工程工程之前计算的海岸线职位的准确性，因为侵蚀在飓风IVAN（2004年）后沿着后海滩继续威胁基础设施。得出结论是，必须识别增生和侵蚀的根本原因，以协助设计任何工程干预措施。

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