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通过对福建平潭岛东部岸段软质海崖为期两年的监测,结合历史岸线变化,分析了不同时期的海崖后退变化差异和原因,初步探讨了后退量与影响因素之间关系,得出以下结论:(1)近50 a来研究区海岸蚀退速率呈增大趋势,海平面上升与海崖蚀退率增大之间存在对应关系。(2)软质海崖侵蚀的主要外部影响因素为降水和海洋动力作用,内部因素为海崖抗蚀能力较弱。(3)软质海崖蚀退并非匀速过程,强降水和风暴潮等极端气候作用时期是海崖蚀退最强烈的阶段,侵蚀影响因素的变化也造成蚀退量的差异。(4)软质海崖的蚀退是冲刷、滑坡以及搬运共同作用的结果,海崖蚀退过程可以归结为稳定期,作用期,滑坡期和搬运期4个阶段。
Based on the monitoring of soft sea cliffs in eastern Fujian Pingtan Island for two years and the change of historical shoreline, the paper analyzes the differences and reasons of the sea cliff back-off in different periods, and discusses the relationship between the amount of fallback and the influencing factors, The following conclusions are drawn: (1) The coastal ebb-back rate is increasing in the past 50 years, and there is a corresponding relationship between the sea-level rise and the increase of sea-cliff echoes. (2) The main external influencing factors of soft sea cliff erosion are precipitation and ocean dynamic, and the internal factor is the weak cliff seawall corrosion resistance. (3) Erosion of soft sea cliffs is not uniform, and the periods of extreme climatic effects such as heavy precipitation and storm surges are the strongest stages of sea cliff eroded, and the variation of erosion factors also causes the difference of eroded amounts. (4) Erosion of soft sea cliffs is the result of erosion, landslide and handling together. The process of sea cliff erode can be attributed to four phases: stable period, active period, landslide period and moving period.