博鳌珊瑚岛围填导致邻近海岸侵蚀、淤积演变的研究  

A study on the erosion and siltation evolution of the neighboring coast caused by the enclosure of Boao Coral island

作　　者：符国伟 宋艳伟 袁坤 王照翻 傅开哲 FU Guo-wei;SONG Yan-wei;YUAN Kun;WANG Zhao-fan;FU Kai-zhe(Haikou Research Center of Marine Geology,China Geological Survey,Haikou 571127,China)

机构地区：[1]中国地质调查局海口海洋地质调查中心,海南海口571127

出　　处：《海洋环境科学》2022年第2期174-179,共6页Marine Environmental Science

基　　金：中国地质调查局地调项目(DD20208012)。

摘　　要：通过对海南琼海市博鳌镇珊瑚岛岸线侵蚀淤积野外调查、岸滩剖面监测、岸线遥感解译监测、定点海流观测等,本文分析了1985年以来珊瑚岛附近海岸侵蚀淤积演变,初步探讨了珊瑚岛岸线的形成机理。珊瑚岛岸段总体呈现水道淤积、水道南北两侧侵蚀的现象,自2011年珊瑚岛修建后,侵蚀淤积现象显著加剧,最大年平均侵蚀和淤积距离分别约55.6 m/a和10.2 m/a,较修建前分别增长了约22倍和5倍。2020年岸滩剖面监测数据表明:珊瑚岛季节性常规天气和台风天气均出现侵蚀淤积现象,台风过境后,南北岸段侵蚀淤积变化量分别增大2倍和6倍。珊瑚岛围填改变了区域水动力,与台风等极端天气影响叠加,波浪冲刷南北岸段松散岸滩,加剧侵蚀,增加沿岸悬沙浓度,并在珊瑚岛西侧水动力较弱的波影区,堆积形成中间淤积漫滩。Through the field survey of the coastline erosion and deposition of the Coral island in Boao town,Qionghai city,and the shoreline profile monitoring,coastline remote sensing interpretation,as well as thefixedpoint observation of the currents,the evolution of coastal erosion and deposition near the Coral island since 1985 was analyzed,also the formation mechanism of coastline was preliminarily discussed.The section of Coral island showed deposition in the entrance and erosion at the north and south sides of the channel.Since the construction of the Coral island in 2011,the erosion and siltation processes have increased significantly.The maximum annual average erosion and deposition rates are about 55.6 m/a and 10.2 m/a,respectively.It's increased by about 22 times and 5 times comparing with that before construction,respectively.The monitoring data of the beach profile in 2020 showed that both of Coral island's normal seasonal weather and typhoon affected the erosion and deposition processes.After the typhoon event,the amount of erosion and deposition on the north and south shores had increased by 2 times and 6 times,respectively.The reclamation of the Coral island had caused changes in regional hydrodynamics,which was superimposed with the extreme weather like typhoon.The waves flushed the loose parts of the north and south coastline,which increased the coastal suspended sand concentration,weakened the hydrodynamic condition around the west domain of the Coral island,andformed the middle deposition area.

关 键 词：琼海博鳌 海岸侵蚀淤积 围填岛 演变 机理分析 

分 类 号：P737.1[天文地球—海洋地质] X87[天文地球—海洋科学]