风暴后海陵岛金沙滩恢复期床面高度变化分析  

Analysis of bed level elevation during beach recovery after storm on Golden Beach,Hailing Island,Guangdong

作　　者：刘润 李志强 朱道恒 胡鹏鹏 孙琰 曾春华 LIU Run;LI Zhiqiang;ZHU Daoheng;HU Pengpeng;SUN Yan;ZENG Chunhua(College of Chemistry and Environment,Guangdong Ocean University,Zhanjiang 524088,China;College of Electronic and Information Engineering,Guangdong Ocean University,Zhanjiang 524088,China;School of Marine Sciences,Sun Yat-sen University,Zhuhai 519082,China;College of Ocean Engineering,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[1]广东海洋大学化学与环境学院,湛江524088 [2]广东海洋大学电子与信息工程学院,湛江524088 [3]中山大学海洋科学学院,珠海519082 [4]广东海洋大学海洋工程学院,湛江524088

出　　处：《海洋地质前沿》2024年第8期22-31,共10页Marine Geology Frontiers

基　　金：国家自然科学基金(42176167)。

摘　　要：台风后海滩恢复初期的床面变化是海滩演变机理的重要研究内容。利用2021年8月17—22日现场观测获取的海陵岛金沙滩碎波带床面高度和波浪、潮汐数据,分析不同潮汐周期和波况下的床面高度变化特征,并采用连续小波变换分析床面高度的周期变化特征。结果表明:(1)风暴后海滩恢复期的波浪以卷破波为主,在较低潮位与强浪耦合下海滩迅速恢复,而在较高潮位与弱浪耦合下海滩恢复有限;(2)床面高度在“最高潮”时减小,在“次高潮”时增加,“次高潮”期间床面高度的周期变化更显著;(3)床面高程变化受多种水动力参数共同影响,观测点位置不同对潮位变化和波浪作用力反映不同,观测点位于外碎波带,床面高程受深水波高影响较大,在碎波带内受碎波带的波浪、潮位高低以及破碎类型影响较大。The bed surface changes during the initial stage of beach recovery after a typhoon are an important research content for the mechanism of beach evolution.We analyzed the characteristics of the bed level elevation(BLE)change under various tidal cycles and wave conditions using the BLE and wave and tidal data of the surf zone of Golden Beach(Jinshatan,Hailing Island(Yangjiang,Guangdong,South China),which were obtained from field observation from August 17 to 22,2021.We then used continuous wavelet transform to analyze the characteristics of the cycle change of the BLE.The findings are①during the beach's storm-related recovery phase,the majority of the waves are breaking waves,and the beach recovers quickly at low tide when there are powerful waves,while the beach recovers to a limited extent at high tide coupled with weak waves.②The BLE decreases during the"highest tide"and raises during the"sub-highest tide",and the periodic change of BLE during the"sub-highest tide"is more substantial.The beach recovers to a limited extent during high tide combined with weak waves.③Various hydrodynamic factors affect the change in BLE,and the different observation point have different responses to tidal level changes and wave forces.The BLE is more affected by deep-water wave height when observation site is beyond the surf zone,while the wave,the tidal level,and the type of broken waves inside the surf zone are main impact factors on the BLE.

关 键 词：热带风暴 碎波带 床面变化 小波分析 海滩恢复 

分 类 号：P731.2[天文地球—海洋科学]