首页|"圆规"台风后海口铺前湾沙滩恢复效率与主控因素研究

"圆规"台风后海口铺前湾沙滩恢复效率与主控因素研究

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在台风期间滩肩缩窄和后滨坡度变陡是砂质海滩的重要特征,而在常浪期间海滩剖面的恢复效率与近岸动力-泥沙-地貌的互馈密切相关.本研究基于海南岛铺前湾在超强台风"圆规"前后以及后续常浪恢复期间的海滩剖面实测数据,同时结合XBeach数学模型试验,分析了砂质海滩风暴后的恢复特征与影响恢复效率的主控因素.结果表明:台风浪造成了海滩剖面潮上带的侵蚀和潮间带的淤积,滩肩脊两侧的坡度在台风的影响下变缓.在台风后恢复期连续常浪的向岸堆积作用下,潮上带泥沙量呈增加趋势,滩肩脊两侧的坡度又会逐渐变陡,同时滩肩脊的位置有所抬高且向陆域一侧移动.滩肩高程的恢复效率高于滩肩宽度的恢复效率,潮间带滩面的恢复效率高于平均高潮位以上滩面的恢复效率.波浪对于浪控沙滩恢复效率的主导作用主要体现在波高峰值和波浪非对称引起的泥沙输运通量,恢复期间涨潮期的底床切应力和回流速度大于落潮期,促进底砂起动后向岸净输运落淤.
Recovery efficiency and leading factor of sandy beach in Puqian Bay after Typhoon Kompasu
The narrowing of beach berm and steepening of backshore slope are important characteristics of storm sandy beach profile under the influence of storm wave action and the recovery during normal waves is closely related to the mutual feedback among the nearshore hydrodynamic force,sediments and geomorphology.Based on the sur-veyed data obtained from beach profiles in Puqian Bay before and after Typhoon Kompasu and surveyed data during the normal wave period,the recovery characteristics and the main impact factors of sandy beach recovery after ty-phoon storms were analyzed with XBeach model tests.Result showed that typhoon storm waves cause supratidal ero-sion and intertidal accretion in the profile.The slopes on both sides of the berm point decreased under the influence of typhoon storm,whereas the sediment in the supratidal zone was increased and the slopes on both sides of the berm ridge were gradually steeped and moved to land under the cumulative effect of post-typhoon storm waves.The recovery efficiency of berm elevation is higher than that of beach berm platform width and the overall recovery efficiency of the intertidal zone is the fastest,while recovery efficiency above the average high tide level is slower.The dominant role of waves in the restoration efficiency of wave-controlled profile shows mainly in the sediment transport flux caused by wave height and wave asymmetry.The bottom bed shear stress and return flow velocity during the flood tide period were greater than those in the ebb tide period,which promoted the net sediment transport to the shore.

marine geologystorm-profilenormal wave recoverymain controlling factorbeach bermXBeach

周嬴涛、何俊彪、朱钰、束芳芳、江沅书、冯曦

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自然资源部海洋生态保护与修复重点实验室、福建省海洋生态保护与修复重点实验室,福建 厦门 361005

河海大学港口海岸与近海工程学院,江苏 南京 210098

上海市城市建设设计研究总院(集团)有限公司,上海 200125

中国港湾工程有限责任公司,北京 100027

海南省海洋地质调查院,海南 海口 570206

自然资源部第三海洋研究所,福建 厦门 361005

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海洋地质学 风暴剖面 常浪恢复 主控因素 滩肩 XBeach

自然资源部海洋生态保护与修复重点实验室、福建省海洋生态保护与修复重点实验室开放基金海南省海洋地质资源与环境重点实验室开放基金海南省海洋地质资源与环境重点实验室开放基金中国港湾工程有限责任公司项目(中华人民共和国科技部)装备预研教育部联合基金

EPR202300922-HNHYDZZYHJKF02823-HNHYDZZYHJKF0372015-ZJKJ-018091B022123

2024

10.3969/J.ISSN.2095-4972.20230625001

应用海洋学学报
国家海洋局第三海洋研究所 中国海洋学会 福建省海洋学会

应用海洋学学报

CSTPCD北大核心
影响因子：0.526
ISSN：2095-4972
年,卷(期)：2024.43(3)