海洋地质前沿2025，Vol.41Issue(8)：1-12,12.DOI:10.16028/j.1009-2722.2024.172
浙江朱家尖岛东南沙滩群地形年际变化特征及影响因素
Inter-annual morphological evolution characteristics and impact factors of the southeastern sandy beaches of Zhujiajian Island,Zhejiang Province
摘要
Abstract
To investigate the morphological evolution characteristics and impact factors of the southeastern sandy beaches in Zhujiajian,Zhejiang,six topographic surveys of bed profiles were conducted from November 2012 to November 2015.Results show that the beach morphology exhibited significant seasonal variations before beach nourishments.Specifically,the period from post-typhoon to the end of winter was featured by extensive accretion in upper and middle beach,with a maximum accretion height of 0.97 m.Meanwhile,the top and bottom of the beaches showed slight erosion,with erosion depths generally less than 0.3 m.Beach berms was formed as shown in the northern Dongsha and southern Nansha profiles.From spring to pre-typhoon season,the middle beach was eroded while the upper and lower beach were silted up,with the maximum erosion depth and accretion height of approximately 0.8 and 0.5 m,respectively.During the typhoon season,intense erosion occurred in the upper and middle parts of the beaches,with maximum erosion depth exceeding 1.0 m,while the lower parts experienced ac-cretion,with maximum accretion height around 0.45 m,forming typical storm profiles.From November 2012 to November 2015,significant inter-annual morphological changes were observed in the southern Dongsha and northern Nansha with local erosion depths exceeding 1.0 m,which indicates erosion risks.In contrast,Qiansha,Lisha,and Qingsha exhibited dynamic equilibrium state with morphological changes ranged between-0.6 m and 0.4 m.Additionally,the morphological evolution of the beaches was jointly controlled by tides and waves,during which geomorphological conditions and human activities further influenced the morphological features.Dongsha,being less sheltered by headlands,experienced stronger hydrodynamic forces and more intense morphological changes.Human activities may contribute to the erosion in Dongsha and Nansha,highlighting the importance of scientifically design of artificial structures to maintain the natural dynamic balance of the beaches.关键词
朱家尖岛/沙滩/地形变化/水动力/人类活动Key words
Zhujiajian Island/sandy beach/morphological evolution/hydrodynamic/human activity分类
海洋科学引用本文复制引用
汪拾金,张一鸣,王致辉,胡鹏,董超,李薇..浙江朱家尖岛东南沙滩群地形年际变化特征及影响因素[J].海洋地质前沿,2025,41(8):1-12,12.基金项目
东海实验室开放基金(DH-2022KF0221) （DH-2022KF0221）
中央自然灾害防治体系建设项目(2023330053) （2023330053）
浙江省地质专项资金项目(2023013) （2023013）
国家自然科学基金(12272349,52339005) （12272349,52339005）
