摘要
受人为工程的影响,相对稳定的岬湾海岸地貌常经历显著的动态调整。本文以粤东靖海湾典型岬湾海岸为例,运用Mc Laren模型、波浪动力场数值模拟、等深线对比、冲淤计算等多种方法,从海岸地貌动力学角度,对人为岬角工程前后岬湾海岸地貌动力过程和冲淤演变进行综合分析。结果表明:1)海岸地貌动力系统内常存在负反馈机制以维持系统的稳定。岬角工程后上岬角防波堤沿SSW延伸,ESE和E向浪经过防波堤时发生绕射,波能削减,湾顶动力减弱,海滩沉积物从下岬角向湾顶反向运移;2)海滩的蚀积状态在工程前后发生了转换,工程前遮蔽段侵蚀、开敞段堆积;工程后遮蔽段堆积、开敞段侵蚀;3)海湾水下地形对岬角工程的响应敏感,工程后海湾水下地形冲淤剧烈。
Significant dynamic adjustments occur constantly on headland-bay coasts after artificial engineering. In this study,Mc Laren model,morphodynamic simulations（ CMS-Wave）,bathymetric comparison and erosion-accretion calculation were used to study beach morphodynamic behavior and morphological evolution of Jinghai Bay（ Southern China）,a typical headland-bay coast influenced by an artificial headland. Results indicate that： 1） Morphodynamic system has negative feedback mechanism to maintain a stable bay. The upper headland extends in the direction of SSW after the breakwater construction,leading to wave diffraction and reflection,with lower wave energy in the shadow zone than in the open sector. The headland-bay beach follows a general sediment transport trend from the open sector on the down coast to the shadow sector on the upper coast in accordance with wave conditions and energy regimes. 2） The headland bay beach presents a slight erosion state before the engineering,with erosion in the shadow sector and accretion in the open sector. After the engineering,the beach comes to a deposition state,with accretion in the open sector and erosion in the shadow sector.3） The nearshore emerged a sensitive response to the headland engineering,and there is increased erosion-accretion after the engineering.
作者
姬泓宇
陈沈良
雷亚平
郭晓娟
朱正涛
JI Hongyu CHEN Shenliang LEI Yaping GUO Xiaojuan ZHU Zhengtao(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China Institute of Estuarine and Coastal Research, Sun Yat-Sen University, Guangzhou 510007, China)
出处
《海洋工程》
CSCD
北大核心
2016年第5期57-64,共8页
The Ocean Engineering
基金
海洋公益性行业科研专项经费项目资助(201405037)
关键词
岬湾海岸
海滩状态
海湾冲淤
海岸工程
靖海湾
headland-bay coast
beach state
erosion / accretion
artificial engineering
Jinghai Bay
