粤东靖海湾海岸地貌动力演变及其工程影响

发布时间：2018-01-17 19:15

本文关键词：粤东靖海湾海岸地貌动力演变及其工程影响　出处：《海洋工程》2016年05期 　论文类型：期刊论文

【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。
[Abstract]:Influenced by human engineering, the relative stability of the headland Bay coast landforms often experience significant dynamic adjustment. This paper takes the typical Jinghai Bay headland Bay coast as an example, using the Mc Laren model, dynamic wave field numerical simulation, contour contrast, siltation calculation methods, from the coast to the appearance of man-made headland before and after the view of dynamics. Project of headland Bay coast geomorphology process and the evolution of erosion and deposition were analyzed. The results show that: 1) often have a negative feedback mechanism to maintain the stability of the system in the power system. The Cape Coast project on Cape breakwater along the SSW extension, ESE and E to the wave after breakwater occurs when the diffraction wave energy, power cuts, the top of the Bay weakening of beach sediment migration from top to reverse under the headland Bay; 2) beach erosion state changed in the project before and after the project before the shield section erosion, open period of accumulation; after the project shield section accumulation, open segment invasion Corrosion; 3) underwater terrain on the headland Bay in response to engineering project after the Gulf sensitive, underwater terrain erosion intensity.

【作者单位】：华东师范大学河口海岸学国家重点实验室;中山大学河口海岸研究所;
【基金】：海洋公益性行业科研专项经费项目资助(201405037)
【分类号】：P737.1;P75
【正文快照】： 受岬角控制的岬湾海岸是全球最普遍的一种海岸类型[1]。岬湾海岸在不同的时间尺度上呈现不同的形态变化特点[2],长时间尺度的海岸平衡形态受岬角形状、近岸环流、波向角的控制[3]。在岬角人为工程的影响下,由于岬角形态的改变,岬湾海岸的动力与地貌过程随之发生相应的调整。岬

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