| 东山岛东南侧近期岸滩演变及其动力成因 |
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| 引用本文： | 韩笑,孙杰,王青,潘明婕,吴彦,孔俊.东山岛东南侧近期岸滩演变及其动力成因[J].海洋湖沼通报,2019(4):55-65. |
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| 作者姓名： | 韩笑 孙杰 王青 潘明婕 吴彦 孔俊 |
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| 作者单位： | 河海大学江苏省海岸海洋资源开发与环境安全重点实验室;江苏中路工程技术研究院有限公司 |
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| 基金项目： | 水利部珠江河口动力学及伴生过程调控重点实验室开放研究基金[2018]KJ07;海岸灾害及防护教育部重点实验室开放基金(201706)资助 |
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| 摘 要： | 基于卫星遥感影像和水下地形数据,分析了近年来东山岛东南侧的岸滩演变特征。进一步,分别建立潮流、波浪、沿岸输沙数值模型,结合人类活动的影响,分析东山岛东南侧岸滩侵蚀的动力成因。研究结果表明,2002-2012年金銮湾的北侧海域海床侵蚀较为严重;1971-2003年,乌礁湾北侧湾顶呈现出侵蚀现象,2003-2012年,乌礁湾北侧湾顶由之前的侵蚀现象转变为一定的淤积趋势。主要原因如下:(1)岬角的挑流作用使得金銮湾和乌礁湾北侧岬角附近海域流速较大,容易产生冲刷侵蚀。(2)金銮湾和乌礁湾的北部波高较高,波能较大,容易遭受侵蚀。(3)金銮湾和乌礁湾北部海岸输沙强度较大,净输沙方向以自东向西为主,容易发生岸滩侵蚀。(4)20世纪90年代以来,东山岛人类活动强度增大,海滩不合理的人工建筑物、海岸防护林破坏以及养殖场的建造在一定程度上加重了侵蚀。(5)2003年后乌礁湾北侧修建了码头工程,导致近岸潮流和波浪动力有所减弱,使得侵蚀现象转变为一定的淤积。
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| 关 键 词： | 东山岛 岸滩演变 动力成因 水下地形 |
Recent Shorebeach Evolution and the Dynamic Cause in the Southeast Side of the Dongshan Island |
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| HAN Xiao,SUN Jie,WANG Qing,PAN Mingjie,WU Yan,KONG Jun.Recent Shorebeach Evolution and the Dynamic Cause in the Southeast Side of the Dongshan Island[J].Transaction of Oceanology and Limnology,2019(4):55-65. |
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| Authors: | HAN Xiao SUN Jie WANG Qing PAN Mingjie WU Yan KONG Jun |
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| Institution: | (Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security (Hohai University),Nanjing 210098,China;Jiangsu Sinoroad Engineering Technology Research Institute Company Limited,Nanjing 211806,China) |
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| Abstract: | Based on the satellite remote sensing images and underwater topographic data, the evolution characteristics of the shore beach in the south-eastern part of Dongshan Island in recent years have been analyzed. The numerical models of tidal currents, waves, and sediment transport along the coast were established and combined with the influence of human activities. The dynamic factors for the erosion of the beach on Dongshan Island were analyzed. The results of the study indicate that from 2002 to 2012, the seabed on the northern side of the Jinluan Bay has suffered serious erosion. From 1971 to 2003 , the top of the bay on the northern side of Wujiao Bay showed significant erosion evidences. From 2003 to 2012, the top of the bay on the north side of the Wujiao Bay has changed from a previous erosion phe nomenon to a certain sedimentation trend. The main reasons are as follows.(1) The turbulent effect of the cape makes the flow velocity near northern parts of Jinluan Bay and Wujiao Bay increase and prone to have washing erosion.(2) The wave heights in the northern part of the Jinluan Bay and Wujiao Bay are relatively higher and the wave energy is relatively larger, which is prone to erosion.(3) The intensity of sediment transport on the northern parts of the Jinluan Bay and Wujiao Bay is relatively larger. The direction of net sediment transport is mainly from east to west, and it is prone to have erosion.(4) Since 1990 s, the intensity of human activities on the Dongshan Island has increased, and unreasonable artificial buildings on the beach, destruction of coastal shelter forests, and construction of farms have exacerbated erosion to some extent.(5). |
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| Keywords: | Dongshan Island coastal evolution dynamic cause Underwater topography |
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