| 海岸沙席对台风的形态响应特征 |
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| 引用本文： | 杨林,董玉祥,黄德全.海岸沙席对台风的形态响应特征[J].热带地理,2021,41(5):968-974. |
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| 作者姓名： | 杨林 董玉祥 黄德全 |
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| 作者单位： | 1.韶关学院 旅游与地理学院，广东 韶关 512005;2.中山大学 地理科学与规划学院，广州 510275;3.广州新华学院 资源与城乡规划系，广州 510520 |
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| 基金项目： | 国家自然科学基金项目(41371030);韶关学院校级科研项目(SY2018KJ01);韶关学院博士科研启动经费项目(2018) |
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| 摘 要： | 采用RTK GPS测量技术与方法，在2014—2017年对福建平潭岛典型海岸沙席进行了连续16次形态高精度测量，分析了海岸沙席在台风作用下的形态变化及台风季后的形态恢复变化特征。结果表明：1）海岸沙席对台风的形态响应特征明显，基本表现为海滩及沙席前缘高度降低（最大侵蚀深度为0.92 m），沙席中部高度变化相对较小（≤0.15 m），沙席后缘高度稍有升高（最大堆积厚度为0.75 m）。2）在台风季后，海岸沙席形态恢复变化也较为一致，主要表现为体积减少，海滩及沙席前缘高度稍有升高（最大堆积厚度为0.78 m），沙席中部高度降低幅度极小（≤0.10 m），沙席后缘高度略有降低（最大侵蚀深度为0.47 m）。3）海岸线走向是影响区域海岸沙丘对台风响应的重要因素，对于沙源不足、以离岸风为主的山岐宫海岸沙席，台风在其海岸沙席形态演变中的塑造作用突出。
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| 关 键 词： | 海岸沙席 台风 形态变化 海岸线走向 平潭岛 |
| 收稿时间： | 2020-10-12 |
Morphological Response of Coastal Sand Sheets to Typhoons |
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| Lin Yang,Yuxiang Dong,Dequan Huang.Morphological Response of Coastal Sand Sheets to Typhoons[J].Tropical Geography,2021,41(5):968-974. |
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| Authors: | Lin Yang Yuxiang Dong Dequan Huang |
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| Institution: | 1.College of Tourism and Geography, Shaoguan University, Shaoguan 512005, China;2.School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;3.Department of Resources and Urban Planning, Guangzhou Xinhua University, Guangzhou 510520, China |
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| Abstract: | Typhoons, as essential influential factors for the formation and evolution of coastal dunes, are one of the most important aspects of surf zone-beach-dune interaction research. Pingtan Island is located on the eastern coast of Fujian Province, China, and preserves a typical type of coastal dunes on China's coastline. These dunes are well-known for their typical shape, volume, and limited human disturbance. Pingtan Island suffers frequent, unavoidable damage from typhoons, and was therefore selected as the study site for this research. Field investigations were conducted on the island before and after typhoon events, by using high-precision RTK GPS technology and surveying methods. The field site was visited 16 times between 2014 and 2017. We analyzed the morphological responses of coastal sand sheets to typhoons, and the related morphological changes. Finally, we summarized the morphological response patterns of coastal sand sheets to typhoons. This study is of great importance for comprehensively understanding the morphological evolution of coastal dunes, which is fundamental for effective coastal planning and management. The following results were obtained: (1) The typhoon imposed significant morphological changes on coastal sand sheets, which can be summarized as a decrease in the height of the beach and frontal coastal sand sheets (maximum erosional depth of 0.92 m), minor variations in the height of coastal sand sheets at middle sites (≤ 0.15 m), and a slight increase in the height of coastal sand sheets at the trailing edge (maximum accumulation thickness of 0.75 m). (2) After the typhoon season, the morphological changes in coastal sand sheets are more consistent, and they mainly manifest as a decrease in volume and a slight increase in the height of the beach and frontal coastal sand sheets (maximum accumulation thickness of 0.78 m). There was a very slight decrease in the height of the middle coastal sand sheets (≤ 0.10 m), and a slight decrease in height at trailing edge of the coastal sand sheets (maximum erosion depth of 0.47 m). (3) Coastline direction is an important factor that affects the response of regional coastal dunes to typhoons. At sites that lack sand resources and experience dominantly offshore wind, typhoons play a prominent role in frontal coastal sand sheet erosion, and can result in a receding coastline (up to 4.0-5.0 m). |
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| Keywords: | coastal sand sheet typhoon morphological change trend of the coastline Pingtan Island |
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