| 摘要: |
| 为保护亚龙湾砂质海岸及其生态系统，文章采用2016年和2019年的监测数据以及2008年的历史数据，依据相关技术标准和方法，从岸线后退速率和岸滩下蚀速率2个方面综合评价亚龙湾砂质海岸的侵蚀状况和侵蚀强度，并分析其原因。研究结果表明：亚龙湾砂质海岸存在持续性较强且较严重的海岸侵蚀；2008-2016年岸线后退速率和年均土地损失面积分别约为-1.00 m/a和2 080 m2，2016-2019年岸线后退速率和年均土地损失面积分别约为-1.80 m/a和9 836 m2，亚龙湾海岸侵蚀有明显加剧的趋势；2016-2019年亚龙湾东部和西部海岸的岸滩下蚀速率分别约为-13.3 cm/a和-36.2 cm/a，西部岸滩下蚀速率远高于东部岸滩；亚龙湾全段为强侵蚀等级，其中东部岸段为强侵蚀等级，西部岸段为严重侵蚀等级；造成亚龙湾海岸侵蚀的原因主要包括海岸工程建设、植被破坏和海平面上升。 |
| 关键词: 砂质海岸 海岸侵蚀 侵蚀强度 岸线后退 岸滩下蚀 |
| DOI： |
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| 基金项目:海南省自然科学基金项目（420RC746）. |
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| Monitoring and Evaluation of Coastal Erosion of Sandy Beach in Yalong Bay |
| SHI Haiying,CHEN Zhou,LYU Yubo |
| Ocean Monitoring and Forecasting Center of Hainan Province |
| Abstract: |
| According to related technical standards and methods, in order to protect sandy beach of Yalong Bay and its ecosystem, monitoring data in 2016 and 2019 as well as historical data in 2008 were adopted to comprehensively evaluate sandy coastal erosion and erosion intensity by coastline retreat rate and coast erosion rate, and its causes were analyzed. The results showed that the sandy beach of Yalong Bay had suffered a long-term serious coastal erosion. During 2008 to 2016, coastline retreat rate was －1.00 m/a and average annual loss of land area was 2 080 m2. During 2016 to 2019, coastline retreat rate and average annual loss of land area were －1.80 m/a and 9 836 m2 respectively. Research data showed that there was an increasing tendency of coastal erosion in Yalong Bay. Besides, the rate of intertidal topology down-cutting of eastern coast was －13.3 cm/a, and that of western coast was －36.2 cm/a. The results showed that the west coast of Yalong Bay suffered more severer erosion. With respect to the coastal erosion intensity, the whole section of Yalong Bay experienced serious erosion, more specifically, the east coast experiences serious, while the west coast mild. Coastal engineering construction, vegetation deterioration and sea level rise were the main causes for coastal erosion in Yalong Bay. |
| Key words: Sandy beach,Coastal erosion,Erosion intensity,Coastline recession,Intertidal topology down-cutting |
