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  • 翁宇斌,杨顺良,赵东波.超百年一遇强降雨对厦门岛沙滩影响研究[J].海洋开发与管理,2022,39(1):82-87    
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超百年一遇强降雨对厦门岛沙滩影响研究
翁宇斌,杨顺良,赵东波
福建海洋研究所福建省海岛与海岸带管理技术研究重点实验室
摘要:
2018年5月7日厦门岛遭遇了超百年一遇的强降水,对岸滩造成了严重影响。文章采用现场测量、无人机航拍等方法,通过对冲毁岸滩进行现场调查与测量,发现厦门岛东南部10.78km的滨海沙滩岸段,共有10个岸段的沙滩发生明显冲刷,受损岸线总长度为6.1km(占比57%),形成了28条冲刷沟,沙滩遭受的侵蚀面积为20 286m2,冲刷量超过4万m3。分析其原因,主要是海岸带开发利用时,不透水面增多且具有一定的坡度,加之后方陆域地下排洪管涵排水,当短期强降水发生时,局部地形集中汇水后急速冲向海岸,导致海岸侵蚀垮塌和后退,沙滩冲刷成沟而流失大量海砂。针对不同沙滩的冲刷程度与影响机制,提出了相应的整治修复方案,可为今后沙滩维护保养提供参考。
关键词:  海洋地质学  滨海沙滩  特大暴雨  侵蚀流失  沙滩修复
DOI:10.20016/j.cnki.hykfygl.2022.01.006
基金项目:福建省科技厅科技计划项目“厦门岸滩稳定性及岸滩修复成效研究”(2016R1006-1).
Study on the Impact of Super Heavy Rainfall on the Beach of Xiamen Island
WENG Yubin,YANG Shunliang,ZHAO Dongbo
Fujian Institute of Oceanography,Fujian Provincial Key Laboratory of Coast and Island ManagementTechnology Study
Abstract:
On May 7, 2018, Xiamen Island was hit by extraordinary rainstorm (once in more than 100 years), which had a serious impact on the beaches in the southeast of the island. In this study, RTK GPS, leather ruler, ruler, drone and other equipment were used to investigate and estimate the degree of damage. A total of 10 shore sections including 22 beaches were washed out along the 10.78 kilometers beach in the southeast of Xiamen Island. The total length of the damaged shore line was 6.1 kilometers, accounting for 57% of the investigated beach. A total of 28 gullies were found and the damaged area was estimated to be 20,286 m2. This extraordinary rainstorm was estimated to result in more than 40,000 m3 sand being carried away. The damage could be due to the pavement of impermeable surface along the coastal zone which formed strong surface runoff on the sloping terrain when the extraordinary rainstorm occurred. The current was strong enough to erode the sand and stone steps and lawn, and even form gully. Based on the degree of damage and damage cause of individual beach, several remediation and restoration plans were suggested to recovery the beach. This study can provide some references for the future beach maintenance.
Key words:  Marine geology, Coastal beach, Super heavy rain, Erosion loss, Beach restoration