Backwash process of marine macroplastics from a beach by nearshore currents around a submerged breakwater
Backwash process of marine macroplastics from a beach by nearshore currents around a submerged breakwater
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水下防波堤周围近岸水流对海滩海洋大塑料的反冲洗过程
DOI：
10.1016/j.marpolbul.2015.10.060
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发表时间：
2015
影响因子：
5.8
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Kataoka;T.;Hinata;H.;Kato;S.
决定大型塑料在海滩上停留时间的一个关键因素是塑料在海上反冲洗的过程(反冲洗过程)。在此，我们根据两年的标记再捕获实验的分析，以及安装在海滩后面悬崖边缘的ZA摄像头拍摄的序列图像所揭示的近岸流结构，推断了和达哈马海滩塑料捕鱼浮标的反冲过程。分析结果显示，在海滩北部附近的水下防波堤周围发生的风暴事件中，发生了离岸洋流和近岸洋流在冲浪带汇聚的组合，48%的倒洗浮体最后一次被发现是在那里。我们得出的结论是，海滩上的大部分浮游物是沿海岸输送的，并倾向于集中在汇聚区，在那里它们被事件产生的近岸洋流反冲到近岸。
A key factor for determining the residence time of macroplastics on a beach is the process by which the plastics are backwashed offshore (backwash process). Here, we deduced the backwash process of plastic fishing floats on Wadahama Beach based on the analysis of two-year mark-recapture experiments as well as nearshore current structures revealed by sequential images taken by za webcam installed at the edge of a cliff behind the beach. The analysis results revealed the occurrence of a combination of offshore currents and convergence of alongshore currents in the surf zone in storm events around a submerged breakwater off the northern part of the beach, where 48% of the backwashed floats were last found. We conclude that the majority of the floats on the beach were transported alongshore and tended to concentrate in the convergence zone, from where they were backwashed offshore by the nearshore currents generated in the events.