花花公子
护道
微塑料
潮间带
地质学
冲浪区
瘟疫
漂流者
海滩形态动力学
海洋学
地貌学
海岸
岩土工程
泥沙输移
沉积物
物理
拉格朗日
数学物理
作者
Jirat Laksanalamai,Nobuhisa Kobayashi
出处
期刊:Journal of waterway, port, coastal, and ocean engineering
[American Society of Civil Engineers]
日期:2023-07-25
卷期号:149 (6)
标识
DOI:10.1061/jwped5.wweng-1987
摘要
An experiment was conducted in a wave flume to measure the trajectories of 20 small objects (gravel and microplastics) in the surf and swash zones on an equilibrium beach and a nourished foreshore beach with erosion and accretion in the swash zone. The trajectory of each of the 20 objects was measured in six tests consisting of 100 runs, with each run lasting 400 s. Gravel particles were mobile within the swash zone only. Large and small microplastics moved onshore from the surf zone and accumulated in the lower swash zone of wave rundown or in the upper swash or berm zone of wave runup. Plastic particles remained on the evolving sand surface of the nourished foreshore. A simple tracking model was developed to predict the measured trajectories of the 20 particles of gravel and microplastics. The calibrated model also predicted limited net displacements of hypothetical sand particles on the equilibrium profile beach. The tracking model may eventually be generalized and become applicable to track and clean up microplastics on beaches and predict the destinations of sand particles placed on eroding beaches.
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