Experimental study on release of plastic particles from coastal sediments to fluid body

Dongwook Hwang; Yong Sung Park

doi:10.3741/JKWRA.2023.56.2.125

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2023 Vol.56, Issue 2 Preview Page Next Page

Research Article

Experimental study on release of plastic particles from coastal sediments to fluid body 해안 유사에서 수체로의 플라스틱 입자 방출에 관한 실험적 연구

28 February 2023. pp. 125-137

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Abstract

In marine environments, plastics have become more abundant due to increasing plastic use. Especially, in coastal regions, particles may remain for a long time, and they interact with flows, wind, sand and human activities. This study aimed thus to observe how plastic debris interacts with and escape from sediments. A series of experiments were conducted in order to gain a better understanding of particle release from coastal sediments into water body. An oscillating water tunnel was built for the experiments, and used to generate oscillatory flows of relatively high Reynolds number and induce sediment transport. Spherical plastic particles of three different sizes was used in lieu of plastic debris in environments. It was observed that release of the particles was directly related to change of bedform, which is in turn determined by the flow condition. Also smaller particles tend to escape the sediment more readily. Critical values for dimensionless parameters are proposed.

Keywords

Plastic pollution

Plastic release

Sediment transport

Oscillating water tunnel

지속적으로 증가하는 플라스틱의 사용으로 인하여 현재 해안·해양 환경에서 플라스틱을 찾기란 어렵지 않은 일이 되었다. 하천을 통해 해양으로 유출된 플라스틱 폐기물은 해안 지역에서 장기간 머물며, 파랑, 바람, 유사, 인간 활동 등과 같은 다양한 요인들과 상호작용하며 물리적·화학적 변화를 겪게 된다. 이에, 실험적 연구를 통하여 해안 유사에서 수체로의 플라스틱 입자 방출 과정을 고찰하고자 하였다. 본 연구는 고 레이놀즈 수를 가지는 왕복 흐름과 유사 이동을 구현하기 위한 왕복흐름발생장치를 제작하여 진행되었고, 세 가지의 크기를 가지는 매끈한 구형의 플라스틱 입자를 사용하였다. 실험 결과, 유사 내 플라스틱 입자의 방출은 유사 이동에 가장 큰 영향을 받았으며, 이는 흐름의 세기에 비례한다. 더불어, 입자가 작을수록 더 많은 입자가 방출되었다. 결과를 종합하여 입자의 방출을 결정하는 무차원 매개변수들의 임계값을 제시하였다.

키워드

플라스틱 오염

플라스틱 방출

유사 이동

왕복흐름발생장치

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 56
No :2
Pages :125-137
Received Date : 2022-08-19
Revised Date : 2023-01-01
Accepted Date : 2023-01-07
DOI :https://doi.org/10.3741/JKWRA.2023.56.2.125

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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