Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Experimental study on release of plastic particles from coastal sediments to fluid body

해안 유사에서 수체로의 플라스틱 입자 방출에 관한 실험적 연구

  • Hwang, Dongwook (Department of Civil & Environmental Engineering, Seoul National University) ;
  • Park, Yong Sung (Department of Civil & Environmental Engineering, Seoul National University)
  • 황동욱 (서울대학교 건설환경공학부) ;
  • 박용성 (서울대학교 건설환경공학부)
  • Received : 2022.08.19
  • Accepted : 2023.01.07
  • Published : 2023.02.28
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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.

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.

Keywords

Acknowledgement

본 연구는 서울대학교 신임교수 연구정착금으로 지원되는 연구비와 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원(No. NRF-2020R1F1A1070390)을 받아 수행하였습니다. 또한 서울대학교 공학연구원의 지원에도 감사드립니다.

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