Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Reliability Evaluation of the Estimation of Suspended Sediment Dispersion

부유사 확산예측 모형의 신뢰도 평가에 관한 연구

  • Tac, Dae-Ho (Marine Environmental Impact Assessment Center, National Institute of Fisheries Science) ;
  • Chung, Younjin (Marine Environmental Research Division, National Institute of Fisheries Science) ;
  • Jun, Eun-Ju (Marine Environmental Impact Assessment Center, National Institute of Fisheries Science) ;
  • Yang, Joon-Yong (Marine Environmental Impact Assessment Center, National Institute of Fisheries Science)
  • 탁대호 (국립수산과학원 해역이용영향평가센터) ;
  • 정연진 (국립수산과학원 어장환경과) ;
  • 전은주 (국립수산과학원 해역이용영향평가센터) ;
  • 양준용 (국립수산과학원 해역이용영향평가센터)
  • Received : 2022.09.02
  • Accepted : 2022.10.28
  • Published : 2022.10.31
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Abstract

Dispersion of suspended sediment, caused by coastal and marine development, is a key item in assessing marine environmental impact as it adversely affects marine life by increasing the level of turbidity and decreasing the amount of sunlight in seawater. However, its estimation has not been reliable because of the absence of a standard for the data measurement and divergent approaches to the impact assessment. In this study, we examined the estimation models from 58 Marine Environmental Impact Statements (MEISs, 2012-2014) to identify the gaps in the assessment and devise ways of improving the estimation. We developed four index items-grid system; unit load, particle size, and settling velocit-to evaluate their reliability in the estimation. The mean reliability score of each index was overall low-25 for grid system, 60 for unit load, 34 for particle size, and 17 for settling velocity. To ensure high reliability, it is important to develop a standard guideline that defines precise measurement of suspended sediment for unit load and settling velocity by particle size, followed by a grid system with compatible size for modelling. This can improve the estimation and thus underlie coherent impact assessment of suspended sediment dispersion on marine environment.

해상공사에서 발생하는 부유사는 해수의 탁도를 증가시키고 광량을 감소시켜 해양생물에 악영향을 미치므로 해양환경영향평가에서 중요한 요소이다. 하지만 평가에 적용되는 인자에 대한 공식적인 자료의 부족과 평가자의 능력에 따라 그 영향이 달리 평가되고 있다. 따라서 본 연구에서는 해역이용영향평가센터에서 검토한 3년간(2012-2014)의 매립, 준설, 외곽시설물 설치 등 총 58건 사업에 대한 부유사 확산 평가에 대한 실태를 진단하고 개선방안을 제시하였다. 개선방안 제시를 위해 4가지의 평가지표(격자체계의 적정성, 원단위의 적정성, 대표입경 및 침강속도의 적정성)를 적용하였다. 각 항목별 신뢰도에 평균점수 분석결과, 격자체계는 25점, 원단위는 60점, 대표입경은 34점 그리고 침강속도는 17점으로 평가항목에 대한 개선방안이 필요한 것으로 나타났다. 본 연구에서는 부유사 확산 평가상태에 대한 진단 및 신뢰도 평가 결과를 활용하여 부유사 확산예측에 대한 개선방안을 제안하였다. 먼저, 부유사 발생원단위 및 대표입경별 침강속도에 대한 공신력 있는 값이 가이드라인을 통해 제공해야 한다. 그리고 실무에선 신뢰성 향상을 위해 격자체계의 적정성과 결과의 검증을 철저히 해야 한다.

Keywords

Acknowledgement

본 논문은 2022년 해양수산부 국립수산과학원 수산시험연구사업(R2022060)의 지원으로 수행된 연구이며, 연구비 지원에 감사드립니다.

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