트롤 어구 소해면적의 수치해석적 추정
Estimation of the swept area of trawl net by numerical analysis
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초록
본 연구는 수산 자원 추정의 정밀도 향상을 위해 과거 조사에 사용되었던 트롤 어구의 설계 및 예망 정보들을 기반으로 소해면적 계산에 필요한 망폭 간격을 추정하는 것을 목적으로 한다. 이를 위해 트롤 어구를 유연구조물로 모델링하고 수치해석하였으며, 그 해석 결과를 회귀분석하였다. 그 결과, 예망 조건에 따른 망폭의 변동을 계산하는 모델을 도출하였고 이 모델에 과거 조사의 예망 조건들을 대입한 결과, 망폭의 크기는 끌줄 길이 증가에 따라 자연대수적으로 증가하였고, 같은 끌줄 길이에서 수심이 깊어질수록 선형적으로 감소하는 것을 확인했다. 모델의 타당성 검증을 위해 이론적인 식과 회귀모델식의 계산 결과를 비교한 결과, 약간의 값 차이는 있으나 끌줄길이 증가에 따른 망폭 증가 경향이 서로 일치 하였다. 따라서 제안된 모델을 통해 다양한 예망조건에 따른 망폭을 얻을 수 있고 자원량 추정의 정확성 향상에도 기여할수 있을 것으로 판단된다.
Abstract
This study aims to estimate the trawl net width based on the design drawing and towing condition of sampling trawl used in past surveys to improve the accuracy of estimation for fishery resources. To this end, the trawl gear was modeled as a flexible structure and numerically analyzed, and the analysis results were subjected to multiple regression analysis. As a result, a model was derived to calculate the net width by the towing conditions. When the towing conditions from past surveys were input into this model, it was confirmed that the net width increased in a natural logarithmic manner with the increase in the warp length and that decreased linearly as the water depth increased at the same warp length. For verification of the model, the theoretical formula of other study and this model were compared. As a result, despite the values of the two were slightly different, the tendency of changing net width by increasing warp length was consistent each other. Therefore, it is thought that the derived model can obtain the net width according to various towing conditions and can contribute to improving the accuracy of fishery resources estimation.
참고문헌 (14)
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