수조 실험에 의한 삼중자망의 뜸줄 높이에 대한 수치해석
Numerical analysis on the headline heights of a trammel net in a flume tank experiment
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조류나 해류가 있는 곳에 놓여 있는 자망의 높이는 어획 효율에 큰 영향을 미친다. 본 논문에서는 삼중 저자망의 형상에 대한 미분방정식을 수치계산에 의해 구한 방법과 수조에서 측정한 것을 비교하였다. 수조 실험에 의하면 slack은 어구의 깊이에 따라 다른 것이 관찰되었으므로, slack을 어구의 깊이에 따라 자연수 값으로 증가하는 값을 적용하여 미분방정식의 해를 구해 삼중망의 높이를 구하였다. 그 결과, slack을 일정한 값으로 사용한 경우나 slack을 일정한 값으로 하면서 저면 효과를 고려하여 유속을 감소시켜 적용한 경우보다 오차가 더 작은 것을 확인할 수 있었다.
Abstract
An estimation of the headline height of a bottom trammel net set across under uniform current was achieved numerically from a differential equations describing the forces of the net and compared with the measured value in a flume tank experiment. The analysis on the shape of the bottom trammel net with the headline free was based on the equilibrium equation of the bottom gill net which was modified and slack of the trammel net was varied with net depth as shown in the tank experiment. The differential equations were solved by a forth-order Runge-Kutta method. The estimated headline heights with varied slack was found to be closer than that with constant slack when compared with the actual values.
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