A Case Study on the Category Composition and Distribution of Zooplankton in the Sound Scattering Layer of Offshore Waters of North Taiwan

Abstract

本實驗透過繫留索之改良，以減少繫留索因波流作用而招致之網具破壞，故做本項設計研究。本研究以—40 cm×40 cm×32 cm之模型傳統箱網及新設計繫留索箱網，放置於波流水槽中，分別以四種重量之沉子結付於箱網以作實驗，在不同的流速及波高之運作下計測其繫留索張力，其結果如下：於相同的海況條件，當大浪強流時，新設計繫留索箱網之最大張力將減少至傳統箱網張力之55％以下，瞬間张力更降至傳統式繫留索之44％。由於彈性空間的設計，使新設計繫留索箱網在大浪強流時能減少其繫留索之最大張力及瞬間張力，這訊息可用以發展抗浪形之繫留索，以達保護箱網之目的，提高箱網之養殖效益。Experiments were conducted on preventing damage to net cages from waves andstrong current by reducing the swash through adjusting the tension in the mooring ropes.In this study,a 40 cm×40 cm×32 cm traditional net cage and a new design mooringrope net cage were used as models in a current-wave water tank.There were 4 kinds ofsinker weights fastened to the bottom of net cage.The tension of the mooring rope wasadjusted and measured under different flow velocity(V)and wave heights(H).Theresults are as follows:In the same condition,we can determine that the maximum tension of the new mooringrope can reduced to 55% of a traditional net cage and the instantaneous tension of thenew mooring rope was reduced to 44% of the traditional mooring rope when against strongwaves and current.Due to the design of the elastic space,the new mooring rope net cagecan reduces the maximum tension and instantaneous tension against strong waves andcurrent.This information was used in the development of an anti-wave mooring rope andprotects the net cage.