A Study on the Purse Seine Comparison of Sinking Speed and Tension of Purse Line in Two Nets , Made of Knotted Webbing and Raschel Webbing

건착망의 연구 - 사절망과 라셀망의 심항력과 장력의 비교 -

The authors carried out a model experiment to compare the sinking speed and the tension of the purse line in two nets, made of knotted webbing (Model A) and Raschel webbing (Model B). The model net was made in 1/450 scale of the actual net being commercially used in the Korean coastal waters for mackerel. The headline of the model net is 200cm and the maximum height 50cm. The weight of the sinker in water was changed 4g and its multiplication till 20g. The results obtained are as follows: 1. Sinking speed of the model A was faster 1. 4 to 1. 8 times than that of model B. 2. Tension of the purse line of the model A was 10 to 20 percent less than that of model B.

크기가 실물어구의 1/450이고, 망지는 각각 결절망지와 라셀망지를 쓴 건착망의 모형어구를 제작하여 발돌의 수중중량을 4g~20g까지 변화시킬 때의 침강속도와 죔줄의 장력을 비교한 바, 침강속도는 결절망지를 쓴 쪽이 1.4~1.8 빠르고, 죔줄의 장력은 라셀망지를 쓴 쪽이 10~20% 적었다. 따라서, 어군의 도피를 빨리 차단한다는 의미에서는 결절망지가 라셀망지보다 유리하다고 볼 수 있다.