Acoustic analysis of volume variation in a bag-net within a set-net

摘要

An experiment designed to measure the volume variation of a bag-net within a set-net was conducted in Jaran Bay, Kosung, Korea. Three radio-acoustic-linked positioning (RAP) buoys, a time controller with a personal computer and seven pingers were used to measure the volumes of the bags. During the April neap tide, the minimum and maximum volumes of the bag-net were 4173 m super(3) (at 17.00 h) and 4757 m super(3) (12.00 h), respectively. The average current directions and speeds were 99.9 degree , 12.9 cm/s and 104.0 degree , 2.4 cm/s, respectively. During the spring tide, the minimum and maximum volumes of the bag-net were 2016 m super(3) (18.30 h) and 4454 m super(3) (15.00 h), respectively. The average current directions and speeds were 315.6 degree , 16.1 cm/s and 289.0 degree , 5.7 cm/s, respectively. The minimum (2016 m super(3)) and maximum (5568 m super(3)) volumes of the bag-net were observed during the period when the spring tide changed to the neap tide.