《Table 1Norwegian aquaculture site classification for waves and currents》

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《波浪和海流对浮式海洋牧场的作用（英文）》

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Hssignificant wave height，Tppeak period of the wave spectrum，Uccurrent speed （adapted from NAS，2009）

There exists a variety of floating fish farms with net cages such as circular plastic collar and interconnected hinged steel fish farms.The floater of the circular plastic collar fish farm is made of high-density polyethylene（HDPE）pipes.It is common with two nearly semisubmerged interconnected concentric pipe circles（see Fig.1）.An example on dimensions in protected water is 50-m diameter and 15-m net-cage height.The solidity ratio Sn is an important parameter of netting and is for plane netting the ratio of the area of the shadow projected by wire（twine）meshes on a plane parallel to the screen to the total area contained within the frame of the screen.A typical twine diameter of the net is3 mm.The solidity ratio of the netting may be from 0.15 to 0.32，but biofouling can substantially increase the effective solidity ratio.A bottom weight ring（sinker tube）is often used instead of bottom weights to ensure sufficient volume of the net cage.An idea about wave and current conditions can be found in Table 1.