底拖网配纲校核法

在分析比较目前中国各地曾使用过的各种底拖网配纲校核方法的基础上，提出了“网翼上、下边缘配纲之差与网盖缩结长度之比”（简称翼纲差比）的新配纲校核方法。翼纲差比较大的拖网，其网口易于升高而沉纲贴底程度较小些；反之，翼纲差比较小的拖网，其网口不易升高而沉纲贴底程度较大些。

The checking method for rigging parameters of bottom trawl in China

In this paper,the different kinds of checking method are compared andanalysed with regard to bottom trawl currently used in China.A new checking method is proposed here,in which the value X of checking parameter is equal to rigging length difference of upper and lower ropes of wing edges,divided by the hanging length of its square.The result shows when value X is greater,the trawl mouth will be liable to expand and its ground rope will be less closer to sea bottom. And if value X is smaller,the trawl mouth will not be easy to open but its ground rope will be kept closer to sea bottom.So far,five checking methods have been used for bottom trawl in China,three of them can only be applied to the comparatively different rigging parameters for the same type of nets with the same specification.The other two methods of rigging can be used for the same type of nets with different specification.The new method proposed here can be applied to various types of net with different specifications.