应用两种不同的波浪理论计算方形网箱水平波浪力  

Calculation on horizontal wave force using two wave theories for a square sea-cage

作　　者：宋伟华[1] 梁振林[1] 关长涛[2] 赵芬芳[1] 黄六一[1] 朱立新[1] 

机构地区：[1]中国海洋大学水产学院 [2]中国水产科学研究院黄海水产研究所

出　　处：《中国水产科学》2005年第1期91-98,共8页Journal of Fishery Sciences of China

基　　金：国家"863"高技术研究发展项目(2001AA623010;2001AA623030)

摘　　要：运用莫里森(Morison)和库兹涅佐夫(Kuznetsov)的计算方法对方形网箱及其构件受到的水平波浪力特性进行分析,分别依据正弦波和司托克斯二阶波理论,导出相应水平波浪力的迭加计算公式,并把计算结果与两种尺寸的网箱水槽试验进行对比验证。结果显示,正弦波理论计算值与试验值平均误差分别为11 19%和13 67%,二阶波计算平均误差分别为11 03%和13 87%,表明两者计算结论的差异性和计算方法的可行性。在波长、周期、波高和水深分别为150m、10 2s、10m、40m情况下模拟计算实物网箱水平波浪力,其二阶波受力峰值范围比正弦波的要窄、波谷值曲线要平坦,两者波浪力计算相差达8 70%,并且相差率与波高、波长成正比例关系,与水深成反比例关系,从而说明不同的波浪水域环境下应用不同波浪理论计算具有重要意义。Sea-cages are mechanically influenced by both waves and currents.An effective operation requires hydrodynamic research in the perspective of durability,security and productiveness of the cage.Current research is hindered by insufficient knowledge of wave force.It must be considered the intrinsic factors that the cage frame was rigid body but the nets and ropes were flexible system,of which the former dynamic behavior is used as reference of ocean engineering research and the later hydrodynamics is in view of fishing gear characteristic.Intrinsic factors of the cage,such as framework pattern (shape and size) and materials (rigid or flexible net and rope),must be considered in any simulation of the sort.Generally speaking,water depth in the zones of cages moored is very deep,and the waves in some zones tend to fragmentate.In the other hand,the bottom in some zones is made of mud and sand by sediment which is easy to float by waves.The waves containing mud and sand have much greater effect on cages than those clear.Furthermore the wave force caused by the former had nonlinear character.Therefore the calculation method of sine wave had some difference from reality,and other wave theory should be used to calculate the wave force for a square cage. By means of calculation methods of Morison's and Kuznetsov's,the characters of horizontal wave force for a square sea-cage and its components were analyzed,and two iterative calculation methods of horizontal wave force among frame,rope and net were put forward based on sine wave theory and Stokes second-order wave theory.Compared the two wave theories calculated values with the lab flume test results of the two kinds of cages respectively,cage A's dimension was 0.67m long,0.67m wide and 0.34m high;the frame and rope diameter was 32mm and 5mm;the net mesh was 16.8mm;the net cutting coefficient was 0.707 etc.Cage B's dimension as the above was 0.53m,0.53m and 0.27m,and 16mm,5mm,16.6mm,and 0.707,respectively.The results showed that the horizontal wave forces on the cage changed

关 键 词：方形网箱 水平波浪力 正弦波 司托克斯二阶波 水槽试验 

分 类 号：S969.19[农业科学—水产养殖]