Several Properties In The Analysis Of Internal Wave Numerical Simulation

On the basis of mooring observation in Australian Northwest Shelf during Feb to Apr,1992,the major characteristics are analyzed of internal tides and internal solitary waves in this area. The background shear current could also be precisely identified by separated with ebb and spring period. By incorporating these two different background current into the Generalized-KdV model, the numerical simulation of internal solitary wave shape could be effective improved, especially compared with the simulation with 12-hour-average background current.On the basis of previous work, it is possible to quantitatively calculate the shear force exerted by internal wave on fixed cylinder pile.A large-amplitude soliton is produced by the G-KdV model in the Northeast of South China Sea. Assuming a fixed cylinder at station S7 with diameter of five meters,the velocity field and the load on it could be calculated. Since the velocity profile could have powerful shear with the passage of a large amplitude soliton, the pile has its largest shear force at the depth of velocity changing point, and this force peaks while the soliton amplitude gets its top.The shear force peaks at 2.27×105 N at the changing point, while the torque peaks at 109N·m at the bottom. In addition, the passage of soliton could change the velocity twice within one cycle (i.e. ten to twenty minutes), and this will amplify the destroying effect imposed on this pile.