Research On Causes And Numerical Models Of Meandering Damage For Breakwater

In the past decades, many references have studied the mechanics of meandering damage for breakwater. However, up to the present time, no model has been proposed to compute the consequence of this kind of damage quantitatively. So, this paper tries to solve this problem by combining the expected sliding distance technique and the diffraction model.In the first part of this paper, the diffraction model is used to simulate the wave height distribution before the breakwater. Beside, using the fourth-order Adams-Bashorth-Moulten scheme to solve Boussinesq equations, and the source function wave-making method is also used. During solving the wave height distribution before breakwater under the impact of regular/irregular wave, source program written by fortran and MIKE21 BW module are used. It shows that wave height shows a regular and weakening fluctuation. At the position away from the breakwater tip, the wave height tends to double of incoming wave height. The maximum wave height turns up near the breakwater tip, which is the main reason of the head area of breakwater failing easily.In the last part of this paper, the sliding distance model is employed to calculate the sliding distance of breakwater during a storm.It is seen that the sliding distance undulate periodically along the trunk of breakwater, which form the meandering damage. The variation of the discussed quantities is large within the range less than 400m and then tends to the values of non-meandering variation outside, which indicates the operation of wave diffraction concentrates on the region of the tip of breakwater ,and satisfied result can be attained.