不规则波作用下带基床直立堤平均越浪量试验研究

针对不规则波作用下带基床直立堤的平均越浪量问题,采用物理模型试验的方法,对堤顶超高、波高、周期以及基床等因素对越浪量的影响进行了研究。结果表明:堤顶超高和周期是直立堤平均越浪量的重要影响因素。当基床相对宽度B_t/H_s=1～4. 7时,基床宽度对平均越浪量的影响有限。同时,平均越浪量随着基床影响系数h~*的增大先增大后迅速减小,在h~*=15附近出现峰值,而在h~*=30之后基本不变。根据试验结果,提出了直立堤平均越浪量计算方法,为实际工程设计提供参考。

Experimental study on mean overtopping of vertical breakwaters with bed under irregular waves

Aiming at the problem of the mean overtopping of vertical breakwaters with the bed under irregular waves,the influence of the factors such as the height of the top of the breakwater,wave height,period and foundation bed on the overtopping is studied by means of physical model test.The results show that the height and period of the top of the vertical breakwater are important factors affecting the mean overtopping of the vertical breakwater.The width of the bed has a limited influence on the mean overtopping of vertical breakwaters when the relative width of bed is Bt/Hs=1~4.7.Meanwhile,the mean overtopping of vertical breakwaters with bed increases first and then decreases rapidly with the increase of the influence coefficient h*,and has a maximum value near h*=15,while it remains basically unchanged after h*=30.On the basis of the physical model experiment,the new calculation formulas on the mean overtopping of vertical breakwaters are set out,which may serve as a reference for the engineering design.