中文摘要：

外海波浪作用下海堤越浪是一个复杂的水动力学过程，越浪量则是评估海堤安全的重要因素之一。离岸式潜堤作为一种典型的护岸工程结构物，已被应用于淤泥质海岸复合式海堤工程，其主要作用是促淤保滩和降低越浪量。本文针对不同的潜堤与海堤距离以及不同的潜堤高程，进行了规则波作用下越浪量系列物理模型实验，给出了各工况下的实测越浪量。实验结果表明；潜堤是否导致波浪破碎是控制海堤越浪量的主要因素之一；当潜堤使得波浪破碎时，潜堤位置对海堤越浪量有较大影响。潜堤与海堤距离接近1／2波长时越浪量偏大。

英文摘要：

Wave overtopping against seawalls is a complicated hydrodynamic phenomena while the overtopping discharge is one of the most important factors for safety analysis of seawalls. Off-shore submerged dike is a common construction of bank revetment, which has been widely used for seawalls of composed sections on soft bottom in coasts to decrease the overtopping discharge and scouring. Physical model tests were carried out to investigate the effects of offshore submerged dike on overtopping of regular waves over the main seawall. The tests were respectively carried out for the cases of the different distance between the submerged dike and the seawall, and the different height of the submerged dike on the sea bottom. The experimental data were analyzed. It turns out that wave breaking around the submerged-dike is one important factor influencing the overtopping. When the waves pass the submerged-dike with breaking, the distance between the main seawall and the submerged-dike has a remarkable effect on overtopping over main seawall, and the maximum value of overtopping appears when the distance is about 1/2 of the wave length.