Numerical simulation of wave pressure at submarine slope surface under progressive waves

ZHU Feiyang; LIU Xiaoli

doi:10.13984/j.cnki.cn37-1141.2024.05.003

Abstract：Wave-induced slope instability can threaten the safety of offshore engineering.The wave pressure distribution at the slope surface directly influences the slope stability.The hydrodynamic nu-merical model based on the finite volume method was used to simulate the propagating process of pro-gressive wave over submarine sloping bed.After validation of the numerical model,the influence of water depth,wave height and wave period on the characteristics of wave pressure distribution at slope surface was further investigated.The results showed that the smaller water depth,the larger wave height,and the longer wave period would lead to larger wave pressure on the slope prior to wave break-ing.For the case of wave breaking,the smaller water depth,the shorter wave period,and the larger wave height and inclination of the slope could cause the wave breaking zone moving toward the off-shore.For gentle slopes with an inclination angle of 3°～9°,the maximum wave pressure might in-crease by 20％～80％of that at the bottom of the slope.The wave pressure before wave breaking in-creases nonlinearly over the sloping bed,and the increased ratio of the maximum wave pressure to that at the bottom of the slope might be enlarged by 1.2～1.3 times due to wave breaking.The wave pres-sure decreased significantly after wave breaking,and its value might be smaller than that at the bottom of the slope.