The characteristics of breaking wave forces are studied and the corresponding estimation procedures for them are proposed. For the characterization of the wave forces, three parts, i.e., drag force, inertia force, impact force are introduced and identified, respectively. Among drag force and inertia force and impact force, the impact force is mainly studied and a concise form of the force is proposed with the application calculation scheme. Example calculations of impact force are presented by the proposed scheme for a circular structural member. For a typical sea condition and member size, the proposed procedures for the breaking wave forces calculation are well demonstrated. It is found that this procedure for wave impact forces calculation for circular structure member is simple and easily applicable especially for the early design stage.
The importance of the impact wave force on the vertical offshore circular structure member in the surf zone due to the breaking wave has been recognized recently. In this paper the characteristics on breaking wave forces and the corresponding estimation procedures for them are investigated. For the characterization of the wave forces, three parts, drag force, inertia force, impact force are categorized and identified respectively. Among them the impact force is mainly studied and the concise form of the force is proposed with the application scheme for the design of offshore circular structure member. The resulting form proposed here for impact force is well coincided with former research results by other people. Except the impact force, the so called Morison equation can be employed as a first estimate for the common offshore structure design. The drag force and inertia force are represented as conventionally for the profile except the breaking part.
