Expermental Study On The Overtopping Discharge And Overtopping Flow Of The Sloped

A dike is an important sea defense to prevent the costal area from hitting by tides and waves. Wave overtopping was indeed responsible for many severe dike failures in the past. Great impact on the crest and the inner slope given by abundant waves overtopping sometime results the breaching of seadikes, which usually causes great economic suffering. Usually, overtopping can not be avoided due to the economic reason and foundational restriction and the uncertainties associated with the prediction of the design water levels and the design waves, especially under storm action. Therefore it is necessary to consider the allowable overtopping rate and the inner slope protected matter in seadike design.A review of the literature on the overtopping of seadikes reveals that the structure patterns of seadikes influence the overtopping rate greatly. Due to the economical and environmental conditions in our country, the sloped dike is usually with a crown in different height. So it is necessary to consider the effect of the relative height of the crown for study on the overtopping rate of seadikes in our country. In this paper, overtopping experimental data of structure patterns of our country is collected; then a simply sloped cross of the dike is selected to carry out a series of physical experimentations to study diversified parameters effecting the overtopping discharge; finally formula for calculating the mean overtopping is established, and at the same time advice about how to use the formula in the practical projects is given according to the collected data. At last overtopping distributing and maximal overtopping rate are analyzed:Although wave overtoppting is explicitly considered in the design of seadikes, only mean overtopping rates are included as a design parameter now. However, mean overtopping rates are neither appropriate for the description of the infiltration and erosion processes nor for the initiation of dike fanilures. The previously published results show that sometimes mean overtopping rates are not always appropriate to describe the associated dike failures. Flow velocities and pressure of the water over the dike are required to assess the infiltration and erosion on the landward side of the...