Beach nourishment evolution: analitycal and probabilistic analysis

In this paper a II level probabilistic analysis of the evolution of beach nourishments has been proposed. Such an analysis gives an approximate value of the failure probability with little calculation time. The limit state function is defined assuming that the nourishment must guarantee an adequate beach dimension. The analytical formulation proposed by Dean and its extension to curvilinear contours by Boccotti have been used to evaluate the limit state function. A comparison of the two formulations has been first performed. The results have shown that Dean's model is more severe than the Boccotti's one except for high deep-water wave steepness and small ratio between the depth of the bearing berm of the nourishment and the offshore wave length

A Probabilistic Prediction of beach nourishment evolution

A II level probabilistic analysis for predicting the lifetime of a beach nourishment project has been proposed. Considering that the new wider beach serves as shore protection by storms and to increase recreational benefits, it has been assumed that the beach reaches its failure state when its width becomes lower than a specified minimum. With reference to the one-dimensional equation of the beach planform evolution, the limit state function has been evaluated adopting an analytical formulation, which assumes curvilinear and parallel contours landward the beach nourishment project. In order to investigate the effects of the project’s geometry and of the fill material nature on the probability of failure, a sensitivity analysis has been performe

Reliability analysis of existing breakwaters

The relevant steps for reliability analysis are fwst described referring to a generic system and then applied to typical maritime structures. A picture of the existing codes that suggest target reliability level is supplied to compare reliability estimate with the target value. Reliability methods were applied to a typical rubble mound breakwater and to a typical vertical breakwater. The results have shown that reliability level of maritime structures is low if compared with the target values suggested by codes

A Probabilistic Prediction of Beach Nourishment Evolution.

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