General longshore transport model

In the present paper a general longshore transport (LT) model is proposed after a re-calibration of the modeloriginally introduced by Lamberti and Tomasicchio (1997) based on a modified stability number, Ns**, forstone mobility at reshaping or berm breakwaters. Ns** resembles the traditional stability number (Ahrens,1987; van der Meer, 1988) taking into account the effects of a non-Rayleighian wave height distribution atshallow water (Klopman and Stive, 1989), wave steepness, wave obliquity, and nominal diameter of the units. Nine high-quality data sets from field and laboratory experiments have been considered to extendthe validity of the original model for a wider mobility range of the units: from stones to sands. The predictive capability of the proposed model has been verified against the most popular formulae in literature for the LTestimation of not cohesive units at a coastal body. The comparison showed that the model gives a betteragreement with the physical data with respect to the other investigated formulae.The proposed transport model presents a main advantage with respect to other formulae: it can represent anengineering tool suitable for a large range of conditions, from sandy beaches till reshaping breakwaters.