Wave-induced pressures in porous bonded revetments. Part II: Pore pressure just beneath the revetment and in the embankment subsoil

•Focus on the response of the embankment subsoil beneath porous bonded revetments•Analysis and CFD-CSD modelling of the pore pressure distribution just beneath porous bonded revetments and in the sand core.•Comparison of the pore pressure distribution beneath porous bonded revetments and of that in porous seabeds.

This paper considers pore pressure distribution in the embankment subsoil beneath PBA-revetments, based on the results of the parameter study using the new validated CFD–CSD model system wavePoreGeoFoam described in the companion paper (Part I), which focusses on wave-induced pressures on PBA-revetments (Alcérreca-Huerta and Oumeraci, 2016-in this issue). In this paper (Part II), a general overview is first provided on the numerical parameter study, especially on the model setup for the extraction of data related to the wave-induced pore pressures in the sand core beneath PBA-revetments. Secondly, wave-induced pore pressure just beneath the revetment is analysed considering: peak pressure magnitude, its location beneath the revetment and their spatial distribution. Afterwards, a process analysis of the results of the parameter study is performed for the wave-induced pore pressure distribution in the sand core. Formulae are developed for the prediction of the pore pressure distribution just beneath the revetment and of the damping of peak pore-pressures in the sand core. Subsequently, a comparative analysis of the proposed formulae and the approach of De Groot et al. (2006) for the assessment of pore pressure in a porous seabed is made, showing a very good agreement between both results. Finally, implications and recommendations for engineering applications and for further research are drawn from the results.