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.