The effect of the slope angle on the failure of the grass revetment due to wave impact

Parts of the Netherlands are protected against floods from the sea by a variety of dikes. At the Dollard in the Netherlands, a green dike was constructed. A green dike is a dike with a grass cover on the entire slope and such a dike does not contain a hard revetment to deal with the incoming waves (Figure ). The assessment of the strength of the grass revetment against wave impact is captured in the “Wettelijk Beoordelingsinstrumentarium” (WBI). However, it is uncertain under which storm circumstances the seaside grass revetment fails, because the slope angle is not included in the safety assessment (WBI). The objective of this research is to determine the effect of the slope angle on the duration until failure of the revetment due to wave impact, also termed resistanceduration.