Field measurements of wave overtopping over a rubble mound breakwater have been carried out at Zeebrugge, Belgium, during the period 1999-2003. The overtopping volumes of water are collected in an overtopping tank located on the breakwater crest behind the access road. A short side of the tank is made of a weir allowing the collected water to flow out continuously, and allowing measurements to be made for long duration. Calculation of the inflow discharge is based on the outflow discharge over the weir and the volume in the tank. This calculation requires an accurate measurement of the water depth inside the tank. The water depth is measured indirectly using a pressure sensor near the bottom. The measurement set-up for wave overtopping at the breakwater is described in detail. Eight wave records with wave propagation normal to the breakwater have been used in the analysis of the field data. Wave heights range between 2.6 m and 3.9 m for wave records with a typical duration of 1 to 2 Troch et al., version submitted for Coastal Engineering 2 hours. The average overtopping rate has been calculated for all records using 3 methods.Average overtopping rates from the field data have been compared with predicted values from prediction formulae by van der Meer et al. [van der Meer,
As part of a major European research project into wave overtopping at coastal structures, overtopping discharges have been measured at full-scale on a vertical seawall in Southeast England. The measurement site, Samphire Hoe, is an area of reclaimed land just west of Dover on the English channel coast, and is an ideal location for monitoring overtopping. The site is described in detail, and the design and operation of the measurement equipment are also outlined. Overtopping was measured on three occasions and the storms and their results are discussed. It is shown that the field measurements compare well with empirical prediction methods by Besley (1999) and Bruce et al (2001). Additional discussion interprets the hazardous nature of each of the storms.
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