A frequency domain method for separating incident and reflected waves is proposed to account for normally incident waves propagating over a sloping beach in a wave flume. Linear wave shoaling is applied to determine changes of the wave amplitude and phase due to variations of the bathymetry. The wave reflection coefficient is estimated from wave heights measured by two fixed wave gauges with a separated distance. The method is applicable to both monochromatic and random waves. Brief comparisons between theories and the proposed model are made for waves propagating over a sloping seabed.
Wave reflection from natural beaches and man-made coasted sh-uctures influences the hydrodynamics and the sediment dynamics in front of the reflector. It is therefore important to understand the nature of this reflection and predict its magnitude accurately in engineering practice. The wave reflection of marine structures or their armored boundaries will be tested by two-dimensional or three-dimensional physical model before construction. In many laboratory studies it is desirable to separate the wave train into the incident and reflected waves so that the model response can be in terms of parameters of the incident wave field. In general, marine structures are constructed on sloping natural beds. The sloping bed that can reflect wave adds additional reflection to wave reflection from marine structures. Therefore the combined wave reflection results from both the sloping bed and the marine structure. Calculations of wave reflection from a sloping bed is a solution to distinguish the combined wave reflection due to the sloping bed and marine structures. The interaction between the incident and reflected waves on a sloping bed increases the additional complexity and difficulty in the measurement. Some previous works have been done for five decades.
