ROLLER CONTRIBUTIONS AS INFERRED FROM INVERSE MODELLING TECHNIQUES

D.J.R. Walstra, G.P. Mocke, F. Smit

Abstract


Two independent approaches are discussed whereby inverse modelling is employed as a means of better quantifying roller contributions in the near shore. A so-called integral approach utilizes a coupling between the extended wave energy and momentum balance equations to make inferences regarding roller properties based on wave height and set up measurements. In a somewhat more indirect inverse modelling approach, as first discussed in Mocke et al. (1994), the roller properties are obtained from predicted vertical distributions of internal flow properties such as turbulent kinetic energy, suspended sediment concentrations and undertow velocities which are optimally fitted against measured profiles. An intercomparison between the two approaches is made to get an indication of the validity of the applied theories and inverse modelling techniques. The integral approach further serves to evaluate a new conceptual model for dissipation due to wave breaking.

Keywords


roller; modeling technique; inverse modeling

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