QUANTITATIVE EVALUATION OF SEDIMENT FLOW, AND ASSOCIATED EROSION-DEPOSITION ON SEABED SUBJECTED TO DIAGONAL OVERLAP REFLECTION WAVES FROM LINEAR STRUCTURES

Abstract

 In the case where an incident plane wave meets a liner structure in perpendicular direction, the overlapped wave forms a classical stationary wave, which induces characteristic sediment flow on seabed. In more general situations, however, the incident wave meets linear structures in not perpendicular but diagonal directions. In these cases overlapped waves would behave in three-dimensional manner; the effectiveness of two-dimensional analyses and/or experiments would be limited. Present study aims to analyze the sediment flow induced by the diagonally incident and reflected waves, and evaluate quantitatively the erosion-deposition behavior, taking the response of seabed effective stress response to wave loading into account. We used an analysis method comprised with linear wave theory, pore-elasticity for seabed medium, and empirical sediment flow model mobilized by sea wave traction.