Applicability of suspended sediment concentration formulae to large-scale beach morphological changes

Book chapter


Jayaratne, R., Takayama, Yasufumi and Shibayama, Tomoya 2012. Applicability of suspended sediment concentration formulae to large-scale beach morphological changes. in: Lynett, Patrick and McKee Smith, Jane (ed.) Proceedings of 33rd Conference on Coastal Engineering, Santander, Spain, 2012 Reston, VA Coastal Engineering Research Council.
AuthorsJayaratne, R., Takayama, Yasufumi and Shibayama, Tomoya
EditorsLynett, Patrick and McKee Smith, Jane
Abstract

Study of beach morphological changes under storm conditions and its prediction capability are of paramount importance in coastal zone management. Seabed sediment is picked up violently in and outside the surf zone due to suspension mechanisms, therefore a considerable amount of sand is transported in coastal waters due to such mechanisms. For the construction of an accurate beach morphological model, it is necessary to elucidate the sediment suspension and to introduce it properly into the modelling of sediment transport. Jayaratne and Shibayama (2007) developed a complete set of explicit theoretical formulae to predict the time-averaged concentration on sandy beaches due to three suspension mechanisms: a) vortical motion over wave-generated sand ripples, b) from sheet flow, and c) turbulent motion under breaking waves. The present paper focuses on the development of a quasi-3D beach deformation model using the sediment concentration models of Jayaratne and Shibayama (2007), the bed load model of Watanabe (1982), the wave propagation model of Onaka et al. (1988), the nearshore current model of Philips (1977) and the undertow model of Okayasu et al. (1990) to predict the large-scale morphodynamics of sandy beaches. The predicted beach profiles and total sediment transport rates were compared with two sets of large-scale laboratory experimental data [Kajima et al. (1983); Kraus and Larson (1988)] and Seisho beach at Kanagawa Prefecture, Japan. It can be concluded that the present numerical model is capable of predicting sediment transport direction, on-offshore sand bar formation and the general trend of the beach profiles of large-scale erosive- and accretive-type sandy beaches to a satisfactory level.

Keywordssedimentation suspension; large-scale beach morphological changes; wave-generated sand ripples
Book titleProceedings of 33rd Conference on Coastal Engineering, Santander, Spain, 2012
Year2012
PublisherCoastal Engineering Research Council
Publication dates
PrintDec 2012
Publication process dates
Deposited24 Oct 2013
Place of publicationReston, VA
EventCoastal Engineering 2012
ISBN978-0-9896611-1-9
Accepted author manuscript
License
CC BY
Publisher's version
License
CC BY
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