APPLICABILITY OF SUSPENDED SEDIMENT CONCENTRATION FORMULAE TO LARGE-SCALE BEACH MORPHOLOGICAL CHANGES

Ravindra Jayaratne; Yasufumi Takayama; Tomoya Shibayama

doi:10.9753/icce.v33.sediment.57

No. 33 (2012), Sediment Transport and Morphology

No. 33 (2012)

APPLICABILITY OF SUSPENDED SEDIMENT CONCENTRATION FORMULAE TO LARGE-SCALE BEACH MORPHOLOGICAL CHANGES

Sediment Transport and Morphology

https://doi.org/10.9753/icce.v33.sediment.57

Published 2012-12-15

Ravindra Jayaratne⁺⁻
Yasufumi Takayama⁺⁻
Tomoya Shibayama⁺⁻

Ravindra Jayaratne

University of East London

Yasufumi Takayama

Civil Engineering Technology Institute

Tomoya Shibayama

Waseda University

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Keywords

large-scale beach morphological changes
sediment suspension
wave-generated sand ripples
sheet flow
breaking waves
sediment concentration
Quasi-3D beach deformation model

How to Cite

Jayaratne, R., Takayama, Y., & Shibayama, T. (2012). APPLICABILITY OF SUSPENDED SEDIMENT CONCENTRATION FORMULAE TO LARGE-SCALE BEACH MORPHOLOGICAL CHANGES. Coastal Engineering Proceedings, 1(33), sediment.57. https://doi.org/10.9753/icce.v33.sediment.57

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.

https://doi.org/10.9753/icce.v33.sediment.57

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References

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APPLICABILITY OF SUSPENDED SEDIMENT CONCENTRATION FORMULAE TO LARGE-SCALE BEACH MORPHOLOGICAL CHANGES

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