Keywords
Morphogy Change
Sediment Suspension
How to Cite
Abstract
A beach morphology model based on sediment suspension and settlement is applied to a system of seven submerged groins, which have a function of reducing the speed of longshore currents and controlling beach erosion. Nearshore currents are computed with the PEGBIS model by Goda (2004) for directional random wave transformation, and beach morphology is estimated with the suspended sediment transport model by Katayama and Goda (2003) with a new suspension coefficient by Goda (2010). The computation indicates the efficacy of a submerged groin system for beach erosion control. Discussions are made on some aspects of the submerged groin system to be clarified through further investigations.References
Aminti, P. L., C. Cammelli, L. E. Cipriani, and E.Pranzini. 2001. Evaluating the effectiveness of a submerged groin as soft shore protection. Proc. 1st Conf. Soft Shore Protection, Patras, Greece, 151-158.
Aminti, P. L., L. Cappietti, C. D'Elso, and E. Mori. 2009. Numerical simulation of an experimental submerged groin system, Coastal Structures 2007 (Proc. 5th Int. Conf., Venice, World Scientific), pp. 1511-1519.
Del Valle, R. Medina, and M. A. Losada. 1993. Dependence of coefficient K on grain size, J. Waterway Port, Coastal, and Ocean Eng., 119 (5), 568-574. http://dx.doi.org/10.1061/(ASCE)0733-950X(1993)119:5(568)
Goda, Y. 2000. Random Seas and Design of Maritime Structures (2nd Ed.), World Scientific, Singapore, 29-34. PMid:11016830
Goda, Y. 2004. A 2-D random wave transformation model with gradational breaker index, Coastal Engineering Journal, 46, (1), 1-38. http://dx.doi.org/10.1142/S0578563404000884
Goda, Y. 2006. Examination of the influence of several factors on longshore current computation with random waves, Coastal Engineering, 53 (2-3), 157-170. http://dx.doi.org/10.1016/j.coastaleng.2005.10.006
Goda, Y. 2008. Wave setup and longshore currents induced by directional spectral waves: Prediction formulas based on numerical computation results. Coastal Engineering Journal, 50 (4), 397-440http://dx.doi.org/10.1142/S0578563408001880
Goda, Y., N. Ono, and Y. Uno. 2009. Examination of efficacy of submerged groin system against beach erosion through numerical simulation, Coastal Dynamics 2009 (Proc. 6th Int. Conf., Tokyo, World Scientific), Paper No. 41 in CD ROM, 13p.
Goda, Y. 2010. Quantitative assessment of sediment pickup rate within surf zone based on large-scale data, J. Coastal Engineering, JSCE, Vol. 57, pp. 421-425 (in Japanese), also to be presented at Coastal Sediments 2011 to be held in Miami, USA.
Goudas, C. L., G. A. Katsiaris, G. Labeas, G. Karahalios, and G. Pnevmatikos. 2001. Soft protection using submerged groin arrangements - dynamic analysis of system stability and review of application impacts, Proc. 1st Conf. Soft Shore Protection, Patras, Greece, 167-186.
Holmberg, D. 2001. Alternative to traditional ways of treating shoreline erosion, Proc. 1st Conf. Soft Shore Protection, Patras, Greece, 139-150.
Katayama, H. and Y. Goda. 2000. A sediment pickup rate formula based on energy dissipation rate by random breaking, Proc. 27th Int. Conf. Coastal Eng., Sydney, ASCE, 2859-2872.
Katayama, H. and Y. Goda. 2003. 2DH beach changes due to suspended sediment picked-up by random breaking waves, Coastal Engineering 2002 (Proc. 28th Int. Conf., Cardiff, Wales, World Scientific), pp. 2767-2779.
Larson, M. and N.C. Kraus. 1991. Numerical model of longshore current for bar and trough beaches, J. Waterway, Port, Coastal, and Ocean Eng., 117 (4), 326-347. http://dx.doi.org/10.1061/(ASCE)0733-950X(1991)117:4(326)
Nishimura, H. 1982. Numerical simulation of nearshore circulations, Proc. 29th Japanese Conf. Coastal Eng., 333-337 (in Japanese).
Tajima, Y. and O.S. Madsen. 2003. Modeling near-shore waves and surface roller, Proc. 2nd Int. Conf. Asian and Pacific Coasts (APAC 2003), Makuhari, Chiba, 2003, Japan, Paper No. 28 in CD-ROM, 12p.