A LONG-TERM EQUILIBRIUM BEACH PLANFORM MODEL FOR COASTAL WORK DESIGN

Verónica Cánovas, Raúl Medina

Abstract


Traditional models usually allow fitting the equilibrium beach planform of crenulated beaches knowing wave climate characteristics at a control point. However, sometimes there are shoals or bars in the surf zone which affect surf zone dynamics and longshore sediment distribution, and it is difficult to take into account these elements using those traditional models. A long-term equilibrium beach planform model is proposed here based on sediment transport equations. This model takes into account the sediment transport due to oblique wave incidence and that due to wave height gradient. Two case studies have been studied: a simple pocket beach and a beach which is sheltered by a sandstone bar. Results show the model fits reasonably well the equilibrium beach planform to the shorelines of those beaches. This model is more suitable than traditional models when there are elements affecting surf zone dynamics.

Keywords


static equilibrium beach planform; height gradient; oblique incidence; longshore sediment transport; porous concrete; breaking wave

References


González, M. 1995. Morfología de playas en equilibrio. Planta y perfil, Tesis doctoral, Departamento de Ciencias y Técnicas del Agua y del Medio Ambiente, Universidad de Cantabria, 270 pp.

González, M., R. Medina, J. González-Ondina, A.F. Osorio, F.J. Méndez, and E. García. 2007. An integrated Coastal Modeling System for analyzing Beach processes and beach restoration projects, SMC, Computers & Geosciences, 33 (7), 916-931.http://dx.doi.org/10.1016/j.cageo.2006.12.005

Hsu, J.R.C, and C. Evans. 1989. Parabolic bay shapes and applications, Institution of Civil Engineers Proceedings, ICE, 556-570.

Kraus, N.C. and S. Harikai. 1983. Numerical model of the shoreline change at Oarai beach, Coastal Engineering, 7, 1-28.http://dx.doi.org/10.1016/0378-3839(83)90024-8

Ozasa, H. and A.H. Brampton. 1980. Mathematical modeling of beaches backed by seawalls, Coastal Engineering, 4, 47-63.http://dx.doi.org/10.1016/0378-3839(80)90005-8

Silvester, R. and J.R.C. Hsu. 1993. Coastal Stabilization: Innovative Concepts, Prentice-Hall, Englewood Cliffs, New Jersey, 578 pp.

PMCid:372911

Tan, S. and Y. Chiew. 1994. Analysis of bayed beaches in static equilibrium, Journal of Waterway, Port, Coastal, and Ocean Engineering, 120 (2), 145-153.http://dx.doi.org/10.1061/(ASCE)0733-950X(1994)120:2(145)


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