Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using a supercritical flow model

doi:10.1007/s11709-014-0235-0

Front. Struct. Civ. Eng.

2014, Vol. 8

Issue (1) : 57-68 https://doi.org/10.1007/s11709-014-0235-0

RESEARCH ARTICLE

Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using a supercritical flow model

Soumendra Nath KUIRY¹, Yan DING²(

), Sam S Y WANG²

¹. Environmental & Water Resources Engineering Division, Department of Civil Engineering, Indian Institute of Technology Madras, Tamil Nadu 600036, India
². National Center for Computational Hydroscience and Engineering, The University of Mississippi, University, MS 38677, USA

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Abstract

In this paper, an advanced explicit finite volume flow model in two-dimensions is presented for simulating supercritical coastal flows and morphological changes in a tidal/coastal inlet and barrier islands due to storm surges and waves. This flow model is coupled with existing wave-action model and sediment transport model. The resulting integrated coastal process model is capable of simulating flows induced by extreme conditions such as waves, surge tides, river flood flows, etc., and morphological changes induced by rapid coastal currents and waves. This developed supercritical flow model is based on the solution of the conservative form of the nonlinear shallow water equations with the effects of the Coriolis force, uneven bathymetry, wind stress, and wave radiation stresses. The forward Euler scheme is used for the unsteady term; and the convective term is discretized using the Godunov-type shock-capturing scheme along with the HLL Riemann solver on non-uniform rectilinear grids. The accuracy of the developed model is investigated by solving an experimental dam-break test case. Barrier island breaching, overflow and overwash due to severe storm attack are simulated and the predicted morphological changes associated to the events are analyzed to investigate the applicability of the model in a coast where all the physical forces are present.

Keywords coastal inlet coastal process modeling supercritical flow sediment transport barrier islands

Corresponding Author(s): Yan DING

Issue Date: 05 March 2014

Cite this article:

Soumendra Nath KUIRY,Yan DING,Sam S Y WANG. Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using a supercritical flow model[J]. Front. Struct. Civ. Eng., 2014, 8(1): 57-68.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0235-0
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I1/57

Fig.1 Definition sketch for bed topography, water depth and water surface elevation

Fig.2 Discretization of a finite volume cell. (a) Interfaces; (b) numerical fluxes

Fig.3 Geometry and gauge locations for the experimental and model set up

Fig.4 Computed and measured water depth variations at stations. (a) G4; (b) G10; (c) G11; (d) G13; (e) G20

Fig.5 Idealized coastal inlet with initial bathymetry

Fig.6 Storm surge imposed at offshore boundary

Fig.7 Computed results at t = 19?h. (a) Bed elevation change; (b) velocity vectors

Fig.8 Computed results at t = 27?h. (a) Bed elevation change; (b) velocity vectors

Fig.9 Computed bed profile at different times along the transect A-A as shown in Fig. 5

Fig.10 Idealized coastal inlet with initial bathymetry and barrier island

Fig.11 Bed morphological changes at (a) a flood tide at t = 19?h and (b) an ebb tide at t = 27?h

Fig.12 Computed bed profiles at different times along the transects. (a) A-A; (b) B-B; (c) C-C as shown in Fig. 10

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