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Titre du document / Document title

Modeling impacts of Louisiana barrier islands on wetland hydrology

Auteur(s) / Author(s)

SUHAYDA J. N. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, ETATS-UNIS

Résumé / Abstract

Management and restoration of natural systems requires the quantitative assessment of the impact and cost effectiveness of management alternatives. This paper provides a description of the methodology being used in Louisiana to evaluate the role of barrier islands in influencing wetland hydrology and some preliminary results. The steps that were taken to develop the methodology are reviewed. The objective of the evaluation was to determine the effect of barrier island geometry on the duration and depth of inundation of coastal wetlands under average and extreme conditions. The model selected for use was the overland flooding model developed by the Federal Emergency Management Agency to predict hurricane flood elevations for the National Flood Insurance Program. The model uses an explicit, two dimensional, spaced staggered, finite difference scheme to simulate the flow of water caused by tides and wind systems. The current size of the inlets between the islands is several times the equilibrium area based upon the tidal prisms. Slight reductions in the cross sectional areas of the inlets between the islands had only a very minor effect on reducing the depth and duration of wetland flooding. If the barrier islands were removed from the model, the depth and duration of tidal flooding slightly increased. Under extreme conditions, the island height and inlet size did have a significant effect on the depth and duration of wetland flooding. Hurricane Andrew produced a maximum surge elevation at Cocodrie of about 2.7 m. The predicted surge elevation at Cocodrie would have been about .3 m higher if the present barrier islands were destroyed and would have been as much as 1.2 to 1.5 m lower if the barrier islands were raised and the inlets narrowed.

Revue / Journal Title

Journal of coastal research    ISSN  0749-0208   CODEN JCRSEK 

Source / Source

Congrès
Louisiana's Barrier Islands : An Evaluation of their Geological Evolution, Morphodynamics and Rapid Deterioration. Workshop, New Orleans , ETATS-UNIS (04/1995)
1997, vol. 13, no 3, pp. 591-710 (25 ref.), [Notes: Selected papers], pp. 686-693

Langue / Language

Anglais

Editeur / Publisher

Coastal Education and Research Foundation, Lawrence, KS, ETATS-UNIS  (1985) (Revue)

Mots-clés anglais / English Keywords

Louisiana

;

Gulf of Mexico

;

impact statements

;

cost

;

hydrology

;

wetlands

;

geometry

;

depth

;

management

;

tides

;

inlets

;

barrier islands

;

models

;

environment protection

;

floods

;

two-dimensional models

;

finite difference analysis

;

hurricanes

;

estuarine environment

;

digital simulation

;

United States

;

North America

;

North American Atlantic

;

Northwest Atlantic

;

North Atlantic

;

Atlantic Ocean

;

Mots-clés français / French Keywords

Louisiane

;

Golfe du Mexique

;

Etude impact milieu

;

Coût

;

Hydrologie

;

Terrain humide

;

Géométrie

;

Profondeur

;

Gestion

;

Marée

;

Bras mer

;

Ile barrière

;

Modèle

;

Protection environnement

;

Crue

;

Modèle 2 dimensions

;

Analyse différence finie

;

Ouragan

;

Milieu estuaire

;

Simulation numérique

;

Etats Unis

;

Amérique du Nord

;

Océan Atlantique Nord Américain

;

Océan Atlantique Nord Ouest

;

Océan Atlantique Nord

;

Océan Atlantique

;

Mots-clés espagnols / Spanish Keywords

Luisiana

;

Golfo de Mejico

;

Estudio impacto medio

;

Costo

;

Terreno húmedo

;

Geometría

;

Profundidad

;

Gestión

;

Marea

;

Brazo mar

;

Isla barrera

;

Modelo

;

Protección medio ambiente

;

Crecida

;

Modelo 2 dimensiones

;

Huracán

;

Medio estuario

;

Simulación numérica

;

Estados Unidos

;

America del norte

;

Océano Atlántico Norte

;

Océano Atlántico

;

Localisation / Location

INIST-CNRS, Cote INIST : 20944, 35400006792213.0090

Nº notice refdoc (ud4) : 2791002



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