Publication

Numerical simulation of wave motion and its interaction with groundwater flow in coastal aquifers

2009
Posters

Résumé

Groundwater regime has an important role in coastal sediment transport near the coast and beach profile changes. Hitherto, accurate and complete nature of the interaction between wave motions, underground water and beach sediment transport is not yet known. Most existing numerical models for studying the beach groundwater are related to the tidal forces. In this study, interaction of fresh groundwater, salt transport and wave motion was investigated via the process-based model. The hydrodynamic part is computed using the Navier-Stockes equations in conjunction with a k-ε closure turbulence model and Volume of Fluid (VOF) technique. The bed deformation is calculated using empirical sediment transport formula according the influence of watertable changes. Furthermore, the wave-induced watertable fluctuations and effects of infiltration/exfiltration on the nearshore sediment transport are discussed. The groundwater flow and salt transport are considered based on density-variable model. The results reveal that in the surf zone, the sediment transport rate increases towards the shore until the wave breaks whereas in the swash zone it decreases and the greatest erosion takes place in the vicinity of the wave breaking point.

Source officielle

https://infoscience.epfl.ch/entities/publication/a28bbd2b-7f0d-455f-b606-41c3fba99cbe

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2009
Posters

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/a28bbd2b-7f0d-455f-b606-41c3fba99cbe

À propos de ce résultat

Concepts associés (32)

Sediment transport

Sediment transport is the movement of solid particles (sediment), typically due to a combination of gravity acting on the sediment, and the movement of the fluid in which the sediment is entrained. Sediment transport occurs in natural systems where the particles are clastic rocks (sand, gravel, boulders, etc.), mud, or clay; the fluid is air, water, or ice; and the force of gravity acts to move the particles along the sloping surface on which they are resting.

Eau souterraine

vignette|LŒil du Néez (Rébénacq, Pyrénées-Atlantiques) est une émergence karstique captée par la ville de Pau. Les eaux souterraines sont toutes les eaux se trouvant sous la surface du sol, dans la zone de saturation et en contact direct avec le sol ou le sous-sol. En tant que ressource naturelle vitale et plus ou moins renouvelable et parfois transfrontalières, ces eaux posent des questions juridiques particulières. C'est parfois une source de conflit inter ethnique ou entre pays.

Sedimentary budget

Sedimentary budgets are a coastal management tool used to analyze and describe the different sediment inputs (sources) and outputs (sinks) on the coasts, which is used to predict morphological change in any particular coastline over time. Within a coastal environment the rate of change of sediment is dependent on the amount of sediment brought into the system versus the amount of sediment that leaves the system. These inputs and outputs of sediment then equate to the total balance of the system and more than often reflect the amounts of erosion or accretion affecting the morphology of the coast.

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Publications associées (17)

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Numerical simulation of wave motion and its interaction with groundwater flow in coastal aquifers

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