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Titolo:
Measurements and modeling of swash-induced pressure gradients in the surface layers of a sand beach
Autore:
Baldock, TE; Baird, AJ; Horn, DP; Mason, T;
Indirizzi:
Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London SW7 2BU, England Univ London Imperial Coll Sci Technol & Med LondonEngland SW7 2BU gland Univ Sheffield, Dept Geog, Sheffield S10 2TN, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S10 2TN S Yorkshire, England Britannia Royal Naval Coll, Dept Marine Studies, Dartmouth TQ6 OHJ, England Britannia Royal Naval Coll Dartmouth England TQ6 OHJ th TQ6 OHJ, England Univ London, Birkbeck Coll, Sch Geog, London W1P 2LL, England Univ LondonLondon England W1P 2LL ll, Sch Geog, London W1P 2LL, England
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C2, volume: 106, anno: 2001,
pagine: 2653 - 2666
SICI:
0148-0227(20010215)106:C2<2653:MAMOSP>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEDIMENT TRANSPORT; AIR ENCAPSULATION; BED; FLUID; ZONE; INFILTRATION; RESPONSES; BEHAVIOR; VELOCITY; STRESSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Baldock, TE Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London SW7 2BU, England Univ London Imperial Coll Sci Technol & Med London England SW7 2BU
Citazione:
T.E. Baldock et al., "Measurements and modeling of swash-induced pressure gradients in the surface layers of a sand beach", J GEO RES-O, 106(C2), 2001, pp. 2653-2666

Abstract

Field measurements of swash-induced hydraulic (pressure) gradients in the surface layers of a sand beach are presented and compared to a one-dimensional diffusion model. The model provides a description of flow through a porous, quasi-saturated sediment and is driven by the time-varying swash depthon the beach surface. The field measurements broadly show four different types of pressure propagation behavior, which appear dependent on cross-shore position in the swash zone. The hydraulic gradients within the surface layers of the beach are typically found to be much greater than those likely to be generated by tidally-induced groundwater now. In these instances the diffusion model generally provides a good description of the data. However,very large hydraulic gradients are frequently observed just below the beach surface, and these cannot be adequately described by the diffusion model. A mechanism is proposed through which these large hydraulic gradients could be generated.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:24:48