Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Discrete particle model for sheet flow sediment transport in the nearshore
Autore:
Drake, TG; Calantoni, J;
Indirizzi:
N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 her Sci, Raleigh, NC 27695 USA N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 pt Phys, Raleigh, NC 27695 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C9, volume: 106, anno: 2001,
pagine: 19859 - 19868
SICI:
0148-0227(20010915)106:C9<19859:DPMFSF>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
WAVE BOUNDARY-LAYERS; BED-LOAD TRANSPORT; SALTATING GRAINS; SHEAR-STRESS; FLUID; SIMULATIONS; TURBULENCE; ASSEMBLIES; BISPECTRA; PROFILES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Drake, TG N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Box 8208, Raleigh, NC 27695 USA N Carolina State Univ Box 8208 Raleigh NC USA 27695 NC 27695 USA
Citazione:
T.G. Drake e J. Calantoni, "Discrete particle model for sheet flow sediment transport in the nearshore", J GEO RES-O, 106(C9), 2001, pp. 19859-19868

Abstract

Fully three-dimensional discrete particle computer simulations of high-concentration sheet flow transport in oscillatory flows quantify the effect offluid acceleration on bed load transport in highly unsteady flows typical of nearshore marine environments. A simple impulse-momentum approach explains simulation results and forms the basis for adding an acceleration-related term to widely used energetics sediment transport formulae. Transport predicted by the acceleration term becomes increasingly significant as wave shape approaches the sawtooth profile characteristic of surf zone bores. Simulations integrate F=ma and a corresponding set of equations for the torquesfor each sphere. Normal and tangential forces between contacting particlesare linear functions of the distance between sphere centers and the relative tangential displacement at the contact point, respectively; particle interactions are both inelastic and frictional. Pressure gradient forces generated by the passage of surface gravity waves drive fluid and particle motion in a stack of thin horizontal fluid layers that exchange momentum and exert fluid drag, added mass, and buoyancy forces on particles. Transport properties of the simulated granular-fluid assemblage are robust to large variations in material properties of the particles. Simulated transport rates agree with available experimental data for unsteady transport of coarse sands; the mode of bed load motion, dispersion of bed load particles, and particle segregation by size and density are qualitatively consistent with available particle-scale observations of bed load transport of natural particles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 11:35:39