Mots-clés
Arctique ; Drainage sous-glaciaire ; Débit ; Eau de fonte ; Glacier ; Géométrie hydraulique ; Hydrogéologie ; Hydrologie appliquée ; Modèle ; Rugosité ; Svalbard ; Zone froideApplied hydrology ; Arctic Region ; Channel geometry ; Cold area ; Discharge ; Glacier ; Hydrogeology ; Meltwater ; Model ; Roughness ; Subglacial drainage ; SvalbardAgua de deshielo ; Caudal ; Geometria hidráulica ; Helero ; Hidrogeología ; Hidrología aplicada ; Modelo ; Rugosidad ; Zona fría ; ÁrticaLarge values of hydraulic roughness in subglacial conduits during conduit enlargement : implications for modeling conduit evolution
Auteur(s) et Affiliation(s)
GULLEY, J.D.
Michigan Technological Univ., Dept. of Geological and Mining Engineering and Sciences, Houghton, Etats-Unis
SPELLMAN, P.D.
Michigan Technological Univ., Dept. of Civil and Environmental Engineering, HOUGHTON, Etats-Unis
COVINGTON, M.D.
Dept. of Geosciences, Univ. of Arkansas, Etats-Unis
MARTIN, J.B.
Dept. of Geological Sciences, Univ. of Florida, Gainesville, Etats-Unis
BENN, D.I.
Univ. Centre in Svalbard (UNIS), Dept. of Arctic Geology, Norvege
CATANIA, G.
Inst. for Geophysics, Univ. of Texas, Etats-Unis
Description :
In this paper, the AA. calculated values for 2 roughness parameters, the Darcy–Weisbach friction factor (f) and the Manning roughness coefficient (n), using dye tracing data from a mapped subglacial conduit at Rieperbreen, Svalbard. Values of f and n calculated from dye traces were compared with values of f and n calculated from commonly used relationships between surface roughness heights and conduit hydraulic diameters. Equations that calculate roughness parameters from surface roughness heights underpredicted values of f by as much as a factor of 326 and values of n by a factor of 17 relative to values obtained from the dye tracing study. The AA. argue these large underpredictions occur because relative roughness in subglacial conduits during the early stages of conduit enlargement exceeds the 5% range of relative roughness that can be used to directly relate values of f and n to flow depth and surface roughness heights. Simple conduit hydrological models presented here show how parameterization of roughness impacts models of conduit discharge and enlargement rate.
Type de document :
Article de périodique
Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 3, p. 296-310, nombre de pages : 15, Références bibliographiques : 1 p.
Date :
2014
Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)