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(Article of periodic en Anglais - 2014)

Document title

Large values of hydraulic roughness in subglacial conduits during conduit enlargement : implications for modeling conduit evolution

Authors(s) and Affiliation(s)

GULLEY J.D. (1) ; SPELLMAN P.D. (2) ; COVINGTON M.D. (3) ; MARTIN J.B. (4) ; BENN D.I. (5) ; CATANIA G. (6) ;
(1) Michigan Technological Univ., Dept. of Geological and Mining Engineering and Sciences, Houghton, ETATS-UNIS
(2) Michigan Technological Univ., Dept. of Civil and Environmental Engineering, HOUGHTON, ETATS-UNIS
(3) Dept. of Geosciences, Univ. of Arkansas, ETATS-UNIS
(4) Dept. of Geological Sciences, Univ. of Florida, Gainesville, ETATS-UNIS
(5) Univ. Centre in Svalbard (UNIS), Dept. of Arctic Geology, NORVEGE
(6) Inst. for Geophysics, Univ. of Texas, ETATS-UNIS

Abstract

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

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no3 [pp. 296-310]

Bibliographic references : 1 p.

Collation : 11 fig., 5 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3447

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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