A simple model of bedform migration
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A simple model of bedform migration. / Bartholdy, Jesper; Ernstsen, Verner Brandbyge; Flemming, Burg W; Winter, Christian; Bartholomä, Alex.
I: Earth Surface Processes and Landforms, Bind 35, Nr. 10, 2010, s. 1211-1220.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - A simple model of bedform migration
AU - Bartholdy, Jesper
AU - Ernstsen, Verner Brandbyge
AU - Flemming, Burg W
AU - Winter, Christian
AU - Bartholomä, Alex
PY - 2010
Y1 - 2010
N2 - A model linking subaqueous dune migration to the effective (grain related) shear stress is calibrated by means of flume data for bedform dimensions and migration rates. The effective shear stress is calculated on the basis of a new method assuming a near-bed layer above the mean bed level in which the current velocity accelerates towards the bedform crest. As a consequence, the effective bed shear stress corresponds to the shear stress acting directly on top of the bedform. The model operates with the critical Shields stress as a function of grain size, and predicts the deposition (volume per unit time and width) of naturally-packed bed material on the bedform lee side, qb(crest). The model is simple, built on a rational description of simplified sediment mechanics, and its calibration constant can be explained in accordance with estimated values of the physical constants on which it is based. Predicted values of qb(crest) correlate with measured values of bedform height multiplied by bedform migration rate with R-2 = 0.83. Copyright (C) 2010 John Wiley & Sons, Ltd
AB - A model linking subaqueous dune migration to the effective (grain related) shear stress is calibrated by means of flume data for bedform dimensions and migration rates. The effective shear stress is calculated on the basis of a new method assuming a near-bed layer above the mean bed level in which the current velocity accelerates towards the bedform crest. As a consequence, the effective bed shear stress corresponds to the shear stress acting directly on top of the bedform. The model operates with the critical Shields stress as a function of grain size, and predicts the deposition (volume per unit time and width) of naturally-packed bed material on the bedform lee side, qb(crest). The model is simple, built on a rational description of simplified sediment mechanics, and its calibration constant can be explained in accordance with estimated values of the physical constants on which it is based. Predicted values of qb(crest) correlate with measured values of bedform height multiplied by bedform migration rate with R-2 = 0.83. Copyright (C) 2010 John Wiley & Sons, Ltd
KW - bedload
KW - bedforms
KW - dune migration
KW - bedload model
KW - incipient motion
KW - SEDIMENT TRANSPORT
KW - TURBULENCE STRUCTURE
KW - SUBAQUEOUS DUNES
KW - FLOW
KW - RIVER
KW - RIPPLES
U2 - 10.1002/esp.2002
DO - 10.1002/esp.2002
M3 - Journal article
VL - 35
SP - 1211
EP - 1220
JO - Earth Surface Processes and Landforms
JF - Earth Surface Processes and Landforms
SN - 0197-9337
IS - 10
ER -
ID: 33233912