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2015 ; 5
(ä): 11390
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On the formation of current ripples
#MMPMID26065918
Bartholdy J
; Ernstsen VB
; Flemming BW
; Winter C
; Bartholomä A
; Kroon A
Sci Rep
2015[Jun]; 5
(ä): 11390
PMID26065918
show ga
For grain sizes finer than coarse sand, the first flow-transverse bedforms to
develop are current ripples. Although numerous studies have analysed different
aspects of bedform morphodynamics, to date no comprehensive physical explanation
for the formation of ripples has been given. We offer such an explanation based
on a virtual boundary layer concept, and present a model predicting ripple height
on the basis of grain size, current velocity and water depth. The model
contradicts the conventional view of current ripples as bedforms not scaling with
flow depth. Furthermore, it confirms the dependence of ripple dimensions on grain
size, and their relative insensitivity to flow strength.