- flow
regime bedforms. As a result,
antidunes migrate in an
upstream direction,
counter to the
current flow.
Antidunes are
called in-phase bedforms, meaning...
- the
dunes become flattened out, and then
produce antidunes. At
higher still velocity, the
antidunes are
flattened and most
sedimentation stops, as erosion...
- the cross-beds of a dune and the cross-beds of an
antidune. (Dunes dip
downstream while antidunes dip upstream.) The
direction of
motion of the cross-beds...
-
increasing the
overall understanding of
these currents. Some of the
largest antidunes on
Earth are
formed by
turbidity currents. One
observed sediment-wave...
-
giant current ripples are large-to-very-large
subaqueous gravel dunes and
antidunes.
Although they once
covered a
significantly larger area, they
cover about...
- pool
Thalweg Bedrock river Canyon Knickpoint Plunge pool
Bedforms Ait
Antidune Dune
Current ripple Regional processes Aggradation Base
level Degradation...
- pool
Thalweg Bedrock river Canyon Knickpoint Plunge pool
Bedforms Ait
Antidune Dune
Current ripple Regional processes Aggradation Base
level Degradation...
-
motion can
create self-organized
structures such as ripples, dunes, or
antidunes on the
river or
stream bed.
These bedforms are
often preserved in sedimentary...
-
plane bed High Flat laminae, +/-
aligned grains (parting lineations)
Antidunes Low
Water in
phase with bedform, low angle,
subtle laminae Pool and chute...
-
sedimentary structures typical of high-velocity flow, such as
dunes and
antidunes.
Volcanic ash
already deposited on the
surface can be
transported as mud...
