Styles of
bend
migration
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Bend Migration - Stratigraphy - Lecture Slides, Slides of Geology
In these Lecture Slides, the Lecturer has discussed the following key points in his class of Stratigraphy : Bend Migration, Styles, Section Orientation, Expansion, Rotation, Translation, Wavelength Change, Sediment Body, Lateral Accretion, Outcrop
Typology: Slides
2012/2013
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Styles of
bend migration
LATERAL ACCRETION SURFACES
Bend Migration and Section Orientation
(Willis, 1989)
Expansion
Translation
Rotation
Wavelength change
Down-valley translating meander bends
Î
Lateral-accretion bedset surfaces correspond to migration steps Î^
Stippled lines denote lines of equal mean grain size Î
Arrows denote local flow directions (
up = into section, down = out of section
)
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Expanding meander bends
Î
Same simulation parameters as in previous example
35
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Finally, paleohydraulics:
empirical
relationships between meandering river parameters and flow discharge
(for sinuosities > 1.7)
= 10.9 w
1.
w = channel width h = channel depth
w = 6.8 h
1.
= 106 Q
0.
Q
= mean annual discharge λ^
= meander wavelength
Summary
•Stratasets and formative bedforms •Bend flow processes •The ‘classic’ meandering rivers facies model •Complications and additions to this model (cut-off, floodplain, migration pattern etc) •Preservation and orientation of sections •Is there a definitive ‘meandering river’ facies?