3.6 PROGRESSIVE BEDFORM DEVELOPMENT & BEDFORMS IN UNIDIRECTIONAL & OSCILLATORY FLOWS Flashcards
1
Q
What is the grain size range for ripple formation?
A
< 600-700 micrometers
coincides with upper limit of stability of laminar/viscous sublayer
2
Q
What is the wavelength range for ripple formation?
A
0.05-0.4m
3
Q
What is the wave height range for ripple formation?
A
0.005-0.03m
4
Q
What is the “ripple index”?
A
wavelength / H
range 10-40
ripple migration rate 1-2mm/minute
5
Q
What is the wavelength range for dunes?
A
0.6-100m+
6
Q
What is the wave height range for dunes?
A
0.05-10m+
7
Q
What is the dune development time range?
A
10 mins - 10 days
8
Q
What are climbing ripples?
A
Where the angle of climb increases with rate of deposition
9
Q
What are the 3 types of 3D cross bedding sets?
A
Tabular, wedge-shaped and trough-shaped
