Debris Flows (Hillslope transport) Flashcards
Lecture 9 Friday 9/13
1
Q
What does strain rate do to an object?
A
High strain rate = brittle
Low strain rate = flows
2
Q
How are debris flows and silly putty similar?
A
in a water channel, water is a material that has a linear relationship with shear stress and strain rate
- slope is determined by fluid viscosity
3
Q
How does the mud in a debris flow behave?
A
- silly putty
-strain hardens - Bingham plastic
4
Q
What is the velocity profile?
A
strain rate: the change in velocity with respect to z
5
Q
what is U?
A
velocity
6
Q
What is this equation used for?
Umax = ρgsinα (h-(k/ρgsinα))/2μ
A
gets applied to debris flows, the velocity that mud is moving so that it strain hardens and becomes a battering ram
- models debris flows
7
Q
What is τc?
A
k or critical shear stress
