When analyzing of debris flow mechanism, it is important to consider not only dilatant stress but also Reynolds stress. In this paper, firstly a model
to describe debris flow was built theoretically, and experiments were carred out.
From the theoretical consideration, the following equation was obtained on the velocity distribution of debris flow:
u(
y) =2/3
d{
A/
B+
C}
1/2{
h3/2-(
h-
y)
3/2}
Where,
A=
Cd(
o-ρ)
gsinθ
B=
ai{(
C*/
Cd)
1/3-1}
-2sinα
C=ρ{(1-
Cd) /
Cd}
In which,
Cd: Sediment concentration
σ: Density of materials
ρ: Density of water
g: Gravity acceleration
θ: Slope of channel
ai: Coefficient concering impact angle of materials
C*: Concentration of deposit materials
h: Depth of debris flow
y: Distance from channel bed
Using light materials (mesalite σ=1. 6g/cm
3) and natural sands, the experiments were conducted to examin the applicability of the egation. It was found that the egation show good agreement with the experimental results.
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