Abstract
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) =2/3d{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/cm3) 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.
