The relative importance and dominance between the forces (inertial, frictional and viscous) in a debris flow are characterized by dimensionless numbers such as Bagnold number, Savage number, Friction number etc. For calculation, we need flow depth and Interstitial fluid viscosity along with other parameters. So here I would like to ask, which flow depth we need to measure. Is it the point data where we have fixed the sensor or do we need the average depth?
Regarding the interstitial fluid viscosity, how to measure this parameter. Do we need to do rheometry or do we have any empirical formula to calculate the viscosity of a debris flow mixture.
Don't guess you need the flow depth, the flow rate or Re number give better information regarding this area. To get the viscosity, you can either find it from references, or measure it via the viscometer or calculate it if it combined fluid.
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