A study of methods to estimate debris flow velocity |
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| Authors: | Adam B Prochaska Paul M Santi Jerry D Higgins Susan H Cannon |
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| Institution: | (1) Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois Street, Golden, CO 80401, USA;(2) US Geological Survey, P.O. Box 25046, Mail Stop 966, Denver, CO 80225-0046, USA |
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| Abstract: | Debris flow velocities are commonly back-calculated from superelevation events which require subjective estimates of radii
of curvature of bends in the debris flow channel or predicted using flow equations that require the selection of appropriate
rheological models and material property inputs. This research investigated difficulties associated with the use of these
conventional velocity estimation methods. Radii of curvature estimates were found to vary with the extent of the channel investigated
and with the scale of the media used, and back-calculated velocities varied among different investigated locations along a
channel. Distinct populations of Bingham properties were found to exist between those measured by laboratory tests and those
back-calculated from field data; thus, laboratory-obtained values would not be representative of field-scale debris flow behavior.
To avoid these difficulties with conventional methods, a new preliminary velocity estimation method is presented that statistically
relates flow velocity to the channel slope and the flow depth. This method presents ranges of reasonable velocity predictions
based on 30 previously measured velocities. |
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| Keywords: | Debris flow Velocity Superelevation Mitigation Design |
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