Velocity profiles and basal stresses in natural debris flows. Issue 8 (5th March 2020)

• Record Type: Journal Article
• Authors: Nagl, Georg; Hübl, Johannes; Kaitna, Roland
• Is Part Of: Earth surface processes and landforms. Volume 45:Issue 8(2020)
• Page Start: 1764
• Page End: 1776
• Publication Date: 2020-03-05
• Subjects: debris flow -- velocity profile -- normal stress -- pore fluid pressure -- field measurements -- shear rate; Geomorphology -- Periodicals; 551.4
• DOI: 10.1002/esp.4844
• Languages: English
• ISSNs: 0197-9337

Abstract

Abstract: The internal deformation within debris flows holds essential information on dynamics and flow resistance of such mass‐wasting processes. Systematic measurements of velocity profiles in real‐scale debris flows are not yet available. Additionally, data on basal stresses of the solid and the fluid phase are rare. Here, we present and analyse measurements of vertical velocity profiles in two debris flows naturally occurring in the Gadria Creek, Italy. The method is based on cross‐correlation of paired conductivity signals from an array of sensors installed on a fin‐shaped wall located in the middle of the channel. Additionally, we measure normal stress and pore fluid pressure by two force plates with integrated pressure transducers. We find internal deformation throughout the flows. Only at the very front was some en‐bloc movement observed. Velocity profiles varied from front to tail and between flows. For one debris flow, pore fluid pressure close to normal stress was measured, whereas the other flow was less liquefied. The median shear rates were mostly less than 5 s −1 and Savage numbers at the basal layer ranged from 0.01 to 1. Our results highlight the variable nature of debris flows and provide quantitative data on shear rate and basal stress distribution to help guide model development for hazard assessment and landscape evolution. © 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. Abstract : We report on systematic measurements of vertical velocity profiles together with normal stress and pore fluid pressure in two natural debris‐flow events. We find non‐hydrostatic fluid pressures and strong variations of deformation vertically and along the flows.