Item: Laser Induced Fluorescence - Particle Tracking Velocimetry (LIF-PTV) Measurements of Water Flow Through Snow
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Title: Laser Induced Fluorescence - Particle Tracking Velocimetry (LIF-PTV) Measurements of Water Flow Through Snow
Proceedings: Proceedings, 2012 International Snow Science Workshop, Anchorage, Alaska
Authors:
- B. Walter [ WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland ]
- S. Horender [ WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland ]
- N. Wever [ WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland ]
- C. Gromke [ Unit Building Physics and Systems, Eindhoven Un iversity of Technology, Eindhoven, Netherlands ]
- M. Lehning [ WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland ] [ CRYOS, Civil and Environmental Engineering, École Polytechnique Fédéral de Lausanne, Switzerland ]
Date: 2012
Abstract: LIF-PTV-measurements of the micro-scale water flow through the pore space of a wet snow sample driven by either gravitational or capillary forces are presented. For the measurements, fluorescent micron-sized particles in the water are illuminated with a laser light sheet and tracked with a high-speed camera. The results show the existence of a potential preferential flow path and a loop flow in a pore space in case of a gravity driven flow. Generally, the water flow is found to be highly 3-dimensional. The average flow velocities in the pore spaces are 11.3 mm/s for the gravity driven flow and 9.6 mm/s for the upward flow driven by capillary forces. Flow acceleration and deceleration was stronger for the gravity driven flow with particle decelerations stronger than accelerations in both cases.
Object ID: issw-2012-1023-1027.pdf
Language of Article: English
Presenter(s): unknown
Keywords: wet snow avalanches, glide avalanche, pore space
Page Number(s): 1023-1027
Subjects: velocimetry wet snow avalanches
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