Laser induced fluorescence - particle tracking velocimetry (lif-ptv) measurements of water flow through snow

B. Walter, S. Horender, N. Wever, C.B. Gromke, M. Lehning

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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.
Original languageEnglish
Title of host publicationProceedings of the International Snow Science Workshop (ISSW 2012), September 16-21, 2012, Anchorage, Alaska
Place of PublicationAnchorage
Publication statusPublished - 2012

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