Results 21 to 30 of about 1,030 (174)
Monitoring dry snow metamorphism using 4D tomography across 20 experimental conditions [PDF]
Earth System Science DataRefined observations of the temporal evolution of snow microstructure are crucial for improving the understanding and modeling of snow metamorphism. X-ray tomography has opened new possibilities for observing the microstructure of dry snow by enabling 3D
O. Dick +3 more
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Anisotropy of seasonal snow measured by polarimetric phase differences in radar time series [PDF]
The Cryosphere, 2016 The snow microstructure, i.e., the spatial distribution of ice and pores, generally shows an anisotropy which is driven by gravity and temperature gradients and commonly determined from stereology or computer tomography.
S. Leinss +5 more
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Microstructure-based modeling of snow mechanics: a discrete element approach [PDF]
The Cryosphere, 2015 Rapid and large deformations of snow are mainly controlled by grain rearrangements, which occur through the failure of cohesive bonds and the creation of new contacts. We exploit a granular description of snow to develop a discrete element model based on
P. Hagenmuller, G. Chambon, M. Naaim
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Sodankylä manual snow survey program [PDF]
Geoscientific Instrumentation, Methods and Data Systems, 2016 The manual snow survey program of the Arctic Research Centre of the Finnish Meteorological Institute (FMI-ARC) consists of numerous observations of natural seasonal taiga snowpack in Sodankylä, northern Finland.
L. Leppänen +4 more
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Enhancing simulations of snowpack properties in land surface models with the Soil, Vegetation and Snow scheme v2.0 (SVS2) [PDF]
Geoscientific Model DevelopmentSnow microstructure – characterized by density, grain size, grain shape and arrangement – fundamentally determines snowpack macroscopic properties.
V. Vionnet +14 more
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Changes in microstructure of snow under large deformations [PDF]
Journal of Glaciology, 1991 AbstractA set of microstructural variables is selected to characterize the behavior of snow. Corresponding mathematical relations from quantitative stereology theory are presented along with relations and techniques required for numerical evaluation. An experimental investigation is carried out to determine changes in these variables for snow subjected
Michael Q. Edens, Robert L. Brown
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Journal of Glaciology, 2017 The instrumented sample holder Snowbreeder 5 is used to investigate the simultaneous influence of settlement on temperature-gradient snow metamorphism in time-lapse micro-computed tomography experiments.
MAREIKE WIESE, MARTIN SCHNEEBELI
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Using Ultrasonic Waves to Determine the Microstructure of Snow
Frontiers in Earth Science, 2020 Acoustic signals interact with the physical structure of porous media, are particularly sensitive to porosity and tortuosity, and can be used to measure physical properties in a non-destructive manner. Given the fragile nature of freshly fallen snow, non-contact, non-destructive characterization methods made possible via acoustic signals, are desirable.
Ross Lieblappen +5 more
openaire +2 more sources
Early-stage interaction between settlement and temperature-gradient metamorphism
Journal of Glaciology, 2017 Snow metamorphism and settlement change the microstructure of a snowpack simultaneously. Past experiments investigated snow deformation under isothermal conditions. In nature, temperature gradient metamorphism and settlement often occur together.
MAREIKE WIESE, MARTIN SCHNEEBELI
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A general treatment of snow microstructure exemplified by an improved relation for thermal conductivity [PDF]
The Cryosphere, 2013 Finding relevant microstructural parameters beyond density is a longstanding problem which hinders the formulation of accurate parameterizations of physical properties of snow.
H. Löwe, F. Riche, M. Schneebeli
doaj +1 more source