A5028035131- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Icing and De-icing Technologies
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- nanoparticles nucleation surface interactions
- Heat and Mass Transfer in Porous Media
- Groundwater flow and contamination studies
- Gas Dynamics and Kinetic Theory
- Aeolian processes and effects
- NMR spectroscopy and applications
- Innovation Diffusion and Forecasting
- Particle Dynamics in Fluid Flows
- Aerodynamics and Fluid Dynamics Research
- Geophysical and Geoelectrical Methods
- Hydraulic Fracturing and Reservoir Analysis
- Lattice Boltzmann Simulation Studies
Norwegian University of Science and Technology
2024
Montana State University
2021-2024
ETH Zurich
2020-2021
Swiss Federal Institute for Forest, Snow and Landscape Research
2016
Abstract. Grain shape is commonly understood as a morphological characteristic of snow that independent the optical diameter (or specific surface area) influencing its physical properties. In this study we use tomography images to investigate two objectively defined metrics grain naturally extend characterization in terms diameter. One curvature length λ2, related third-order term expansion two-point correlation function, and other second moment μ2 chord distributions. We show exponential...
This study considers complex ice particles falling in the atmosphere: predicting drag of such is important for developing climate models parameterizations. A Delayed-Detached Eddy Simulation model developed to predict coefficient snowflakes at Reynolds number between 50 and 2200. We first consider case where orientation particle known a posteriori, evaluate our results against laboratory experiments using 3D-printed same shape, number. Close agreement found cases fall stably, while more...
ABSTRACT The structural evolution of snow under metamorphism is one the key challenges in modeling. main driving forces for are curvature differences and temperature gradients, inducing water vapor transport corresponding crystal growth, which detectable by motion ice/air interface. To provide quantitative means a microscopic validation models, VTK-based image analysis method developed to track interface time-lapse μ CT experiments measure local velocities both, isothermal gradient...
Abstract We compute the resistance matrices of realistic 3‐D snow particle shapes obtained from microcomputed tomography data snowpack samples and a phase field model. Using these matrices, we calculate sedimentation particles in still air Stokes regime. find that attain preferred orientations mode motion is either drifting or spiraling. Simple laws, relating average drag rotation torque coefficients to particles' sphericity, are established which lead new formulation particle's terminal...
Abstract. While optical properties of snow are predominantly determined by the specific surface area (SSA), microwave measurements often analyzed in terms exponential correlation length ξ. A statistical relation between both is commonly employed to facilitate forcing models measurements. To improve understanding ξ and establish a link grain metrics we third order term expansion function that can be regarded as shape parameter related mean Gaussian curvature. We show prediction via SSA...
Mass loss of snow packs due to recrystallization processes and subsequent vapor fluxes are inherently difficult measure experimentally. Present numerical advances enable new simulation tools explore the otherwise invisible mass diffusive convective water transport. In this study we calculate effective as a function local transfer coefficient, depth, range microstructure parameters given by porosity specific surface area. A set flow, heat transport equations re developed. Heat is...
Abstract We examine the validity of commonly used Hagen‐Poiseuille model local resistance porous media using direct numerical simulations. provide theoretical arguments that highlight possible limitations this and formulate a new constitutive is based on circularity iso‐pressure surfaces. compare performance both models three different three‐dimensional artificial media. show improves root‐mean‐squared‐relative error from , for HP to respectively. anticipate our approach may find broad...
Earth and Space Science Open Archive This work has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Local hydraulic resistance heterogeneous porous mediaAuthorsQuirineKroliDItzhakFouxoniDPascalCorsoMarkusHolznerSee all authors Quirine KroliDCorresponding Author• Submitting...