scholarly journals Investigation of Climate Change on Unsaturated Porous Media via a Discrete Thermo-Hydro-Mechanical Model

2021 ◽  
Vol 11 (16) ◽  
pp. 7617
Author(s):  
Alireza Mokhtari Varnosfaderani ◽  
Ehsan Motevali Haghighi ◽  
Behrouz Gatmiri ◽  
Seonhong Na
Keyword(s):  
Climate Change ◽  
Porous Media ◽  
Crack Propagation ◽  
Thermal Action ◽  
Mechanical Analysis ◽  
Masonry Wall ◽  
Degree Of Saturation ◽  
Unsaturated Porous Media ◽  
Discrete Fracture Model ◽  
Proposed Model

The impacts of climate change on unsaturated porous media have been investigated through the coupled thermo-hydro-mechanical analysis by leveraging a discrete fracture model. The transport of gas and liquid phases in unsaturated porous media is captured under non-isothermal conditions. The balance principles of moisture energy and mass are associated with crack propagation. The temperature-dependent degree of saturation and permeability of water are incorporated into fracture based on the cubic law. Numerical examples are designed to evaluate the applicability of the proposed model against climate change. First, a double-notch plate domain is used to identify the sensitivity of various material properties on crack propagation associated with mechanical loading. Then, a masonry wall of drying under thermal action is studied to investigate its degradation by mimicking climatic load conditions. The results of numerical tests demonstrate the capabilities of the proposed model for practical application well.

scholarly journals Macroscopic lattice Boltzmann model for heat and moisture transfer process with phase transformation in unsaturated porous media during freezing process

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 379-393 ◽  
Author(s):  
Wenyu Song ◽  
Yaning Zhang ◽  
Bingxi Li ◽  
Fei Xu ◽  
Zhongbin Fu
Keyword(s):  
Porous Media ◽  
Transfer Process ◽  
Lattice Boltzmann ◽  
Lattice Boltzmann Model ◽  
Experimental Result ◽  
Freezing Process ◽  
Unsaturated Porous Media ◽  
Proposed Model ◽  
Heat And Moisture ◽  
Boltzmann Model

AbstractIn the current study, a macroscopic lattice Boltzmann model for simulating the heat and moisture transport phenomenon in unsaturated porous media during the freezing process was proposed. The proposed model adopted percolation threshold to reproduce the extra resistance in frozen fringe during the freezing process. The freezing process in Kanagawa sandy loam soil was demonstrated by the proposed model. The numerical result showed good agreement with the experimental result. The proposed model also offered higher computational efficiency and better agreement with the experimental result than the existing numerical models. Lattice Boltzmann method is suitable for simulating complex heat and mass transfer process in porous media at macroscopic scale under proper dimensionless criterion, which makes it a potentially powerful tool for engineering application.

Advancements in multi‐phase unsaturated porous media fracture

PAMM ◽  
2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Yousef Heider ◽  
WaiChing Sun ◽  
Bernd Markert
Keyword(s):  
Porous Media ◽  
Unsaturated Porous Media ◽  
Multi Phase

scholarly journals Assessing the Response of Snow Avalanche Runout Altitudes to Climate Fluctuations Using Hierarchical Modeling: Application to 61 Winters of Data in France

2010 ◽  
Vol 23 (12) ◽  
pp. 3157-3180 ◽  
Author(s):  
N. Eckert ◽  
H. Baya ◽  
M. Deschatres
Keyword(s):  
Climate Change ◽  
Large Scale ◽  
Hierarchical Modeling ◽  
Control Measures ◽  
Level Shift ◽  
Snow Avalanches ◽  
Winter Climate ◽  
Climate Fluctuations ◽  
High Magnitude ◽  
Proposed Model

Abstract Snow avalanches are natural hazards strongly controlled by the mountain winter climate, but their recent response to climate change has thus far been poorly documented. In this paper, hierarchical modeling is used to obtain robust indexes of the annual fluctuations of runout altitudes. The proposed model includes a possible level shift, and distinguishes common large-scale signals in both mean- and high-magnitude events from the interannual variability. Application to the data available in France over the last 61 winters shows that the mean runout altitude is not different now than it was 60 yr ago, but that snow avalanches have been retreating since 1977. This trend is of particular note for high-magnitude events, which have seen their probability rates halved, a crucial result in terms of hazard assessment. Avalanche control measures, observation errors, and model limitations are insufficient explanations for these trends. On the other hand, strong similarities in the pattern of behavior of the proposed runout indexes and several climate datasets are shown, as well as a consistent evolution of the preferred flow regime. The proposed runout indexes may therefore be usable as indicators of climate change at high altitudes.

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