Thermo-Hydro-Mechanical-Chemical Processes in Porous Media

Kolditz, Olaf; Görke, Uwe–Jens; Shao, Hua; Wang, Wenqing

doi:10.1007/978-3-642-27177-9

Cited by 76 publications

(7 citation statements)

References 106 publications

(162 reference statements)

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“…Our axially symmetric model domain is based on the models presented in and Reid (2004) and contains a radial cross section through a cylinder (the surrounding terrain) with a radius of 18 km and a height of 3 km overlain by a cone (the edifice) with a base radius of 4.7 km and a height of 2 km ( Figure 3). The domain is discretized with unstructured tetrahedral meshes using the Gmsh and GINA utilities (Geuzaine & Remacle, 2009;Kolditz, 2012). Meshes are refined to 20-m spacing in the vicinity of layers and allowed to vary to far-field spacing of 200 m to reduce run times.…”

Section: Groundwater Flow and Heat Transport Modelingmentioning

confidence: 99%

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

et al. 2018

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Hydrothermal alteration can create low‐permeability zones, potentially resulting in elevated pore‐fluid pressures, within a volcanic edifice. Strength reduction by rock alteration and high pore‐fluid pressures have been suggested as a mechanism for edifice flank instability. Here we combine numerical models of multiphase heat transport and groundwater flow with a slope‐stability code that incorporates three‐dimensional distributions of strength and pore‐water pressure to address the following questions: (1) What permeability distributions and contrasts produce elevated pore‐fluid pressures in a stratovolcano? (2) What are the effects of these elevated pressures on flank stability? (3) Finally, what are the effects of magma intrusion on potential flank failure in an edifice? Simulation results show that under a range of plausible parameters, water tables in a stratovolcano can be elevated or perched. These elevated water tables result in universally lower stability (lower factor of safety) compared with equivalent dry edifices, indicating a higher likelihood of flank collapse. Low‐permeability (<1 × 10−17 m2) layers such as altered pyroclastic deposits or breccias can result in locally saturated regions (perched water) and lower factors of safety near the ground surface but may actually reduce liquid water saturation and pore pressures in the core of the edifice and thus may favor small, shallow collapses over larger, deeper collapses. Magma intrusion into the base of the edifice increases pore‐fluid pressures and decreases the factor of safety. However, the shear strength of edifice rocks also exerts a significant control on stability, so both mechanical properties and pore‐fluid pressures are important for stability assessments.

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Section: Groundwater Flow and Heat Transport Modelingmentioning

confidence: 99%

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

et al. 2018

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“…The gravity vector was determined according the slope of the landscape. The flow inlet boundary conditions (9) have been assigned in the locations of the inlets of three rivers at the boarders of the city Kharkiv. Convergence of the computations has been monitored by both residuals and total mass flow rate in the river system.…”

Section: Resultsmentioning

confidence: 99%

“…and agricultural pollution (fertilizers, nitrates, nitrites, etc. ), and can also cause overflow of drains and ingress of wastewaters into the surface waters, which is dangerous for the quality of both drinking and technical water [2,3,9]. Decision-making on water management is usually carried out after evaluating the values of V S , Q S , M S in comparison with the volumes of reserve possibilities of local flows.…”

Section: Methodsmentioning

confidence: 99%

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Mathematical modeling of drinking water availability in Kharkiv region (Ukraine) at different dynamics of global climate warming

Rychak

Kizilova

2022

Eureka: LS

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Water purity and availability determines health and life quality of humans, biodiversity and existence of plants and animals. The results of global climate change have been registered all over the world as progressive warming with fast heat waves, accelerated glacier ice melting, variations in the global ocean streams and heat balance, droughts and lack of drinking water, damage to plants and animals. Mathematical modeling of the water exchange in local ecosystems is a very important constituent of detailed analysis of different scenarios of water availability at various trends in the weather change. The work is aimed at mathematical modelling of water balance in an urban ecosystem accounting for global climate changes. A brief review of the models is presented, and a synthetic model for the water balance on the urban territory of Kharkiv city (Ukraine) based on the statistical dependencies, compartmental system dynamics approach and hydrological equation with probabilistic description of the input parameters is developed. The monthly and year averaged temperature and precipitation curves, time series on downpours, droughts and storms over the Kharkiv region and Kharkiv city during 1908−2012 years were collected from the open databases and analyzed. Gradual increase in the annual temperature was confirmed. Different scenarios of the regional development (population growth and industry development with increased water demands) and weather changes were tested, and availability of water has been estimated. It was established by numerical simulations, the water insufficiency in the region in 2040 could reach 10−17 % if the mean annual air temperature increases in 0.5−2.5 °T. This will cause damage for plants, animals, and human health. The obtained results are important for decision making by official planning authorities and regional administration

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“…Others, such as PHREEQC (Pankhurst, 1995;Pankhurst & Appelo, 1999) and Reaktoro (Leal, 2020), have more limited transport capabilities, focussing instead on reactions. Other initiatives, such as OpenGeoSys (Bilke et al, 2019;Kolditz et al, 2012) and PHAST (Pankhurst et al, 2010) focus on transport, and use external codes such as PHREEQC to perform the geochemical solve, while other codes such as HP2 (Šimůnek et al, 2012) couple together existing transport and reaction solvers. Steefel et al (2015) provides further code comparisons.…”

Section: Existing Softwarementioning

confidence: 99%

The MOOSE geochemistry module

Green¹,

Harbour²,

Podgorney³

2021

JOSS

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Geochemical models are used to understand the chemistry of natural waters and other aqueous solutions and their interaction with minerals in many areas of practical interest, for example, geothermal wells and reservoirs, contaminant flow through aquifers, ore creation and mining techniques, petroleum and gas exploitation, and rock diagenesis. The models are frequently extremely complicated, with thousands of interacting chemical species, and often require computer software to find the chemical concentrations.

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Thermo-Hydro-Mechanical-Chemical Processes in Porous Media

Cited by 76 publications

References 106 publications

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

Mathematical modeling of drinking water availability in Kharkiv region (Ukraine) at different dynamics of global climate warming

The MOOSE geochemistry module

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