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Groundwater Modeling as an Assessment Tool for Underground Mines Located in Fractured Massifs

Some of the present metallic ores mines are located in areas formed by a heterogeneous fractured massif where groundwater flows preferentially through fractures. Underground mining in these zones can cause impacts in streams, lakes and change the natural water balance of the watersheds, leading to conflicts between traditional uses of water and the mining activity. Quantification of these impacts is crucial for the ...
www.ch.comsol.com/paper/15482

CO2 Storage Trapping Mechanisms Quantification

The capture and storage of CO2 in deep geological formations is one of the proposed solutions to reduce CO2 emissions to the atmosphere. CO2 is injected as a supercritical fluid deep below a confining geological formation that prevents its return to the atmosphere. In general, four trapping mechanisms are expected, which are of increasing importance through time: (1) structural, (2) residual saturation, (3) dissoluti ...
www.ch.comsol.com/paper/15442

An Innovative Reactive Transport Modeling Approach for the Chemical Evolution of a HLW Cell in the Callovo-Oxfordian Formation

Andra (The French National Radioactive Waste Management Agency) envisages the safe disposal of High-Level Waste (HLW) and Intermediate-Level Long-Lived Waste (IL-LLW) in deep geological storage using a multi-barrier system. To ensure the containment of radioactivity, the principle of storage is based on a clay formation with low permeability, homogeneity and continuity (i.e Callovo-Oxfordian (CallOX) formation), prop ...
www.ch.comsol.com/paper/15438

Groundwater Flow and Solute Transport Modeling in the SFR Nuclear Waste Repository

The Swedish Nuclear Fuel and Waste Management Company (SKB) operates the underground repository for low- and intermediate-level nuclear waste (SFR) located in Försmark, Sweden. An extension of the SFR is planned to accommodate mainly waste arising from the decommissioning of Swedish nuclear power plants. The long-term safety assessment for the SFR repository takes into account the future hydrogeological conditions i ...
www.ch.comsol.com/paper/15491

Why We Have Earthquakes in the Eastern United States

There are only two types of naturally-occurring earthquakes anywhere on the Earth: 1) those associated with the dynamics of plate tectonics and 2) those associated with the dynamics of the hydrologic cycle. The first type is characteristic of an INTERplate setting (like the San Andreas Fault). The second (“hydroseismicity”) is characteristic of an INTRAplate setting (like the Virginia magnitude 5.7 earthquake of ...
www.ch.comsol.com/paper/14741

Numerical Analysis of Shaft Resistance and Toe Resistance of a Pile in Unsaturated Soil

A pile transfers structural load to the ground at the surface of its shaft and at its toe. In the calculation of these two components of load, both the deformation characteristics and the strength properties of the soil are needed. In unsaturated soils, matric suction changes the stress-strain-strength behavior of the soil. Similarly, the adhesion and the friction angle at the contact area between the soil and the pi ...
www.ch.comsol.com/paper/15139

Coupled Palaehydrogeological Microbial and Geochemical Reactive Transport Model of the Olkiluoto Site (Finland)

Olkiluoto at Eurajoki has been selected as the final repository site for spent nuclear waste in Finland. This area has been affected, at regional scale, by land-uplift processes related to the ice withdrawal. These events have resulted in a complex and stratified heterogeneous hydrochemical system. The objective of this work was to develop a robust paleohydrogeological reactive transport (PRT) model that, through a b ...
www.ch.comsol.com/paper/15436

Investigating the Impacts of Hydrogeological Parameters on DSI Efficiency through Numerical Simulation

Düsensauginfiltration (DSI),‘nozzle-suction-infiltration’, is a new method for dewatering that avoids groundwater abstraction from the aquifer. Drawdown is achieved via pumping of groundwater at upper abstraction section, meanwhile, all the pumped water is injected through the same borehole, but in greater depth. We use COMSOL Multiphysics® for the development of a 2D model that simulates groundwater fl ...
www.ch.comsol.com/paper/15415

Numerical Model for Leaching and Transporting Behavior of Radiocesium in MSW Landfill

This paper presents the numerical simulation model for radiocesium leaching and transporting behavior in municipal solid waste (MSW) landfill and discusses on the design for the required geometry and properties of the impermeable final cover and the soil sorption layer, which work for containment of hazardous waste such as radiocesium-contaminated MSW generated by Fukushima Daiichi nuclear disaster. The leaching beh ...
www.ch.comsol.com/paper/16012

Using COMSOL for geophysics applications

Dr. McKenna is a Research Geophysicist at the U.S. Army Engineer Research and Development Center (ERDC). She directs the Denied Area Monitoring and Exploitation Systems working group at ERDC, which has ongoing integrated high performance computing modeling and experimental research with the Department of Defense, Department of Energy, Defense Intelligence Agency, Los Alamos National Laboratory and academic institutio ...
www.ch.comsol.com/paper/9492

Coupling Hydrodynamics and Geophysics with COMSOL Multiphysics: First Approach and Application to Leachate Injection in Municipal Waste Landfills

The efficiency of bioreactor lanfills depends on a homogeneous distribution of leachate in the waste body. Therefore, optimisation of leachate injection systems is a challenging issue for operators. Most studies have shown that surface Electrical Resistivity Tomography (ERT) can be a suitable method to study moisture distribution (2D and 3D). But resistivity inversion models used to date are based on limitating hypot ...
www.ch.comsol.com/paper/10942

Analog and FEM Models of Lava Dome Dynamics

Extrusion of highly viscous lavas that spread laterally and form lava domes in craters of large volcanoes is associated with significant volcanic hazards. Gas overpressure driven fragmentation of the lava dome or collapse and slumping of marginal sections or entire mass of the dome can trigger dangerous pyroclastic flows that threaten surrounding populations up to tens of kilometers away. We examine the non-linear ...
www.ch.comsol.com/paper/11626

Investigation on Numerical Modeling Aspects of Hydraulic Fracturing

During hydraulic fracturing processes, several coupled mechanical and hydraulical phenomena take place. We investigate an elastically deformable fluid-filled fracture embedded in a porous rock matrix. Despite the substantial number of previous modeling approaches, a clear insight into the numerical solution procedure of high pressure fluid injection in a fracture has not been gained. We use COMSOL for different f ...
www.ch.comsol.com/paper/11326

Eccentricity of Normal Electric Borehole Sondes with Finite Geometry

Numerical calculations have been carried out to quantify the effect of the eccentric position of normal electric borehole sondes on the current density distribution and the obtained specific resistivity. In the most calculations the distorting influence of the eccentricity (distance between the axis of the borehole and the sonde) on the specific resistivity is less than 2%, but in special cases (low resistivity claye ...
www.ch.comsol.com/paper/11026

3D Finite Element Models of Ground Deformation and Stress Field in a Viscoelastic Medium

A 3D finite element model was used to evaluate the time dependent ground deformation and the stress change caused by a pressure source embedded in a viscoelastic medium. In volcanic areas, the presence of inhomo-geneous materials and high temperatures produce a lower effective viscosity of the Earth's crust which calls for consideration of the thermal regime of crustal volume surrounding the magmatic source ...
www.ch.comsol.com/paper/2613

Modeling and 2-D FE-simulation of Vortex Ripples Using a Three-phase Mixture Approach

A new continuum-mechanical model for the study of sediment erosion, transport and deposition was developed using a three-phase mixture approach. It differs from existing two-phase models in that the sediment is modeled as two different phases, rigid sediment bed and mobile particles, instead of one phase. The model is currently implemented into Comsol Multiphysics using the Mixture Model and PDE interfaces. Numeri ...
www.ch.comsol.com/paper/11668

Analysis of 1D, 2D, and 3D Marine CSEM in COMSOL Multiphysics® Software

The Marine Controlled Source ElectroMagnetic (marine CSEM) is a geophysical method used by the oil industry to investigate resistive targets in the sediments under the ocean floor. In this work we simulate marine CSEM data including 1D, 2.5D and 3D modeling. The results obtained with COMSOL Multiphysics show themselves as a promising tool for the studies of electromagnetic methods in prospecting of hydrocarbons, prov ...
www.ch.comsol.com/paper/19795

COMSOL Multiphysics® Software: Time-Lapse Electrical Resistivity Inversion

Time-lapse electrical resistivity tomography (ERT) method provides a non-invasive way to monitor subtle sub-surface changes caused by water flow such as in an infiltration test. Problems arise when the inversion models contain artifacts due to measurement errors, rapid change in soil electrical property during measurement time, etc. A new approach was developed by Kim et al. (2004) and (2009) that incorporates the ti ...
www.ch.comsol.com/paper/18769

Absorbing Boundary Domain for CSEM 3D Modeling

In the study, we present an efficient absorbing boundary domain technique whose main application is the 3D finite element (FE) modelling of the so-called controlled-source electromagnetic (CSEM) data, collected for the geophysical exploration. The developed technique is based on the real-value exponentially-stretched coordinates. We have implemented the developed technique using the user-defined PML tool available ...
www.ch.comsol.com/paper/8671

Transport in reactive porous media containing biofilms

The objective of this presentation is the evaluation of effective bulk transport properties of reactive porous biofilm. We present our microscale model that accounts for both momentum and mass balances. ...
www.ch.comsol.com/paper/2841

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