Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice

Samluk, Jesse P.; Geiger, Cathleen A.; Weiss, Chester J.; Kolodzey, James

doi:10.3189/2015AoG69A737

Title: Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice

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Abstract

In this article we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discretization of Maxwell's equations and present 2-D sliced visualizations of their associated EM fields at discrete frequencies. Several interesting observations result: First, since the simulator computes the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the complete, coupled interactions between air, snow, sea ice and sea water as a function of their conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features are violated. But the most important new finding is that changes in conductivity affect EM field response by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and magnetic fields. These effects are demonstrated through a visual feature we define as 'null lines'. Null line shape is affected by changes in conductivity near material boundaries as well as transmitter location. Our results encourage the use of null lines as a planning tool for better ground-truth field measurements near deformed icemore » types.« less

Authors:

Samluk, Jesse P. ^[1]; Geiger, Cathleen A. ^[1]; Weiss, Chester J. ^[2]; Kolodzey, James ^[1]

Univ. of Delaware, Newark, DE (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Publication Date:: Thu Oct 01 00:00:00 EDT 2015

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1235365

Report Number(s):: SAND-2015-2062J
Journal ID: ISSN 0260-3055; 569642

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Annals of Glaciology

Additional Journal Information:: Journal Volume: 56; Journal Issue: 69; Journal ID: ISSN 0260-3055

Publisher:: International Glaciological Society

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES

Citation Formats


                    Samluk, Jesse P., Geiger, Cathleen A., Weiss, Chester J., and Kolodzey, James. Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice.  United States: N. p., 2015. 
Web.  doi:10.3189/2015AoG69A737.

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                    Samluk, Jesse P., Geiger, Cathleen A., Weiss, Chester J., & Kolodzey, James. Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice.  United States.  https://doi.org/10.3189/2015AoG69A737

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                    Samluk, Jesse P., Geiger, Cathleen A., Weiss, Chester J., and Kolodzey, James. Thu .  
"Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice".  United States.  https://doi.org/10.3189/2015AoG69A737.  https://www.osti.gov/servlets/purl/1235365.

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@article{osti_1235365,

  title        = {Full-physics 3D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice},

  author       = {Samluk, Jesse P. and Geiger, Cathleen A. and Weiss, Chester J. and Kolodzey, James},

  abstractNote = {In this article we explore simulated responses of electromagnetic (EM) signals relative to in situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume discretization of Maxwell's equations and present 2-D sliced visualizations of their associated EM fields at discrete frequencies. Several interesting observations result: First, since the simulator computes the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the complete, coupled interactions between air, snow, sea ice and sea water as a function of their conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features are violated. But the most important new finding is that changes in conductivity affect EM field response by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and magnetic fields. These effects are demonstrated through a visual feature we define as 'null lines'. Null line shape is affected by changes in conductivity near material boundaries as well as transmitter location. Our results encourage the use of null lines as a planning tool for better ground-truth field measurements near deformed ice types.},

  doi          = {10.3189/2015AoG69A737},

  journal      = {Annals of Glaciology},

  number       = 69,

  volume       = 56,

  place        = {United States},

  year         = {Thu Oct 01 00:00:00 EDT 2015},

  month        = {Thu Oct 01 00:00:00 EDT 2015}

}

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