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News and Media

Who are we?

Welcome to the website of the HydroGeophysics Group (HGG). HGG is a large and highly skilled research group at the Department of Geoscience, Aarhus University, Denmark, working primarily with hydrogeophysics. The research covers many aspects of hydrogeophysics: instrument development, data collection, processing and inversion algorithms, software development, as well as integration of the geophysics results into geological and hydrological models.

Contact the HydroGeophysics Group: hgg@geo.au.dk

Automated Transient Electromagnetic Data Processing for Ground-Based and Airborne Systems by a Deep Learning Expert System,
Asif, M. R., P. K. Maurya, N. Foged, J. J. Larsen, E. Auken, and A. V. Christiansen.IEEE Transactions on Geoscience and Remote Sensing, 60, 1-14, 2022.

A neural network-based hybrid framework for least-squares inversion of transient electromagnetic data,
Asif, M. R., T. S. Bording, P. K. Maurya, B. Zhang, G. Fiandaca, D. J. Grombacher, A. V. Christiansen, E. Auken, and J. J. Larsen.IEEE Transactions on Geoscience and Remote Sensing, 60, 1-10, 2022.

Integrating neural networks in least-squares inversion of airborne time-domain electromagnetic data,
Asif, M. R., N. Foged, P. K. Maurya, D. J. Grombacher, A. V. Christiansen, E. Auken, and J. J. Larsen.Geophysics, 87, 4, E177–E187, 2022.

Resolution attributes for AEM inversion models. A conceptual analysis and novel measures.,
Christensen, N. B.Near Surface Geophysics, 20, 12, 2022.

Joint inversion of airborne TEM data and surface galvanic data. The Egebjerg case.,
Christensen, N. B.Journal of Applied Geophysics, 196, 3, 10, 2022.

Accelerated 2.5-D inversion of airborne transient electromagnetic data using reduced 3-D meshing ,
Engebretsen, K. W., B. Zhang, G. Fiandaca, L. M. Madsen, E. Auken, and A. V. Christiansen.Geophysical Journal International 230, 1, 643-653, 2022.

Non-destructive 3D prospection at the Viking Age fortress Borgring, Denmark ,
Kristiansen, S. M., D. Stott, A. V. Christiansen, P. S. Henriksen, C. Jessen, M. F. Mortensen, J. B. Pedersen, S. M. Sindbæk, and J. Ulriksen.Journal of Archaeological Science: Reports, 42, 2022.

Quantifying Reagent Spreading by Cross-Borehole Electrical Tomography to Assess Performance of Groundwater Remediation,
Lévy, L., R. Thalund-Hansen, T. S. Bording, G. Fiandaca, A. V. Christiansen, K. Rügge, N. Tuxen, M. Hag, and P. L. Bjerg.Water Resources Research, 58, 23, 2022.

Comparison of ground-based and airborne transient electromagnetic methods for mapping glacial and permafrost environments: Cases from McMurdo Dry Valleys, Antarctica,
Madsen, L. M., T. S. Bording, D. Grombacher, N. Foged, N. Foley, H. A. Dugan, P. T. Doran, J. f. Mikucki, S. Tulaczyk, and E. Auken.Cold Regions Science and Technology, 199, 2022.

Efficient imaging of hydrological units below lakes and fjords with a floating, transient electromagnetic (FloaTEM) system,
Maurya, P. K., F. E. Christensen, M. A. Kass, J. B. Pedersen, R. R. Frederiksen, N. Foged, A. V. Christiansen, and E. Auken.Hydrology and Earth System Sciences, 26, 11, 2813-2827, 2022.

Technical note: Efficient imaging of hydrological units below lakes and fjords with a floating, transient electromagnetic (FloaTEM) system,
Maurya, P. K., F. E. Christensen, M. A. Kass, J. B. Pedersen, R. R. Frederiksen, N. Foged, A. V. Christiansen, and E. Auken.Hydrology and Earth System Sciences, 26, 11, 2813-2827, 2022.

Automatic stochastic 3D clay fraction model from tTEM survey and borehole data,
Neven, A., A. V. Christiansen, and P. Renard.Nature/Scientific Reports, 12:17112, 15, 2022.

Three-dimensional time lapse inversion of transient electromagnetic data, with application at an Icelandic geothermal site,
Xiao, L., G. Fiandaca, P. K. Maurya, A. V. Christiansen, and L. Lévy.Geophysical Journal International, 231, 1, 584–596, 2022.

Fast 2.5 D and 3D inversion of transient electromagnetic surveys using the octree-based finite-element method,
Xiao, L., G. Fiandaca, B. Zhang, E. Auken, and A. V. Christiansen.Geophysics, 87, 4, E267-E277, 2022.

Machine learning based fast forward modelling of ground-based time-domain electromagnetic data,
Bording, T. S., M. R. Asif, A. S. Barfod, J. J. Larsen, B. Zhang, D. J. Grombacher, A. V. Christiansen, K. W. Engebretsen, J. B. Pedersen, P. K. Maurya, and E. Auken.Journal of Applied Geophysics, 2021, 187, 9, 2021.

Cross-borehole geoelectrical time-lapse monitoring of in situ chemical  oxidation and permeability estimation through induced polarization,
Bording, T., A. K. Kühl, G. Fiandaca, J. F. Christensen, A. V. Christiansen, and E. Auken.Near Surface Geophysics, 2021, 19, 43-58, 2021.

Using geophysical survey results in the inference of aquifer vulnerability measures,
Christensen, N. B., and A. V. Christiansen.Near Surface Geophysics, 2021, 19, 15, 2021.

Rapid Mapping of Hydrological Systems in Tanzania Using a Towed Transient Electromagnetic System,
Grombacher, D., P. K. Maurya, J. C. Lind, J. Lane, and E. Auken.Groundwater, 12, 2021.

Assessment of complex subsurface redox structures for sustainable development of agriculture and the environment,
Hansen, B. G., D. D. Voutchkova, P. B. E. Sandersen, A. Kallesøe, L. Thorling, I. Møller, R. B. Madsen, R. Jakobsen, J. Aamand, P. K. Maurya, and H. Kim.Environmental Research Letters, 2021, 16, 14, 2021.

A towed magnetic gradiometer array for rapid, detailed imaging of utility, geological, and archaeological targets,
Kass, M. A., E. Auken, J. J. Larsen, and A. V. Christiansen.Geoscientific Instrumentation, Methods and Data Systems, 10, 2, 313-323, 2021.

A 3D hydrogeochemistry model of nitrate transport and fate in a glacial sediment catchment: A first step toward a numerical model,
Kim, H., P. B. E. Sandersen, R. Jakobsen, A. J. Kallesøe, N. Claes, G. Blicher-Mathiesen, N. Foged, J. Aamand, and B. Hansen.Science of The Total Environment, 776, 146041, 2021.

Suppression of very low frequency radio noise in transient electromagnetic data with semi-tapered gates,
Larsen, J. J., S. S. Pedersen, N. Foged, and E. Auken.Geoscientific Instrumentation Methods and Data Systems, 2021, 10, 81-90, 2021.

3D Multiple-Point Geostatistical Simulation of Joint Subsurface Redox and Geological Architectures.,
Madsen, R. B., H. Kim, A. J. Kallesøe, P. B. E. Sandersen, T. N. Vilhelmsen, T. M. Hansen, A. V. Christiansen, I. Møller, and B. Hansen.Hydrology and Earth System Sciences, 25, 5, 2759–2787, 2021.

Thermal legacy of a large paleolake in Taylor Valley, East Antarctica, as evidenced by an airborne electromagnetic survey,
Myers, K. F., P. T. Doran, S. M. Tulaczyk, N. T. Foley, T. S. Bording, E. Auken, H. A. Dugan, J. A. Mikucki, N. Foged, D. Grombacher, and R. A. Virginia.Cryosphere, 15, 3577-3593, 2021.

tTEM20AAR: A benchmark geophysical data set for unconsolidated fluvioglacial sediments,
Neven, A., P. K. Maurya, A. V. Christiansen, and P. Renard.Earth System Science Data, 13, 6, 2743-2752, 2021.

Utilizing the towed Transient ElectroMagnetic method (tTEM) for achieving unprecedented near-surface detail in geological mapping,
Sandersen, P. B. E., A. J. Kallesøe, I. Møller, A.-S. Høyer, F. Jørgensen, J. B. Pedersen, and A. V. Christiansen.Engineering Geology, 288, 11, 2021.

Sampling density and spatial analysis: a methodological pXRF study of the geochemistry of a Viking-Age house in Ribe, Denmark,
Trant, P. L. K., S. M. Kristiansen, A. V. Christiansen, B. Wouters, and S. M. Sindbæk.Archaeological and Anthropological Sciences, 13, 21, 17, 2021.

Software

AarhusInv  -  high performance modeling and inversion code supporting a variety of geophysical data types

Aarhus Workbench - Processing and inversion software for AEM, ERT,  IP,  GCM

News from HGG

HGG mapping groundwater in Yellowstone National Park.

A new study providing an unprecedented regional view of the earth’s crust beneath Yellowstone National Park will begin with a helicopter electromagnetic and magnetic (HEM) survey on November 7, 2016. A new study providing an unprecedented regional view of the earth’s crust beneath Yellowstone National Park will begin with a helicopter electromagnetic and magnetic (HEM) survey on November 7, 2016.

Read the article here.


HGG is proud to have hosted the 4TH INTERNATIONAL WORKSHOP ON INDUCED POLARIZATION from 6-8 June 2016.

Thanks to all who participated in the 4th International Workshop on Induced Polarization in Aarhus!

Read more here

 


 

The HydroGeophysics Group is proud to have hosted the

- read more


News & Media

tTEM in action in Germany

Watch the video, tTEM mit mehr Pepp, here (German text, no subtitles).

tTEM and FloaTEM on national TV

On Wednesday May 12, DRTV (the Danish national TV channel) reported from Himmark where the HGG is currenty mapping pollution with tTEM and FloaTEM. Watch it here. The item is the last one, and it starts 21 minutes and 14 seconds into the broadcast.



Managing groundwater in a shifting climate: The TOPSOIL project

Through several years, the Interreg project TOPSOIL has been an important part of HGG's work and research. Much of tTEM and FloaTEM has been developed and tested in this project. Now you can read an article about the project in the RSA Region Studies Association ezine - so hop in and read more right here - besides the story there are many great photos of our equipment in action.


Antarctica - ever fascinating!

Over the years we have presented scientific results from Antarctica at conferences and in papers. Now you can join us and see Antarctica for yourselves. We were lucky to meet a team from PBS when we did the SkyTEM survey in 2018 and PBs have made an entire series about the research at McMurdoc. The airborne EM is in episode 2.

Watch the video here

You can read more about the Antarctica project here.


New article about the outcomes of the projects rOpen and Mapfield - how new geophysical technology clears the way towards a clean water environment - Read the article here (in Danish)


Go watch this video showing success with finding engine parts below the ice in Greenland with the new geophysical instrument SnowTEM!

­


YouTube videos of the presentations from the SEG workshop in June 2019

You will find Esben Auken's and Anders Vest Christiansen's presentations as no. 3 and 4.


The forked twig of the future: New method for detecting water. Read the article, Water dowsing with science, on the Poul Due Jensen Foundations website.


The Antarctic Sun: News about Antarctica - The Dry Valleys’ Briny Deep - read the article here.


Ny teknologi skal gøre det muligt at bestemme hvordan undergrunden under den enkelte mark naturligt omsætter kvælstof. Det vil bane vejen for målrettet regulering af kvælstofgødskning, til gavn for både miljø og landbrug. Læs mere her: http://scitech.au.dk/om-science-and-technology/aktuelt/nyheder/vis/artikel/hvor-god-er-din-mark-til-at-holde-paa-kvaelstoffet/


In cooperation with the USGS, HGG is actively involved in organizing the AGU-SEG workshop on airborne magnetics in Florida, June 2019. More information can be found here: https://connect.agu.org/2019aguseg/home


HGG overtager forsiden på ­Politiken den 19, juli 2018

 


Omtale på dr.dk 

Ny metode til rensning af forurenet klitplantage kan give besparelse på 10 mio. kr.

Læs pdf her.


 

Article in Videnskab.dk:

Gennembrud i dansk grundvandsforskning - read the article here (in Danish only) and watch the video here.

Dansk forskning er helt i front, når det gælder kortlægning af grundvandet. I alt er lidt mere end 40 procent af det danske land netop kortlagt med henblik på grundvandet.


­­HGG in Yellowstone has gone viral...

All the major networks and newspapers in the US are featuring the story about groundwater mapping in Yellowstone.

See the list here.


 

GEOCON projektet giver bølger i grundvandet på Samsø

Planen om, at man afløser de konstant kørende afværgeforanstaltninger ved Pillemark Losseplads på Samsø med monitering og mulighed for at skride ind, hvis det bliver nødvendigt, vækker bekymring for grundvandskvaliteten på Samsø. Der planlægges et borgermøde, hvor samsingerne skal diskutere og tage stilling til projektets planer.


NEW on YouTube - latest from the TRUST project

Watch it here on YouTube.


NEW NSF VIDEO: Discovery made beneath Antarctica's McMurdo Dry Valleys

Using a novel, helicopter-borne sensor to penetrate the surface of large swathes of terrain, a team of researchers supported by the National Science Foundation (NSF) has gathered compelling evidence that beneath Antarctica's ice-free McMurdo Dry Valleys lies a salty aquifer that may support previously unknown microbial ecosystems and retain evidence of ancient climate change.

Watch the US National Science Foundation video here on YouTube!


Article about the Antarctica Project in Nature Communications

Read the article here.

The article has generated widespread media attention - see below:


Danish Technology detects new knowledge about the Antarctic underground.

Danish Radio has interviewed Professor Esben Auken from the Hydrogeophysics Group about the results of the Antarctica project. Read the inverview here (in Danish) and watch the video!


Jill Mikucki’s Antarctica study in the news

Jill Mikucki, a microbiology assistant professor, was part of a team that detected extensive salty groundwater networks in Antarctica using a novel airborne electromagnetic mapping sensor system called SkyTEM. The hidden interconnected lakes could sustain life and shed light on ancient climate change. They also may provide the basis for future exploration of a subsurface habitat on Mars.

The Washington Post featured Mikucki and the study in this article.

Numerous national and international media outlets also featured the research, including the ABC Science, Christian Science Monitor, Huffington Post, Discovery, Daily Mail, the Verge, New Scientist, Business Insider Australia, Business Standard, Yahoo! News, International Business Times, Irish Examiner, Science Mag, Phys.org, Silicon Republic, and Knoxville News Sentinel.


Discovered deep under Antarctic surface: Extensive, salty aquifer and potentially vast microbial habitat

Helicopter-borne instrument shows what lies beneath Antarctica's ice-free Dry Valleys. Using a novel, helicopter-borne sensor to penetrate the surface of large swathes of terrain, a team of researchers supported by the National Science Foundation (NSF) has gathered compelling evidence that beneath Antarctica's ice-free McMurdo Dry Valleys lies a salty aquifer that may support previously unknown microbial ecosystems and retain evidence of ancient climate change. Read more here.


 Visitors from China Geological Survey

  

In early December 4 scientists from the airborne division of the China Geological Survey visited Aarhus University, GEUS and SkyTEM Surveys to discuss groundwater resource mapping in China using Danish technology.


See more from NEWS & MEDIA here.