Landon J.S. Halloran

Hi. I am a geoscientist. 🌍

More specifically, I am a hydrogeologist/geophysicist.

Among other things, I develop and apply new methods for the characterisation of groundwater systems and processes.

I am a postdoctoral researcher in the Centre d'hydrogéologie et de géothermie (CHYN) at the Université de Neuchâtel in Switzerland. In 2019, I am also working as a sessional senior lecturer (chargé d’enseignement) in the department.

PhD, UNSW, Sydney, Australia, 2016

MSc, McGill, Montréal, Canada, 2010

BSc (Hons), UVic, Victoria, Canada, 2008

This website is accessible at:

You can contact me at: landon dot halloran at unine dot ch

Landon Halloran - Research Themes and Methods Quantification of hydrogeological properties and processes. Soil moisture and the vadose zone. Surface water - groundwater exchange (SW-GW), chlorinated hydrocarbons transport and degradation in the subsurface. nitrate loss. mutiphysics. isotopes. time-series analysis. inverse modelling. geophysical methods. UAV. drones. Thermal measurements. Remote Sensing.

My publications (some with pdf link):


  • J. Zimmermann, L.J.S. Halloran, & D. Hunkeler (in revision) "Tracking Chlorinated Contaminants in the Subsurface Using Compound-Specific Chlorine Isotope Analysis: A Review of Principles, Current Challenges and Applications."
  • L.J.S. Halloran, P. Brunner, & D. Hunkeler (2019). “COMPEST, a PEST-COMSOL interface for inverse multiphysics modelling: Development and application to isotopic fractionation of groundwater contaminants.” Computers and Geosciences 126, 107-119. doi:10.1016/j.cageo.2019.02.001 pdf code


  • A. Badin, F. Braun, L.J.S. Halloran, J. Maillard, & D. Hunkeler (2018). “Modelling of C/Cl isotopic behaviour during chloroethene biotic reductive dechlorination: capabilities and limitations of simplified and comprehensive models.” PLOS One 13:8, e0202416. doi:10.1371/journal.pone.0202416 pdf
  • G.C. Rau, R.I. Acworth, L.J.S. Halloran, W.A. Timms, & M.O. Cuthbert (2018). “Quantifying compressible groundwater storage by combining cross-hole seismic surveys and head response to atmospheric tides.” Journal of Geophysical Research: Earth Surface 123, 1910–1930. doi:10.1029/2018JF004660


  • L.J.S. Halloran, M.S. Andersen & G.C. Rau (2017). “Investigation of the thermal regime and subsurface properties of a tidally-affected, variably saturated streambed,” Hydrological Processes 31:4, 2541-2555. doi:10.1002/hyp.11197 pdf
  • G.C. Rau, L.J.S. Halloran, M.O. Cuthbert, M.S. Andersen, R.I. Acworth & J. Tellam (2017). “Streambed thermal signatures characterize the dynamics of surface-groundwater interactions in ephemeral channels,” Advances in Water Resources 107, 354-369. doi:10.1016/j.advwatres.2017.07.005
  • R.I. Acworth, G.C. Rau, L.J.S. Halloran, & W.A. Timms (2017). Vertical groundwater storage properties and changes in confinement determined using hydraulic head response to atmospheric tides,” Water Resources Research 53:4, 2984-2997. doi:10.1002/2016WR020311


  • L.J.S. Halloran, G.C. Rau & M.S. Andersen (2016). “Heat as a tracer to quantify processes and properties in the vadose zone: A review,” Earth-Science Reviews 159, 358-373. doi:10.1016/j.earscirev.2016.06.009 pdf
  • R.I. Acworth, L.J.S. Halloran, G.C. Rau, M.O. Cuthbert & T. Bernardi (2016). “An objective frequency-domain method for quantifying confined aquifer compressible storage using Earth and atmospheric tides,” Geophysical Research Letters 43:22, 11671-11678. doi:10.1002/2016GL071328
  • L.J.S. Halloran, H. Roshan, G.C. Rau, and M.S. Andersen (2016). “Calculating water saturation from passive temperature measurements in near-surface sediments: Development of a semi-analytical model,” Advances in Water Resources 89, 67-79. doi:10.1016/j.advwatres.2016.01.007 pdf
  • L.J.S. Halloran, H. Roshan, G.C. Rau, M.S. Andersen, and R.I. Acworth (2016). “Improved spatial delineation of streambed properties and water fluxes using distributed temperature sensing,” Hydrological Processes 30, 2686-2702. doi:10.1002/hyp.10806 pdf


  • G.C. Rau, M.O. Cuthbert, A.M. McCallum, L.J.S. Halloran, and M.S. Andersen (2015). “Assessing the accuracy of 1-D analytical heat tracing for estimating near-surface sediment thermal diffusivity and water flux under transient conditions,” Journal of Geophysical Research: Earth Surface 120:8, 1551–1573. doi:10.1002/2015JF003466


  • P.C. Hines, J.C. Osler, J.G.E. Scrutton, and L.J.S. Halloran (2010). “Time-of-Flight Measurements of Acoustic Wave Speed in a Sandy Sediment at 0.6–20 kHz,” IEEE Journal of Oceanic Engineering 35:3, 502-515. doi:10.1109/JOE.2010.2054291
  • L.J.S. Halloran, S. Fostner, E. Paradis, and J.A. Behr (2009). “Specific mass shift of potassium 5P1/2 state,” Optics Communications 282:4, 554–557. doi:10.1016/j.optcom.2008.10.045
  • D. Duchesne, L. Razzari, L. Halloran, R. Morandotti, A. J. Spring Thorpe, D. N. Christodoulides, and D. J. Moss (2009). “Two-photon photodetector in a multiquantum well GaAs laser structure at 1.55ÎĽm,” Optics Express 17, 5298-5310. doi:10.1364/OE.17.005298