Landon J.S. Halloran

Hi. I am a geoscientist. 🌍

More specifically, I am a hydrogeologist/geophysicist.

My research interests include environmental geophysics, contaminant transport modelling, alpine hydrogeology, and surface water-groundwater interactions.

I am currently a postdoctoral researcher in the Centre d'hydrogéologie et de géothermie (CHYN) at the Université de Neuchâtel in Switzerland.

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

My publications (some with link to pdf 📄 and/or code 💻):


  • L.J.S. Halloran & D. Hunkeler (2020) "Controls on the persistence of aqueous-phase groundwater contaminants in the presence of reactive back-diffusion." Science of the Total Environment 722 , 137749. doi:10.1016/j.scitotenv.2020.137749 📄 💻
  • J. Zimmermann, L.J.S. Halloran, & D. Hunkeler (2020) "Tracking Chlorinated Contaminants in the Subsurface Using Compound-Specific Chlorine Isotope Analysis: A Review of Principles, Current Challenges and Applications." Chemosphere 244, 125476. doi:10.1016/j.chemosphere.2019.125476 📄


  • 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 📄 💻


  • 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 📄
  • 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 📄
  • 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 📄
  • 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 📄
  • 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 📄


  • 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 1.55μm,” Optics Express 17, 5298-5310. doi:10.1364/OE.17.005298
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.