Halloran, Landon

Postdoctoral Researcher


PhD, University of New South Wales, 2016

MSc, McGill University, 2010

BSc (Hons), University of Victoria, 2008



As a hydrogeologist/geophysicist, I aim to improve our understanding of groundwater processes and subsurface properties.  My current research focuses on two themes: contaminants at the aquifer/aquitard interface and novel hydro-geophysical methods.

I develop models that integrate isotopic effects related to degradation and diffusion processes of chlorinated hydrocarbons. This work explores the capabilities of compound specific isotopic analysis (CSIA) in evaluating: a) localised degradation in the aquitard and/or aquifer, b) biotic and abiotic degradation processes, and c) dynamics of a contaminant system prior to measurement.

I also advance and apply physical methods for the characterisation of groundwater systems. Much of this work involves signal-processing techniques that use natural periodic variations of both temperature and tidal forces. By exploiting these natural fluctuations, we can measure soil moisture and groundwater-surface water exchange, as well as aquifer confinement and subsurface elastic properties.


PUBLICATIONS (see www.ljsh.ca for an up-to-date list):


  • 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,” 107, 354-369. Advances in Water Resources. doi:10.1016/j.advwatres.2017.07.00
  • 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.” 31:4, 2541-2555. Hydrological Processes. doi:10.1002/hyp.11197
  • 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,” 53:4, 2984-2997. Water Resources Research. doi:10.1002/2016WR020311



  • 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,” 43:22, 11671-11678. Geophysical Research Letters. doi:10.1002/2016GL071328
  • 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
  • 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




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