Dr John Knight

Research Fellow, Department of Environmental Sciences

C81 - ATP - The Biomedical Building
The University of Sydney

Telephone +61 2 8627 1182
Fax +61 2 8627 1099

Biographical details

Dr John Knight is a Research Fellow in the Department of Environmental Sciences. He is an applied Mathematician with a Ph.D. in mathematics from the Australian National University, and he worked with the late John Philip and others at the CSIRO Centre for Environmental Mechanics and its successors. Most of his research has been modelling heat and mass transfer in the natural environment, in particular the flow of water, gas, solutes and heat in soils and other porous media. He uses finite difference numerical methods or analytical methods such as Laplace transforms as appropriate. He is an author of key publications on the sizes and shapes of the measurement volumes of instruments that use time domain reflectometry or heat pulse methods to measure soil water content.

Research interests

Dr Knight's main project is to model the release of nitrous oxide from pastures and fields of crops. After rainwater fills pores in the surface of the soil, bacteria use up all of the oxygen and then emit nitrous oxide, which escapes into the atmosphere as the water drains or evaporates. The nitrous oxide ultimately becomes a greenhouse gas. The output from the model will be compared to the measurements of nitrous oxide concentrations in the air above the soil.

http://scholar.google.com.au/citations?user=vIPVg1UAAAAJ&hl=en&oi=a

Themes

Agronomy, horticulture and precision agriculture; Climate Change

Selected publications

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Journals

  • Knight, J., Davis, G. (2013). A conservative vapour intrusion screening model of oxygen-limited hydrocarbon vapour biodegradation accounting for building footprint size. Journal of Contaminant Hydrology, 155, 46-54. [More Information]
  • Cook, F., Knight, J., Doble, R., Raine, S. (2013). An improved solution for the infiltration advance problem in irrigation hydraulics. Irrigation Science, 31(5), 1113-1123.
  • Cook, F., Knight, J., Kelliher, F. (2013). Modelling oxygen transport in soil with plant root and microbial oxygen consumption: Depth of oxygen penetration. Soil Research, 51(6), 539-553. [More Information]
  • Cook, F., Knight, J., Silburn, D., Kookana, R., Thorburn, P. (2013). Upscaling from paddocks to catchments of pesticide mass and concentration in runoff. Agriculture, Ecosystems and Environment, 180, 136-147. [More Information]
  • Knight, J., Kluitenberg, G., Kamai, T., Hopmans, J. (2012). Semianalytical solution for dual-probe heat- pulse applications that accounts for probe radius and heat capacity. Vadose Zone Journal, 11(2). [More Information]
  • Cook, F., Knight, J., Wooding, R. (2009). Steady groundwater flow to drains on a sloping bed: Comparison of solutions based on Boussinesq equation and Richards equation. Transport in Porous Media, 77(2), 357-372. [More Information]
  • Warrick, A., Hinnell, A., Ferré, T., Knight, J. (2008). Steady state lateral water flow through unsaturated soil layers. Water Resources Research, 44(8). [More Information]

Conferences

  • Knight, J., Kluitenberg, G. (2013). Correcting for finite probe diameter in the dual probe heat pulse method of measuring soil water content. 20th International Congress on Modelling and Simulation (MODSIM2013), Adelaide, Australia: Modelling and Simulation Society of Australia and New Zealand Inc (MSSANZ).
  • Knight, J., Cook, F., Doble, R., Raine, S. (2011). An Improved Solution for the Infiltration-Advance Problem In Irrigation Hydraulics. Soil Science of America Annual Meeting.
  • Knight, J., Cook, F. (2010). Analytical solution for drainage from a uniformly wetted deep soil profile. 19th World Congress of Soil Science Soil solutions for a changing world, Australia: International Union of Soil Sciences (IUSS).
  • Knight, J. (2010). Local hot spots in oxidising bagasse stockpiles. ANZIAM Conference 2010.
  • Rassam, D., Pickett, T., Knight, J. (2009). Incorporating floodplain groundwater interactions in river modelling. The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation, Australia: Modelling/Simulation Society of Aus and NZ & International Assoc for Math and Comp in Simulation.
  • Cook, F., Knight, J., Humphreys, E., McHugh, A., Tisdall, J., Hamilton, G., Roth, C. (2009). Modelling of water and solutes in permanent raised beds. The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation, Australia: Modelling/Simulation Society of Aus and NZ & International Assoc for Math and Comp in Simulation.
  • Knight, J. (2009). Speed enhancement for a growth-diffusion wave travelling along an interface between two media. ANZIAM Conference.
  • Knight, J. (2008). Speed enhancement for a growth-diffusion wave travelling along an interface between two media. Queensland ANZIAM Conference.

2013

  • Knight, J., Davis, G. (2013). A conservative vapour intrusion screening model of oxygen-limited hydrocarbon vapour biodegradation accounting for building footprint size. Journal of Contaminant Hydrology, 155, 46-54. [More Information]
  • Cook, F., Knight, J., Doble, R., Raine, S. (2013). An improved solution for the infiltration advance problem in irrigation hydraulics. Irrigation Science, 31(5), 1113-1123.
  • Knight, J., Kluitenberg, G. (2013). Correcting for finite probe diameter in the dual probe heat pulse method of measuring soil water content. 20th International Congress on Modelling and Simulation (MODSIM2013), Adelaide, Australia: Modelling and Simulation Society of Australia and New Zealand Inc (MSSANZ).
  • Cook, F., Knight, J., Kelliher, F. (2013). Modelling oxygen transport in soil with plant root and microbial oxygen consumption: Depth of oxygen penetration. Soil Research, 51(6), 539-553. [More Information]
  • Cook, F., Knight, J., Silburn, D., Kookana, R., Thorburn, P. (2013). Upscaling from paddocks to catchments of pesticide mass and concentration in runoff. Agriculture, Ecosystems and Environment, 180, 136-147. [More Information]

2012

  • Knight, J., Kluitenberg, G., Kamai, T., Hopmans, J. (2012). Semianalytical solution for dual-probe heat- pulse applications that accounts for probe radius and heat capacity. Vadose Zone Journal, 11(2). [More Information]

2011

  • Knight, J., Cook, F., Doble, R., Raine, S. (2011). An Improved Solution for the Infiltration-Advance Problem In Irrigation Hydraulics. Soil Science of America Annual Meeting.

2010

  • Knight, J., Cook, F. (2010). Analytical solution for drainage from a uniformly wetted deep soil profile. 19th World Congress of Soil Science Soil solutions for a changing world, Australia: International Union of Soil Sciences (IUSS).
  • Knight, J. (2010). Local hot spots in oxidising bagasse stockpiles. ANZIAM Conference 2010.

2009

  • Rassam, D., Pickett, T., Knight, J. (2009). Incorporating floodplain groundwater interactions in river modelling. The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation, Australia: Modelling/Simulation Society of Aus and NZ & International Assoc for Math and Comp in Simulation.
  • Cook, F., Knight, J., Humphreys, E., McHugh, A., Tisdall, J., Hamilton, G., Roth, C. (2009). Modelling of water and solutes in permanent raised beds. The 18th World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation, Australia: Modelling/Simulation Society of Aus and NZ & International Assoc for Math and Comp in Simulation.
  • Knight, J. (2009). Speed enhancement for a growth-diffusion wave travelling along an interface between two media. ANZIAM Conference.
  • Cook, F., Knight, J., Wooding, R. (2009). Steady groundwater flow to drains on a sloping bed: Comparison of solutions based on Boussinesq equation and Richards equation. Transport in Porous Media, 77(2), 357-372. [More Information]

2008

  • Knight, J. (2008). Speed enhancement for a growth-diffusion wave travelling along an interface between two media. Queensland ANZIAM Conference.
  • Warrick, A., Hinnell, A., Ferré, T., Knight, J. (2008). Steady state lateral water flow through unsaturated soil layers. Water Resources Research, 44(8). [More Information]

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