LEACHM (Leaching Estimation and Chemistry Model) is a public-domain, unsaturated zone numerical model simulator (Hutson, 2003). LEACHM is a widely used unsaturated zone simulator (e.g., Sogbedji et al., 2001a; Asada et al., 2013) that has been extensively benchmarked against similar codes such as HYDRUS (e.g., Nolan et al., 2005; Sarmah et al., 2006; Ogorzalek et al., 2008). It is a process-based model that uses a finite difference approximation of the Richards’ equation to solve for water flow and the convection–dispersion equation to simulate solute transport in variably water-saturated soils. Flow of water and solutes through the unsaturated zone is simulated in response to time-varying precipitation, evaporation, transpiration, temperature, and runoff. Solutes are transported by advection, dispersion and diffusion and may be retarded by sorption onto soil particles and/or soil organic matter.
LEACHM has recently been modified to include air water interfacial sorption processes (Wallis et al., 2022). This code is named LEACHE and is provided here for download, including user documentation.
Flinders University (including its employees and consultants) excludes all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using LEACHE (in part or in whole) and any information or material contained in it.
The source code to LEACHE is available from John Hutson (Flinders University: john.hutson@flinders.edu.au) to anyone who wishes to check details of model procedures.
Downloads:
