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Introduction to HYDRUS-1D

Introduction to HYDRUS-1D. SOIL 6010 September 2011 T.E. Ochsner. HYDRUS-1D. Linear finite element model Numerically solves Richards’ equation for saturated and unsaturated flow Numerically solves advection-dispersion equations for heat and solute transport

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Introduction to HYDRUS-1D

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  1. Introduction to HYDRUS-1D SOIL 6010 September 2011 T.E. Ochsner

  2. HYDRUS-1D • Linear finite element model • Numerically solves Richards’ equation for saturated and unsaturated flow • Numerically solves advection-dispersion equations for heat and solute transport • Includes sink term to simulate root water uptake • Can simulate gaseous diffusion • Can simulate numerous reactions

  3. Primary developer • JirkaSimunek • Ph.D., 1993, Czech Academy of Sciences, Prauge • USDA ARS, US Salinity Laboratory, 1992-? • with van Genuchten • University of California-Riverside, presently

  4. History of development of HYDRUS and related software packages. Software packages supported by graphical user interfaces are in color (2D, blue; 2D/3D, red). Simunek, J., M.T. van Genuchten, and M. Sejna. 2008. Development and applications of the HYDRUS and STANMOD software packages and related codes. Vadose Zone J. 7:587-600.10.2136/vzj2007.0077.

  5. Partial list of governing equations • Uniform water flow • Coupled liquid and vapor flow • Dual-porosity

  6. Physical nonequilibrium models

  7. “Mass-lumped finite element scheme” • Leads to an equivalent finite difference scheme

  8. Obtaining and Installing HYDRUS-1D • Go to: http://www.pc-progress.com/en/Default.aspx?H1d-downloads • Download latest version (4.14 currently) • Extract files from self-extracting archive to a temporary directory. • Run “setup.exe” from that directory

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