DualPerm Module

The DualPerm module [Šimůnek et al., 2003; Šimůnek and van Genuchten, 2008] for the HYDRUS (2D/3D) software package simulates two-dimensional variably-saturated water movement and solute transport in dual-permeability porous media.

The dual-permeability flow and transport model assumes that soil consists of two mobile pore regions, one representing the matrix and one the macropores. The dual-permeability formulation for water flow is based on a mixed form of the Richards equation, describing water flow in both the fractures (macropores) and the matrix (micropores) domains [Gerke and van Genuchten, 1993a]. The dual-permeability formulation for solute transport is based on a convection-dispersion equation, describing solute transport in both the fractures (macropores) and the matrix (micropores) domains [Gerke and van Genuchten, 1993a]. The mass transfer of water between the two domains is driven by the gradient of pressure heads. The mass transfer for solute includes both convective mass transfer with water mass transfer, as well as diffusive mass transfer driven by the concentration gradient. The DualPerm module is not intended for large transport domains and should be used preferable for smaller domains.

User and Technical Manual:

Šimůnek, J., M. Šejna, and M. Th. van Genuchten, The DualPerm Module for HYDRUS (2D/3D) Simulating Two-Dimensional Water Movement and Solute Transport in Dual-Permeability Porous Media, Version 1.0, PC Progress, Prague, Czech Republic, 32 pp., 2012.

The mathematical description used in the Dual-Permeability Models.