Numerical models have become much more efficient, making their application to problems increasingly widespread. User-friendly interfaces make the setup of a model much easier and more intuitive while increased computer speed can solve difficult problems in a matter of minutes. Co-authored by the software's creator, Dr. Jirka A imAZnek, Soil Physics with HYDRUS: Modeling and Applications demonstrates one- and two-dimensional simulations and computer animations of numerical models using the HYDRUS software. Classroom-tested at the University of Georgia by Dr. David Radcliffe, this volume includes numerous examples and homework problems. It provides students with access to the HYDRUS-1D program as well as the Rosseta Module, which contains large volumes of information on the hydraulic properties of soils. The authors use HYDRUS-1D for problems that demonstrate infiltration, evaporation, and percolation of water through soils of different textures and layered soils. They also use it to show heat flow and solute transport in these systems, including the effect of physical and chemical nonequilibrium conditions. The book includes examples of two-dimensional flow in fields, hillslopes, boreholes, and capillary fringes using HYDRUS (2D/3D). It demonstrates the use of two other software packages, RETC and STANMOD, that complement the HYDRUS series. Hands-on use of the windows-based codes has proven extremely effective when learning the principles of water and solute movement, even for users with very little direct knowledge of soil physics and related disciplines and with limited mathematical expertise. Suitable for teaching an undergraduate or lower level graduate course in soil physics or vadose zone hydrology, the text can also be used for self-study on how to use the HYDRUS models. With the information in this book, you can run models for different scenarios and with different parameters, and thus gain a better understanding of the physics of water flow and contaminant transport.

Table of Contents

Soil Solid Phase Introduction Soil Phases Soil Texture Soil Mineralogy Soil Structure Summary Derivations Problems Soil Water Content and Potential Introduction Energy and Work Properties of Bulk Water Properties of Water at Air and Solid Interfaces Soil Water Content Measuring Soil Water Content Soil Water Potential Measuring Soil Water Potential Components The Soil Water Retention Curve RETC Program Summary Derivations Problems Steady Water Flow in Soils Introduction Steady Flow in Saturated Soil Steady Flow in Unsaturated Soil Measurements of Hydraulic Properties Summary Derivations Heat Flow in Soils Introduction Surface Energy Balance Steady Soil Heat Flux Transient Soil Heat Flux Soil Heat Flow with Hydrus-1d Summary Derivations Problems Transient Water Flow in Soils Introduction Transient Water Flow Numerical Solutions to the Richards Equation Infiltration Redistribution Evaporation Transpiration Preferential Flow Groundwater Recharge and Discharge Inverse Solutions and Parameter Optimization Summary Derivations Problems Solute Transport Introduction Conservation and Flux Equations Advection Dispersion Equation Stanmodand Cxtfit Numerical Approaches for Solute Transport HydrusExamples of Solute Transport Summary Derivations Problems Appendix References Index

About the Author

University of Georgia, Athens, USA University of California, Riverside, USA