1st Edition

Soil Physics with HYDRUS Modeling and Applications

By David E. Radcliffe, Jiri Simunek Copyright 2010
    392 Pages 260 B/W Illustrations
    by CRC Press

    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 Šimůnek, 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 Rosetta 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.

    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

    Biography

    David E. Radcliffe, Jiri Simunek