Modeling of Irrigation, Water Flow,and Nutrient Transport in Soils(using the HYDRUS Software Packages)

Instructor

Dr. Jirka Šimůnek
University of California Riverside
Riverside, CA, USADr. Roland Baatz
Scientific Coordinator of International Soil Modelling Consortium,
Agrosphere (IBG-3), Forschungszentrum Jülich, Germany

Accra, Ghana
November 29-30 2018

Modeling of Irrigation, Water Flow,and Nutrient Transport in Soils
OVERVIEW
Global food security is an ever-increasing, worldwide problem. Over the coming decades, achanging climate, growing global population, rising food prices, and environmental stressors will
have significant yet highly uncertain impacts on food security. With almost a billion people
around the world who do not have access to a sufficient supply of nutritious and safe food,establishing global food security is important not only to hundreds of millions of hungry people,
but also to the sustainable economic growth of these nations. It is essential to increase
agricultural productivity through the use of modern irrigation techniques and other agricultural
practices and to assess the complex impact of climate change on food security.
Numerical modeling is becoming an increasingly important tool for analyzing complex problems
involving water flow, nutrient transport in the unsaturated zone, and irrigation management. This
course is designed to familiarize participants with the principles and mathematical analysis ofvariably-saturated flow and transport processes, and the application of state-of-the-art numericalcodes to site-specific subsurface flow and transport problems.

COURSE DESCRIPTION
The course begins with a detailed conceptual and mathematical description of water flow andsolute transport processes in the vadose zone. Alternative methods for describing andmodeling the hydraulic functions of unsaturated porous media are also described.
"Hands-on" computer sessions provide participants an opportunity to become familiar withthe Windows-based HYDRUS computer software packages, including several additional
modules, such as ROSETTA. Emphasis is on the preparation of input data for a variety ofapplications, including flow and transport in a soil profile with a subsurface drip, modified
atmospheric forcing and irrigation schemes. Course participants will have an opportunity touse the HYDRUS models for their own data.

COURSE SOFTWARE
The course introduces a new generation of Windows-based numerical models for simulatingwater, heat and/or contaminant transport in variably-saturated porous media. These include
the HYDRUS-1D and HYDRUS (2D/3D) codes for one- and two-dimensional simulations,
respectively, and the Rosetta code for estimating the soil hydraulic properties (and theiruncertainty) from soil texture and related data. HYDRUS-1D and HYDRUS (2D/3D) aresupported by interactive graphics-based interfaces for data-preprocessing, generation ofunstructured as well as structured finite element grid systems, and graphic presentation of thesimulation results.

COURSE HANDOUTS
Course material include lecture notes prepared by the instructor. Documentation ofHYDRUS-1D and HYDRUS 2D/3D models can be downloaded from the HYDRUS website.

COURSE INSTRUCTORs

Dr. Jirka Šimůnek is a Professor of Hydrology with the Department of Environmental Sciences ofthe University of California Riverside. He received an M.S. in Civil Engineering from the Czech
Technical University, Prague, Czech Republic, and a Ph.D. in Water Management from the Czech
Academy of Sciences, Prague. His expertise is in numerical modeling of subsurface water flow andsolute transport processes, equilibrium and nonequilibrium chemical transport, multicomponent major
ion chemistry, field-scale spatial variability, and inverse procedures for estimating the hydraulicproperties of unsaturated porous media.
He has authored and coauthored over 300 peer-reviewed journal publications, over 20 book chapters,
and two books; and according to ISI has an h-factor of 55 and over 10,000 citations. His numericmodels, HYDRUS-1D, HYDRUS-2D, and HYDRUS (2D/3D), are used by virtually all scientists,students, and practitioners modeling water flow, chemical movement, and heat transport throughvariably saturated soils.
Dr. Simunek is a recipient of the Soil Science Society of America’s (SSSA) Don and Betty Kirkham
Soil Physics Award, Fellow of American Geophysical Union (AGU), American Society of Agronomy(ASA), American Association for Advancement of Sciences (AAAS), and SSSA, and the past chair ofthe Soil Physics (S1) of SSSA. He is a co-editor of Journal of Hydrology and Hydromechanics, anassociate editor of Journal of Hydrology and Vadose Zone Journal, a former co-editor of Vadose Zone
Journal, and a former AE of Journal of Hydrological Sciences and Water Resources Research.

Dr. Roland Baatz, Scientific Coordinator of International Soil Modelling Consortium,Agrosphere (IBG-3), Forschungszentrum Jülich, Germany. Research interests: Earth system
dynamics, land surface-, ecosystem- and hydrologic processes, recent in-situ Earth observation
methods, model-data linkage.

COURSE DETAILED OUTLINEHYDRUS-1D
Lecture 1:
Lecture 2.
Computer session 1:
Computer session 2:

Vadose zone flow and transport modeling: An overview.
The HYDRUS-1D software for simulating one-dimensional variablysaturated water flow and solute transport.
HYDRUS-1D: Infiltration of water into a one-dimensional soil profile.
HYDRUS-1D: Water flow and solute transport in a layered soil profile.

HYDRUS (2D/3D)
Lecture 3:

Computer session 3:
Computer session 4:
Lecture 4:

HYDRUS (2D/3D) software for simulating two- and three-dimensionalvariably-saturated water flow and solute transport, Version 2. Domaintypes.
HYDRUS (2D/3D): Subsurface line source.
HYDRUS (2D/3D): Furrow infiltration with a solute pulse.
Selected HYDRUS modules and applications.

The use of HYDRUS on participants' data
Lectures:
Computer session:
Lectures:

Presentations of course participants of their own data and what theywould like to accomplish using the HYDRUS software.
Individual work by participants on their own datasets with anaccessional help and under the guidance of the course instructor.
Presentations of course participants of their HYDRUS simulations
using their own data.