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CHEMFLO: ONE-DIMENSIONAL WATER AND CHEMICAL MOVEMENT IN UNSATURATED SOILS
Citation:
Nofziger, D., K. Rajender, S. Nayudu, AND P. Su. CHEMFLO: ONE-DIMENSIONAL WATER AND CHEMICAL MOVEMENT IN UNSATURATED SOILS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/8-89/076 (NTIS PB90126020), 1989.
Description:
An interactive software system was developed to enable decision-makers, regulators, policy-makers, scientists, consultants, and students to simulate the movement of waterand chemicals in unsaturated soils. Water movement is modeled using Richards (1931) - equation. Chemical transport is modeled by means of the convection-dispersion equation. These equations are solved numerically for one-dimensional flow and transport using finite differences. Results of the water model can be displayed in the form of graphs of water content, matric potential, driving force, conductivity, and flux density of water versus distance or time. Graphs of concentration, and flux density of chemical as functions of distance or time can also be displayed. Cumulative fluxes of water and chemical and total mass of chemical in the soil can be displayed as functions of time. Tabular outputs are also available. This manual presents the mathematical equations and the numerical techniques used in the software. Limitations of the model are presented. Instructions for installing the software on your computer are given along with illustrations of its use. Finally, a set of numerical experiments are presented to enable the user to gain an understanding of the dynamic processes involved in water movement and chemical transport in soils. The software was written for use with IBM compatible microcomputers with 640 K bytes of random access memory, two floppy disk drives or one floppy disk and one fixed disk, or CGA, EGA, or VGA graphics cards, and an 80x87 math coprocessor.
