Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/12322
Title: CALGYP : a simulation model for calcite and gypsum precipitation-dissolution in soils
Authors: Marion, Giles M. (Giles Michael)
Keywords: Calcite
Computer modeling
Chemical precipitation
Gypsum
Evapotranspiration
Rainfall
Computer models
Computer modeling
Computer simulations
CALGYP
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 94-19.
Description: Special Report
Abstract: This report documents the CALGYP model which is designed to simulate calcite and gypsum precipitation-dissolution in soils. CALGYP is a process model that is easy to parameterize, and is designed for long-term simulations (>1000years). The CALGYP model has five components: soil parameterization, chemical thermodynamic relations, deterministic and stochastic rainfall models, an evapotranspiration model, and subroutines that calculate water, calcium, and sulfate fluxes through the soil. The stochastic rainfall model is based on probability distributions for interarrival times (days between rainfall events) and rainfall amounts and is designed to simulate the long-term mean annual rainfall and variability in annual rainfall for specific sites. The model is currently parameterized for seven climatic sites in the desert Southwest. However, climate (temperature and rainfall) can be altered and other minerals included, which makes the CALGYP model potentially applicable across a wider range of environmental conditions including freezing-thawing systems. A separate program, Rain module, is included to facilitate inclusion of new sites and to alter rainfall patterns for current sites. Instructions for utilization and a FORTRAN-77 source code listing are included with the report.
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/12322
Appears in Collections:Special Report

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