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UNSAT-H Version 3.0:Unsaturated Soil Water and Heat Flow Model: Theory, User Manual, and Examples
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Abstract
The UNSAT-H model was developed at Pacific Northwest National Laboratory (PNNL) to assess the water dynamics of arid sites and, in particular, estimate recharge fluxes for scenarios pertinent to waste disposal facilities. To achieve the above goals for assessing water dynamics and estimating recharge rates, the UNSAT-H addresses soil water infiltration, redistribution, evaporation, plant transpiration, deep drainage, and soil heat flow. The UNSAT-H model simulates liquid water flow using the Richards equation, water vapor diffusion using Fick's law, and sensible heat flow using the Fourier equation. This report documents UNSAT-H Version 3.0. The report includes the bases for the conceptual model and its numerical implementation, benchmark test cases, example simulations involving layered soils and plants, and the code manual. Version 3.0 is an enhanced-capability update of UNSAT-H Version 2.0 (Fayer Jones 1990). New features include hysteresis, an iterative solution of head and temperature, an energy balance check, the modified Picard solution technique, additional hydraulic functions, multiple year simulation capability, and general enhancements. This report includes eight example problems. The first four are verification tests of UNSAT-H capabilities. The second four example problems are demonstrations of real-world situations.
- Authors:
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 15001068
- Report Number(s):
- PNNL-13249
820201000; TRN: US200401%%396
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Technical Report
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; BENCHMARKS; DIFFUSION; DRAINAGE; ENERGY BALANCE; EVAPORATION; HEAT FLUX; HYDRAULICS; HYSTERESIS; SOILS; TRANSPIRATION; VERIFICATION; WASTE DISPOSAL; WATER INFLUX; WATER VAPOR; recharge; soil water drainage; vadose zone
Citation Formats
Fayer, Michael J. UNSAT-H Version 3.0:Unsaturated Soil Water and Heat Flow Model: Theory, User Manual, and Examples. United States: N. p., 2000.
Web. doi:10.2172/15001068.
Fayer, Michael J. UNSAT-H Version 3.0:Unsaturated Soil Water and Heat Flow Model: Theory, User Manual, and Examples. United States. https://doi.org/10.2172/15001068
Fayer, Michael J. 2000.
"UNSAT-H Version 3.0:Unsaturated Soil Water and Heat Flow Model: Theory, User Manual, and Examples". United States. https://doi.org/10.2172/15001068. https://www.osti.gov/servlets/purl/15001068.
@article{osti_15001068,
title = {UNSAT-H Version 3.0:Unsaturated Soil Water and Heat Flow Model: Theory, User Manual, and Examples},
author = {Fayer, Michael J},
abstractNote = {The UNSAT-H model was developed at Pacific Northwest National Laboratory (PNNL) to assess the water dynamics of arid sites and, in particular, estimate recharge fluxes for scenarios pertinent to waste disposal facilities. To achieve the above goals for assessing water dynamics and estimating recharge rates, the UNSAT-H addresses soil water infiltration, redistribution, evaporation, plant transpiration, deep drainage, and soil heat flow. The UNSAT-H model simulates liquid water flow using the Richards equation, water vapor diffusion using Fick's law, and sensible heat flow using the Fourier equation. This report documents UNSAT-H Version 3.0. The report includes the bases for the conceptual model and its numerical implementation, benchmark test cases, example simulations involving layered soils and plants, and the code manual. Version 3.0 is an enhanced-capability update of UNSAT-H Version 2.0 (Fayer Jones 1990). New features include hysteresis, an iterative solution of head and temperature, an energy balance check, the modified Picard solution technique, additional hydraulic functions, multiple year simulation capability, and general enhancements. This report includes eight example problems. The first four are verification tests of UNSAT-H capabilities. The second four example problems are demonstrations of real-world situations.},
doi = {10.2172/15001068},
url = {https://www.osti.gov/biblio/15001068},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 15 00:00:00 EDT 2000},
month = {Thu Jun 15 00:00:00 EDT 2000}
}