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dc.contributor.authorPeck, Lindamae.-
dc.descriptionTechnical Report-
dc.description.abstractThis report presents the results of a systematic investigation of the variation in soil surface temperatures predicted by the numerical model FASST (Fast All Seasons Soil Strength), using different values of soil physical, thermal, and optical parameters. Soil hydraulic properties were not varied. Single-factor experiments have shown that the major soil parameters for FASST predictions are, in descending order, initial volumetric soil moisture content, bulk density of the dry soil material, albedo (sunny days), and porosity. The thermal conductivity of the dry soil material has a minor effect on predicted soil temperature. Quartz content, specific heat of the dry soil material, and emissivity each has a negligible effect on predicted soil temperature. Experiments varying several soil parameters simultaneously produced temperature differences (relative to a standard soil) for some combinations of factors that are larger than were obtained by varying a single major soil factor. This highlights the difficulty of associating a measure of confidence with a given FASST simulation, i.e., how closely predicted temperatures will match actual soil temperatures for a given soil type and weather scenario, given that the predicted temperature depends on the cumulative effect of the accuracy of the value assigned to each of the significant soil parameters.-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesERDC/CRREL ; TR-06-9.-
dc.subjectSoil temperature-
dc.titleVariations in FASST predictions of soil surface temperatures-
Appears in Collections:Technical Report

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