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Thermal Properties of a Pumice Soil
Author(s) -
Cochran P. H.,
Boersma L.,
Youngberg C. T.
Publication year - 1967
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1967.03615995003100040013x
Subject(s) - pumice , geology , impact crater , pinus contorta , volcano , mineralogy , environmental science , geochemistry , forestry , physics , astronomy , geography
Dacite pumice materials deposited by the eruption of Mount Mazama cover a land area for as much as 161 km (100 miles) north and east of Crater Lake, Oregon. Frequent night frosts occur in this region. Thermal properties of the pumice material were investigated to determine their affect on the occurrence of low temperatures in the area and thus gain a better understanding of the factors governing the distribution of lodgepole ( Pinus contorta Dougl.) and ponderosa pine ( Pinus ponderosa Laws). Thermal conductivities were determined experimentally with a line heat source and calculated theoretically. The theoretical calculations were based on methods which take into account the volume fractions of solid, air, and water of the pumice and the thermal conductivity of each one of these components. The thermal conductivities of dacite pumice were found to be very low, which may account for the frequent occurrence of night frost in this region.