Summary
Numerous laboratory studies have indicated that thermal gradients may produce appreciable soil water movement in the absence of a strong suction field. In addition the soil water flow and thermal properties are physically interrelated. This paper presents field data taken during needle ice events at Vancouver, Canada, and yields an indication of the magnitude of interaction between the thermal and water flow properties. This feedback determines the state of soil frost hazard in a location where damage to plant material is produced by ice frost hazard in a location where damage to plant material is produced by ice needle growth. Further apparently anomalous interruption in the normal parabolic temperature-time pattern during radiation events is interpreted as the product of water flow down a thermal gradient.
Zusammenfassung
Zahlreiche Laboratoriumsstudien deuteten darauf hin, daß thermische Gradienten selbst bei Abwesenheit starker Saugkräfte bedeutsame Wasserbewegungen im Boden hervorrufen können. Überdies stehen die Strömung des Bodenwassers und die thermischen Eigenschaften des Bodens damit in physikalischem Zusammenhang. Die vorliegende Arbeit enthält Meßdaten, die während der Bildung von Nadeleis in Vancouver, Kanada, gewonnen wurden und größenordnungsmäßige Beziehungen zwischen Wärme- und Wasserstrom im Boden angeben. Die Rückkopplung zwischen den beiden Strömen bestimmt die Bodenfrostgefahr an Orten, wo Pflanzenschäden durch Eisnadelbildung hervorgerufen werden. Eine offensichtlich abnormale Unterbrechung des normalen Temperatur-Zeit-Verhältnisses während des Ausstrahlungsvorganges wird als Effekt der Wasserströmung entsprechend einem einem thermischen Gradienten interpretiert.
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References
Brunt, D.: Physical and Dynamical Meteorology. Cambridge University Press, 1934.
Cary, J. W.: Water Flux in Moist Soils: Thermal Versus Suction Gradients. Soil Science100, 168–175 (1965).
De Vries, D. A.: Thermal Properties of Soils. In: The Physics of Plant Environment (W. R. van Wijk, ed.). North Holland Publishing Co., 1966.
De Vries, D. A.: In Site Determination of Physical Properties of the Surface Layer of Field Soils. Soil Science Soc. America Proceed.33, 349–353 (1969).
Funk, J. P.: Radiative Flux Divergence on Radiative Fog. Quart. Journ. Roy. Met. Soc.88, 233–249 (1962).
Kinosita, S.,et al: Formation of Ice Columns on Electrically Heated Ground. Low Temperature Science.
Kreith, F.: Principles of Heat Transfer. International, Scranton, Pennsylvania, 1967.
Lettau, H.: Problems of Micrometeorological Measurements. In: The Collection and Processing of Field Data (E. F. Bradley andO. T. Denmead, eds.). CSIRO Symposium, Interscience, 1967.
Myrup, L.: A Numerical Model of the Urban Heat Island. Journal. Applied Meteorology8, 908–918 (1969).
Outcalt, S. I.: Weather and Diurnal Frozen Soil Structure at Charlottesville, Virginia. Water Resource Research5, 1377–1381 (1969).
Outcalt, S. I.: A Study of Time Dependence During Serial Needle Ice Events At Vancour, Canada. Arch. Met. Geoph. Biokl., A,19, 329–337 (1970).
Van Wijk, J. R.: General Temperature Variations in a Homogenouous Soil. In: The Physics of Plant Environment (Van Wijk, ed.). North Holland Publishing Co., 1966.
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Outcalt, S.I. Field observations of soil temperature and water tension feedback effects on needle ice nights. Arch. Met. Geoph. Biokl. A. 20, 43–53 (1971). https://doi.org/10.1007/BF02247747
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DOI: https://doi.org/10.1007/BF02247747