HYSTERESIS FOR MUTUALLY SCALING CORE AND PEDON SCALE HYDRAULIC BEHAVIOURS (Abstract/Poster in atti di convegno)

Type
Label
  • HYSTERESIS FOR MUTUALLY SCALING CORE AND PEDON SCALE HYDRAULIC BEHAVIOURS (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Coppola (1) and A. Basile (2) (2004)
    HYSTERESIS FOR MUTUALLY SCALING CORE AND PEDON SCALE HYDRAULIC BEHAVIOURS
    in EGU 2004, Nice
    (literal)
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  • A. Coppola (1) and A. Basile (2) (literal)
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  • ISSN: 1607-7962 (literal)
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  • 6 (literal)
Rivista
Note
  • Abstract (literal)
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  • (1) Department for Management of Agro-Forestry Systems (DITEC), University of Basilicata, Potenza, Italy (2) Institute for Mediterranean Agro-Forestry (ISAFOM), National Research Council, Ercolano (NA), Italy (literal)
Titolo
  • HYSTERESIS FOR MUTUALLY SCALING CORE AND PEDON SCALE HYDRAULIC BEHAVIOURS (literal)
Abstract
  • Field scale and laboratory scale methods are being continually employed to determine soil hydraulic properties. In situ hydraulic characterizations are carried out following flows along a profile consisting of soil horizons. Use is commonly made of the term pedon to define this minimum three-dimensional spatial unit of soil. At this scale measurements are both difficult to perform and time expensive, though the pedon is recognized as the 'central scale' in order to solve problems related to water flow processes: smaller scales of measurement need the definition of REV and larger scales requires an up-scaling procedure. Laboratory measurements are more straightforward than those at pedon scale, but their validity is essentially related to the sample sizes, which have to appropriately represent the heterogeneity of the medium being studied. Surveys and comparisons of field and laboratory methods have been supplied by various authors, with a view to highlighting applicative limits and possibilities. The differences found in the laboratory and field measured hydraulic characteristics are commonly explained by the differences in the measurement scale, influence of the sample size and assumptions underlying the methods. In this study hysteretic effects are used to explain the differences observed in the constitutive soil-water relationships as obtained from either laboratory or in-situ experiments. For the pedon and laboratory hydraulic characterisation, the instantaneous profile method and the evaporation method were performed, respectively. In both cases, soil hydraulic conductivities were evaluated by applying the same calculation algorithm. Through experimental evidences, the following main findings were produced: i) the difference in the obtained hydraulic characteristics is the result of different hysteretic paths due to the wetting procedure and wetting/drying history; ii) the representativeness of the selected laboratory support size (REV) was demonstrated; iii) a simple procedure was derived to relate laboratory and field hydraulic properties, iv) a procedure combining drastically shortened field experiment and laboratory tests was proposed for deriving the field hydraulic behaviour. (literal)
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