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Soil Science Society of America Journal Abstract -

Field- and Laboratory-Determined Hydraulic Conductivities Considering Anisotropy and Core Surface Area

 

This article in SSSAJ

  1. Vol. 57 No. 1, p. 10-15
     
    Received: Aug 27, 1991


    * Corresponding author(s):
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doi:10.2136/sssaj1993.03615995005700010003x
  1. Olivier Banton 
  1. INRS-Eau, Université du Québec, 2800 rue Einstein, CP 7500, Sainte-Foy, Québec, Canada G1V 4C7

Abstract

Abstract

The influence of the measurement method on the values of the mean and standard deviation of saturated hydraulic conductivities, Ks, has not been extensively studied. This study examines the dependence of these statistical characteristics of Ks on the sampled soil volume. Statistical characteristics of Ks for a sandy loam soil determined by field and laboratory techniques differed greatly. However, if anisotropy in hydraulic conductivity induced by soil structure and macropores is considered, the mean of field vertical Ks (Kvs) approaches that of laboratory Ks. Furthermore, geostatistical variograms of log(Ks) and the regression analysis (field/laboratory) demonstrate the spatial independence of Ks. Thus, when generating Ks values for larger soil cores, standard deviation approaches field Kvs. When the investigated areas are the same for both methods, mean and scattering of field-and laboratory-measured values become closer. These results show that the method as well as the measurement area greatly affect the representativeness of measured Ks values and their scattering.

This work was supported by the Natural Sciences and Engineering Research Council of Canada.

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