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Experimental Investigation of Preferential Flow in a Near-Saturated Intact Soil Sample

Result description

Hydraulic conductivity in an intact sample of coarse sandy loam from the Cambisol series containing a naturally developed, vertically connected macropore was investigated during a recurrent ponding infiltration (RPI) experiment performed over a period of30 hours, in combination with neutron tomography imaging. The RPI experiment consisted of two consecutive ponded infiltration runs, each followed by free gravitational draining of the sample. Three-dimensional neutron tomography (NT) imaging of the drysample was acquired before the infiltration began. The dynamics of the advancement of the wetting front was investigated using a sequence of neutron radiography (NR) images. Analysis of these images showed that the water front moved preferentially through the macropore at an approximate speed of 2 mm/s, significantly faster than the 0.3 mm/s wetting advancement in the surrounding soil matrix. After outflow started temporal changes in the local water content distribution were evaluated qu

Keywords

Neutron imagingSoilEntrapped airMacropore

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    Experimental Investigation of Preferential Flow in a Near-Saturated Intact Soil Sample

  • Original language description

    Hydraulic conductivity in an intact sample of coarse sandy loam from the Cambisol series containing a naturally developed, vertically connected macropore was investigated during a recurrent ponding infiltration (RPI) experiment performed over a period of30 hours, in combination with neutron tomography imaging. The RPI experiment consisted of two consecutive ponded infiltration runs, each followed by free gravitational draining of the sample. Three-dimensional neutron tomography (NT) imaging of the drysample was acquired before the infiltration began. The dynamics of the advancement of the wetting front was investigated using a sequence of neutron radiography (NR) images. Analysis of these images showed that the water front moved preferentially through the macropore at an approximate speed of 2 mm/s, significantly faster than the 0.3 mm/s wetting advancement in the surrounding soil matrix. After outflow started temporal changes in the local water content distribution were evaluated qu

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    JN - Civil engineering

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2015

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    Physics Procedia

  • ISBN

  • ISSN

    1875-3892

  • e-ISSN

  • Number of pages

    7

  • Pages from-to

    496-502

  • Publisher name

    Elsevier

  • Place of publication

    Amsterdam

  • Event location

    Grindelwald

  • Event date

    Oct 5, 2014

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article