Subsurface flow and large-scale lateral saturated soil hydraulic conductivity in a Mediterranean hillslope with contrasting land uses

Massimo Iovino, Vincenzo Bagarello, Marcello Niedda, Mirko Castellini, Filippo Giadrossich, Mario Pirastru, Roberto Marrosu

Risultato della ricerca: Article

4 Citazioni (Scopus)

Abstract

The lateral saturated hydraulic conductivity, Ks,l, is the soil property that mostly governs subsurface flow in hillslopes. Determinations of Ks,lat the hillslope scale are expected to yield valuable information for interpreting and modeling hydrological processes since soil heterogeneities are functionally averaged in this case. However, these data are rare since the experiments are quite difficult and costly. In this investigation, that was carried out in Sardinia (Italy), large-scale determinations of Ks,lwere done in two adjacent hillslopes covered by a Mediterranean maquis and grass, respectively, with the following objectives: i) to evaluate the effect of land use change on Ks,l, and ii) to compare estimates of Ks,lobtained under natural and artificial rainfall conditions. Higher Ks,lvalues were obtained under the maquis than in the grassed soil since the soil macropore network was better connected in the maquis soil. The lateral conductivity increased sharply close to the soil surface. The sharp increase of Ks,lstarted at a larger depth for the maquis soil than the grassed one. The Ks,lvalues estimated during artificial rainfall experiments agreed with those obtained during the natural rainfall periods. For the grassed site, it was possible to detect a stabilization of Ks,lin the upper soil layer, suggesting that flow transport capacity of the soil pore system did not increase indefinitely. This study highlighted the importance of the experimental determination of Ks,lat the hillslope scale for subsurface modeling, and also as a benchmark for developing appropriate sampling methodologies based on near-point estimation of Ks,l.
Lingua originaleEnglish
pagine (da-a)297-306
Numero di pagine10
RivistaJournal of Hydrology and Hydromechanics
Volume65
Stato di pubblicazionePublished - 2017

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Hydraulic conductivity
subsurface flow
hillslope
Land use
hydraulic conductivity
Soils
land use
soil
rainfall
Rain
hydrological modeling
macropore
land use change
soil property
stabilization
soil surface
conductivity
experiment
grass
methodology

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

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Subsurface flow and large-scale lateral saturated soil hydraulic conductivity in a Mediterranean hillslope with contrasting land uses. / Iovino, Massimo; Bagarello, Vincenzo; Niedda, Marcello; Castellini, Mirko; Giadrossich, Filippo; Pirastru, Mario; Marrosu, Roberto.

In: Journal of Hydrology and Hydromechanics, Vol. 65, 2017, pag. 297-306.

Risultato della ricerca: Article

Iovino, Massimo ; Bagarello, Vincenzo ; Niedda, Marcello ; Castellini, Mirko ; Giadrossich, Filippo ; Pirastru, Mario ; Marrosu, Roberto. / Subsurface flow and large-scale lateral saturated soil hydraulic conductivity in a Mediterranean hillslope with contrasting land uses. In: Journal of Hydrology and Hydromechanics. 2017 ; Vol. 65. pagg. 297-306.
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abstract = "The lateral saturated hydraulic conductivity, Ks,l, is the soil property that mostly governs subsurface flow in hillslopes. Determinations of Ks,lat the hillslope scale are expected to yield valuable information for interpreting and modeling hydrological processes since soil heterogeneities are functionally averaged in this case. However, these data are rare since the experiments are quite difficult and costly. In this investigation, that was carried out in Sardinia (Italy), large-scale determinations of Ks,lwere done in two adjacent hillslopes covered by a Mediterranean maquis and grass, respectively, with the following objectives: i) to evaluate the effect of land use change on Ks,l, and ii) to compare estimates of Ks,lobtained under natural and artificial rainfall conditions. Higher Ks,lvalues were obtained under the maquis than in the grassed soil since the soil macropore network was better connected in the maquis soil. The lateral conductivity increased sharply close to the soil surface. The sharp increase of Ks,lstarted at a larger depth for the maquis soil than the grassed one. The Ks,lvalues estimated during artificial rainfall experiments agreed with those obtained during the natural rainfall periods. For the grassed site, it was possible to detect a stabilization of Ks,lin the upper soil layer, suggesting that flow transport capacity of the soil pore system did not increase indefinitely. This study highlighted the importance of the experimental determination of Ks,lat the hillslope scale for subsurface modeling, and also as a benchmark for developing appropriate sampling methodologies based on near-point estimation of Ks,l.",
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AU - Giadrossich, Filippo

AU - Pirastru, Mario

AU - Marrosu, Roberto

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