A comparison between the single ring pressure infiltrometer and simplified falling head techniques

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Abstract

Testing the relative performances of the single ring pressure infiltrometer (PI) and simplified falling head (SFH) techniques to determine the field saturated soil hydraulic conductivity, Kfs, at the near point scale may help to better establish the usability of these techniques for interpreting and simulating hydrological processes. A sampling of 10 Sicilian sites showed that the measured Kfs was generally higher with the SFH technique than the PI one, with statistically significant differences by a factor varying from 3 to 192, depending on the site. A short experiment with the SFH technique yielded higher Kfs values because a longer experiment with the PI probably promoted short-term swelling phenomena reducing macroporosity. Moreover, the PI device likely altered the infiltration surface at the beginning of the run, particularly in the less stable soils, where soil particle arrangement may be expected to vary upon wetting. This interpretation was supported by a soil structure stability index, SSI, and also by the hydraulic conductivity data obtained with the tension infiltrometer, i.e. with a practically negligible disturbance of the sampled soil surface. In particular, a statistically significant, increasing relationship with SSI and an unsaturated conductivity greater than the saturated one were only detected for the Kfs data obtained with the PI. The SFH and PI techniques should be expected to yield more similar results in relatively rigid porousmedia (low percentages of fine particles and structurally stable soils) than in soils that modify appreciably their particle arrangement upon wetting. The simultaneous use of the two techniques may allow to improve Kfs determination in soils that change their hydrodynamic behaviour during a runoff producing rainfall event.
Lingua originaleEnglish
pagine (da-a)-
Numero di pagine11
RivistaHydrological Processes
Volume00
Stato di pubblicazionePublished - 2013

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infiltrometer
soil
hydraulic conductivity
comparison
soil structure
swelling
soil surface
infiltration
conductivity
experiment
hydrodynamics
runoff
disturbance
rainfall
sampling

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

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title = "A comparison between the single ring pressure infiltrometer and simplified falling head techniques",
abstract = "Testing the relative performances of the single ring pressure infiltrometer (PI) and simplified falling head (SFH) techniques to determine the field saturated soil hydraulic conductivity, Kfs, at the near point scale may help to better establish the usability of these techniques for interpreting and simulating hydrological processes. A sampling of 10 Sicilian sites showed that the measured Kfs was generally higher with the SFH technique than the PI one, with statistically significant differences by a factor varying from 3 to 192, depending on the site. A short experiment with the SFH technique yielded higher Kfs values because a longer experiment with the PI probably promoted short-term swelling phenomena reducing macroporosity. Moreover, the PI device likely altered the infiltration surface at the beginning of the run, particularly in the less stable soils, where soil particle arrangement may be expected to vary upon wetting. This interpretation was supported by a soil structure stability index, SSI, and also by the hydraulic conductivity data obtained with the tension infiltrometer, i.e. with a practically negligible disturbance of the sampled soil surface. In particular, a statistically significant, increasing relationship with SSI and an unsaturated conductivity greater than the saturated one were only detected for the Kfs data obtained with the PI. The SFH and PI techniques should be expected to yield more similar results in relatively rigid porousmedia (low percentages of fine particles and structurally stable soils) than in soils that modify appreciably their particle arrangement upon wetting. The simultaneous use of the two techniques may allow to improve Kfs determination in soils that change their hydrodynamic behaviour during a runoff producing rainfall event.",
author = "Giorgio Baiamonte and Massimo Iovino and Vincenzo Bagarello and {Di Prima}, Simone and Castellini",
year = "2013",
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TY - JOUR

T1 - A comparison between the single ring pressure infiltrometer and simplified falling head techniques

AU - Baiamonte, Giorgio

AU - Iovino, Massimo

AU - Bagarello, Vincenzo

AU - Di Prima, Simone

AU - Castellini, null

PY - 2013

Y1 - 2013

N2 - Testing the relative performances of the single ring pressure infiltrometer (PI) and simplified falling head (SFH) techniques to determine the field saturated soil hydraulic conductivity, Kfs, at the near point scale may help to better establish the usability of these techniques for interpreting and simulating hydrological processes. A sampling of 10 Sicilian sites showed that the measured Kfs was generally higher with the SFH technique than the PI one, with statistically significant differences by a factor varying from 3 to 192, depending on the site. A short experiment with the SFH technique yielded higher Kfs values because a longer experiment with the PI probably promoted short-term swelling phenomena reducing macroporosity. Moreover, the PI device likely altered the infiltration surface at the beginning of the run, particularly in the less stable soils, where soil particle arrangement may be expected to vary upon wetting. This interpretation was supported by a soil structure stability index, SSI, and also by the hydraulic conductivity data obtained with the tension infiltrometer, i.e. with a practically negligible disturbance of the sampled soil surface. In particular, a statistically significant, increasing relationship with SSI and an unsaturated conductivity greater than the saturated one were only detected for the Kfs data obtained with the PI. The SFH and PI techniques should be expected to yield more similar results in relatively rigid porousmedia (low percentages of fine particles and structurally stable soils) than in soils that modify appreciably their particle arrangement upon wetting. The simultaneous use of the two techniques may allow to improve Kfs determination in soils that change their hydrodynamic behaviour during a runoff producing rainfall event.

AB - Testing the relative performances of the single ring pressure infiltrometer (PI) and simplified falling head (SFH) techniques to determine the field saturated soil hydraulic conductivity, Kfs, at the near point scale may help to better establish the usability of these techniques for interpreting and simulating hydrological processes. A sampling of 10 Sicilian sites showed that the measured Kfs was generally higher with the SFH technique than the PI one, with statistically significant differences by a factor varying from 3 to 192, depending on the site. A short experiment with the SFH technique yielded higher Kfs values because a longer experiment with the PI probably promoted short-term swelling phenomena reducing macroporosity. Moreover, the PI device likely altered the infiltration surface at the beginning of the run, particularly in the less stable soils, where soil particle arrangement may be expected to vary upon wetting. This interpretation was supported by a soil structure stability index, SSI, and also by the hydraulic conductivity data obtained with the tension infiltrometer, i.e. with a practically negligible disturbance of the sampled soil surface. In particular, a statistically significant, increasing relationship with SSI and an unsaturated conductivity greater than the saturated one were only detected for the Kfs data obtained with the PI. The SFH and PI techniques should be expected to yield more similar results in relatively rigid porousmedia (low percentages of fine particles and structurally stable soils) than in soils that modify appreciably their particle arrangement upon wetting. The simultaneous use of the two techniques may allow to improve Kfs determination in soils that change their hydrodynamic behaviour during a runoff producing rainfall event.

UR - http://hdl.handle.net/10447/92190

M3 - Article

VL - 00

SP - -

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

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