Field Testing Parameter Sensitivity of the Two-Term Infiltration EquationUsing Differentiated Linearization

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Abstract

Knowledge of soil hydraulic conductivity in the vadose zone is important in many agronomic, engineering and environmental areas. Transient tension infiltrometer experiments can be used to estimate the hydraulic conductivity, K0, corresponding to a given pressure head by the single-test (TST) method that uses the coefficients C1 and C2 of the two-term infiltration equation. The “Differentiated Linearization” (DL) method has been proposed to estimate these coefficients when a layer of contact material is used for the experiment. A field test of the DL and TST methods was conducted on a sandy loam and a clay soil. Eliminating the early-time influence of the contact layer was easy when the sorptivity of the contact material was 10-12 times higher than the soil sorptivity. In the other cases, a transition zone, complicating application of the DL method, appeared between the decreasing and increasing portions of the data set. Therefore, applicability of the DL method required high differences in capillary forces between the contact material and the soil. The estimates of K0 varied by up to 650% with the duration of the experiment and by less than 50% with the time interval between readings at the water reservoir. Sensitivity of K0 to the experiment duration was particularly remarkable in the sandy loam soil for short durations. Considering a minimum duration of the experiment of approximately an hour caused estimates of K0 to vary by a maximum of 40% with the duration of the experiment.
Lingua originaleEnglish
pagine (da-a)358-367
Numero di pagine10
RivistaVadose Zone Journal
Volume2
Stato di pubblicazionePublished - 2003

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infiltration (hydrology)
infiltration
duration
hydraulic conductivity
experiment
testing
sandy loam
infiltrometers
soil
methodology
water reservoirs
vadose zone
infiltrometer
sandy loam soils
clay soils
engineering
clay soil
transition zone
parameter
method

All Science Journal Classification (ASJC) codes

  • Soil Science

Cita questo

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title = "Field Testing Parameter Sensitivity of the Two-Term Infiltration EquationUsing Differentiated Linearization",
abstract = "Knowledge of soil hydraulic conductivity in the vadose zone is important in many agronomic, engineering and environmental areas. Transient tension infiltrometer experiments can be used to estimate the hydraulic conductivity, K0, corresponding to a given pressure head by the single-test (TST) method that uses the coefficients C1 and C2 of the two-term infiltration equation. The “Differentiated Linearization” (DL) method has been proposed to estimate these coefficients when a layer of contact material is used for the experiment. A field test of the DL and TST methods was conducted on a sandy loam and a clay soil. Eliminating the early-time influence of the contact layer was easy when the sorptivity of the contact material was 10-12 times higher than the soil sorptivity. In the other cases, a transition zone, complicating application of the DL method, appeared between the decreasing and increasing portions of the data set. Therefore, applicability of the DL method required high differences in capillary forces between the contact material and the soil. The estimates of K0 varied by up to 650{\%} with the duration of the experiment and by less than 50{\%} with the time interval between readings at the water reservoir. Sensitivity of K0 to the experiment duration was particularly remarkable in the sandy loam soil for short durations. Considering a minimum duration of the experiment of approximately an hour caused estimates of K0 to vary by a maximum of 40{\%} with the duration of the experiment.",
keywords = "Soil hydraulic conductivity, tension infiltrometer",
author = "Vincenzo Bagarello and Massimo Iovino",
year = "2003",
language = "English",
volume = "2",
pages = "358--367",
journal = "Vadose Zone Journal",
issn = "1539-1663",
publisher = "Soil Science Society of America",

}

TY - JOUR

T1 - Field Testing Parameter Sensitivity of the Two-Term Infiltration EquationUsing Differentiated Linearization

AU - Bagarello, Vincenzo

AU - Iovino, Massimo

PY - 2003

Y1 - 2003

N2 - Knowledge of soil hydraulic conductivity in the vadose zone is important in many agronomic, engineering and environmental areas. Transient tension infiltrometer experiments can be used to estimate the hydraulic conductivity, K0, corresponding to a given pressure head by the single-test (TST) method that uses the coefficients C1 and C2 of the two-term infiltration equation. The “Differentiated Linearization” (DL) method has been proposed to estimate these coefficients when a layer of contact material is used for the experiment. A field test of the DL and TST methods was conducted on a sandy loam and a clay soil. Eliminating the early-time influence of the contact layer was easy when the sorptivity of the contact material was 10-12 times higher than the soil sorptivity. In the other cases, a transition zone, complicating application of the DL method, appeared between the decreasing and increasing portions of the data set. Therefore, applicability of the DL method required high differences in capillary forces between the contact material and the soil. The estimates of K0 varied by up to 650% with the duration of the experiment and by less than 50% with the time interval between readings at the water reservoir. Sensitivity of K0 to the experiment duration was particularly remarkable in the sandy loam soil for short durations. Considering a minimum duration of the experiment of approximately an hour caused estimates of K0 to vary by a maximum of 40% with the duration of the experiment.

AB - Knowledge of soil hydraulic conductivity in the vadose zone is important in many agronomic, engineering and environmental areas. Transient tension infiltrometer experiments can be used to estimate the hydraulic conductivity, K0, corresponding to a given pressure head by the single-test (TST) method that uses the coefficients C1 and C2 of the two-term infiltration equation. The “Differentiated Linearization” (DL) method has been proposed to estimate these coefficients when a layer of contact material is used for the experiment. A field test of the DL and TST methods was conducted on a sandy loam and a clay soil. Eliminating the early-time influence of the contact layer was easy when the sorptivity of the contact material was 10-12 times higher than the soil sorptivity. In the other cases, a transition zone, complicating application of the DL method, appeared between the decreasing and increasing portions of the data set. Therefore, applicability of the DL method required high differences in capillary forces between the contact material and the soil. The estimates of K0 varied by up to 650% with the duration of the experiment and by less than 50% with the time interval between readings at the water reservoir. Sensitivity of K0 to the experiment duration was particularly remarkable in the sandy loam soil for short durations. Considering a minimum duration of the experiment of approximately an hour caused estimates of K0 to vary by a maximum of 40% with the duration of the experiment.

KW - Soil hydraulic conductivity

KW - tension infiltrometer

UR - http://hdl.handle.net/10447/51783

M3 - Article

VL - 2

SP - 358

EP - 367

JO - Vadose Zone Journal

JF - Vadose Zone Journal

SN - 1539-1663

ER -