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פותח על ידי קלירמאש פתרונות בע"מ -
Estimating hydraulic properties of rainfall-induced soil surface seals from infiltration experiments and X-ray bulk density measurements
Year:
2007
Source of publication :
Journal of Hydrology
Authors :
אסולין, שמואל
;
.
Volume :
341
Co-Authors:
Augeard, B., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Assouline, S., The institut of Soil, Water and Environmental Sciences, Volcani Center, P.O. Box 6, Bet-Dagan, 50250, Israel
Fonty, A., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Kao, C., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Vauclin, M., Laboratoire d'Etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564 (CNRS, INPG, IRD, UJF), BP 53, 38041 Grenoble Cedex 9, France
Facilitators :
From page:
12
To page:
26
(
Total pages:
15
)
Abstract:
Soil and surface seal hydraulic properties were determined from simulated rainfall experiments by the inverse method applied to the Richards equation. Measurements used for the estimation include the soil water pressure head versus time at two distances from the soil surface, the transient infiltration rate at the soil surface and the drainage rates at the bottom of the soil profile. Seal properties were evaluated using a model that simulates changes in the seal bulk density with respect to time and space. Uncertainties, correlations and sensitivities of the soil and seal parameters were quantified to evaluate the accuracy of the model estimation and to compare the information content of each measurement type to parameter estimations. It appears that the uncertainties related to three seal parameter estimations, namely the parameter related to the dynamics of seal formation, the modelled seal thickness and the initial bulk density, were larger than 50% of the parameter values, because of the low sensitivity of the model to them and their multiple correlations. In addition to seal hydraulic parameter estimation, bulk density profiles of the soil surface were measured after the rainfall simulations using the X-ray method. The exponential-decay shape assumed in the soil surface seal model was found to correctly reproduce the measured distribution of bulk density with depth. However, the measurements showed a less developed seal than that suggested by the bulk density profile estimated from rainfall experiments. Finally, bulk density measurements were used as given input parameters of the model. Setting the initial bulk density and its maximal change over time at the measured values greatly decreased the seal parameter uncertainties. The method proposed could be used to improve the experimental design used to quantify the seal's hydraulic properties using inverse techniques. © 2007 Elsevier B.V. All rights reserved.
Note:
Related Files :
computer simulation
drainage
rain
rainfall
Richards equation
sealing
X-ray
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.jhydrol.2007.04.018
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19256
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:27
Scientific Publication
Estimating hydraulic properties of rainfall-induced soil surface seals from infiltration experiments and X-ray bulk density measurements
341
Augeard, B., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Assouline, S., The institut of Soil, Water and Environmental Sciences, Volcani Center, P.O. Box 6, Bet-Dagan, 50250, Israel
Fonty, A., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Kao, C., UR Cemagref Hydrosystèmes et Bioprocédés, BP 44, 92163 Antony Cedex, France
Vauclin, M., Laboratoire d'Etude des Transferts en Hydrologie et Environnement (LTHE), UMR 5564 (CNRS, INPG, IRD, UJF), BP 53, 38041 Grenoble Cedex 9, France
Estimating hydraulic properties of rainfall-induced soil surface seals from infiltration experiments and X-ray bulk density measurements
Soil and surface seal hydraulic properties were determined from simulated rainfall experiments by the inverse method applied to the Richards equation. Measurements used for the estimation include the soil water pressure head versus time at two distances from the soil surface, the transient infiltration rate at the soil surface and the drainage rates at the bottom of the soil profile. Seal properties were evaluated using a model that simulates changes in the seal bulk density with respect to time and space. Uncertainties, correlations and sensitivities of the soil and seal parameters were quantified to evaluate the accuracy of the model estimation and to compare the information content of each measurement type to parameter estimations. It appears that the uncertainties related to three seal parameter estimations, namely the parameter related to the dynamics of seal formation, the modelled seal thickness and the initial bulk density, were larger than 50% of the parameter values, because of the low sensitivity of the model to them and their multiple correlations. In addition to seal hydraulic parameter estimation, bulk density profiles of the soil surface were measured after the rainfall simulations using the X-ray method. The exponential-decay shape assumed in the soil surface seal model was found to correctly reproduce the measured distribution of bulk density with depth. However, the measurements showed a less developed seal than that suggested by the bulk density profile estimated from rainfall experiments. Finally, bulk density measurements were used as given input parameters of the model. Setting the initial bulk density and its maximal change over time at the measured values greatly decreased the seal parameter uncertainties. The method proposed could be used to improve the experimental design used to quantify the seal's hydraulic properties using inverse techniques. © 2007 Elsevier B.V. All rights reserved.
Scientific Publication
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