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Modeling the dynamics of seal formation and its effect on infiltration as related to soil and rainfall characteristics
Year:
1997
Source of publication :
Water Resources Research
Authors :
Assouline, Shmuel
;
.
Volume :
33
Co-Authors:
Assouline, S., Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
Mualem, Y., Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
Facilitators :
From page:
1527
To page:
1536
(
Total pages:
10
)
Abstract:
The main physical aspects of soil surface seal formation caused by rainfall are modeled. The proposed model relates the surface sealing to the specific hydraulic and mechanical properties of the initially undisturbed soil as well as the physical characteristics of the rainfall applied, under given initial and boundary conditions defining the flow system. The soil disturbance resulting from the raindrop impacts is expressed in terms of an increase of the initial soil bulk density. The dynamics of seal formation at the soil surface are found to be related to the following variables: the rainfall intensity, the second moment of the drop-size density distribution, the maximal drop diameter, the compaction limit of the given soil, and its initial shear strength, which depends upon the initial soil bulk density and water content. Following Mualem and Assouline [1989], a nonuniform seal is considered, represented by an exponentially decreasing function of the bulk density with depth. The seal thickness is assumed to be dependent upon the rainfall rate. Its steady state value is assumed to be reached shortly after the beginning of rainfall so that it might be considered as constant during the stage of formation. A calibration procedure is presented on the basis of measured infiltration under scaling conditions. The results show that the proposed model addresses the main factors affecting soil sealing formation and is able to simulate the process of infiltration through scaling soils under saturated as well as unsaturated flow conditions.
Note:
Related Files :
Bulk density
HYDRAULICS
Infiltration
rainfall
Seal formation
sealing
Soil/Water Interaction
soil surface seal
Undisturbed soil
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28606
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:40
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Scientific Publication
Modeling the dynamics of seal formation and its effect on infiltration as related to soil and rainfall characteristics
33
Assouline, S., Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
Mualem, Y., Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil and Water Sci., Faculty of Agriculture, Hebrew University of Jerusalem, P. O. Box 12, Rehovot 76100, Israel
Modeling the dynamics of seal formation and its effect on infiltration as related to soil and rainfall characteristics
The main physical aspects of soil surface seal formation caused by rainfall are modeled. The proposed model relates the surface sealing to the specific hydraulic and mechanical properties of the initially undisturbed soil as well as the physical characteristics of the rainfall applied, under given initial and boundary conditions defining the flow system. The soil disturbance resulting from the raindrop impacts is expressed in terms of an increase of the initial soil bulk density. The dynamics of seal formation at the soil surface are found to be related to the following variables: the rainfall intensity, the second moment of the drop-size density distribution, the maximal drop diameter, the compaction limit of the given soil, and its initial shear strength, which depends upon the initial soil bulk density and water content. Following Mualem and Assouline [1989], a nonuniform seal is considered, represented by an exponentially decreasing function of the bulk density with depth. The seal thickness is assumed to be dependent upon the rainfall rate. Its steady state value is assumed to be reached shortly after the beginning of rainfall so that it might be considered as constant during the stage of formation. A calibration procedure is presented on the basis of measured infiltration under scaling conditions. The results show that the proposed model addresses the main factors affecting soil sealing formation and is able to simulate the process of infiltration through scaling soils under saturated as well as unsaturated flow conditions.
Scientific Publication
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