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פותח על ידי קלירמאש פתרונות בע"מ -
Infiltration during soil sealing: The effect of areal heterogeneity of soil hydraulic properties
Year:
2002
Source of publication :
Water Resources Research
Authors :
אסולין, שמואל
;
.
Volume :
38
Co-Authors:
Assouline, S., Department of Environmental Physics, Inst. of Soil, Water/Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Environmental Physics, Inst. of Soil, Water/Environ. Sci., Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Mualem, Y., Seagram Ctr. for Soil/Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil/Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, 76100 Rehovot, Israel
Facilitators :
From page:
221
To page:
229
(
Total pages:
9
)
Abstract:
The Combined effects of soil surface sealing and areal heterogeneity of the soil hydraulic properties on the mean infiltration curve are studied here for the first time. Seal formation during rainfall is simulated according to the dynamic model of Assouline and Mualem [1997]. Areal heterogeneity is represented by lognormal distribution of the saturated hydraulic conductivity of the initially undisturbed soil and by related distributions of the other soil parameters. The mean infiltration curve of the heterogeneous field is evaluated presuming that horizontal fluxes are negligible. It is found that when soil surface sealing is taken into account in a heterogeneous field, the ponding time is only slightly affected. However, significantly more runoff is produced compared to nonsealing field (mulched), with the relative area contributing to surface runoff being increased from 65 to 95%. The relative effect of field heterogeneity on the infiltration curve increases for higher rainfall intensity. The formation of soil surface seal apparently reduces the effect of the field areal variability on the steady infiltration rate. The infiltration rate after 60 min of rainfall distributes lognormally under sealing conditions, while it distributes normally in the case of the unsealed soil. The final infiltration rate resulting from the assumption of a sealed uniform field is underestimated compared to sealed heterogeneous field, with the relative effect being larger for a loam soil (-51%) than for a sandy loam soil (-26%). Also, the approximation that the infiltration curve is a unique function of cumulative rainfall independent of rainfall intensity is not valid in a sealing heterogeneous field, and its application in such a case would be more erroneous than in uniform fields. On the other hand, one may disregard the variability of all soil parameters, except the hydraulic conductivity, when calculating infiltration.
Note:
Related Files :
Fluxes
heterogeneity
modeling
rain
sealing
Sealing (closing)
Soil crust
Soils
Soil sealing
Variability
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23726
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:02
Scientific Publication
Infiltration during soil sealing: The effect of areal heterogeneity of soil hydraulic properties
38
Assouline, S., Department of Environmental Physics, Inst. of Soil, Water/Environ. Sci., Volcani Center, Bet Dagan, Israel, Department of Environmental Physics, Inst. of Soil, Water/Environ. Sci., Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Mualem, Y., Seagram Ctr. for Soil/Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot, Israel, Seagram Ctr. for Soil/Water Sciences, Faculty of Agriculture, Hebrew University of Jerusalem, 76100 Rehovot, Israel
Infiltration during soil sealing: The effect of areal heterogeneity of soil hydraulic properties
The Combined effects of soil surface sealing and areal heterogeneity of the soil hydraulic properties on the mean infiltration curve are studied here for the first time. Seal formation during rainfall is simulated according to the dynamic model of Assouline and Mualem [1997]. Areal heterogeneity is represented by lognormal distribution of the saturated hydraulic conductivity of the initially undisturbed soil and by related distributions of the other soil parameters. The mean infiltration curve of the heterogeneous field is evaluated presuming that horizontal fluxes are negligible. It is found that when soil surface sealing is taken into account in a heterogeneous field, the ponding time is only slightly affected. However, significantly more runoff is produced compared to nonsealing field (mulched), with the relative area contributing to surface runoff being increased from 65 to 95%. The relative effect of field heterogeneity on the infiltration curve increases for higher rainfall intensity. The formation of soil surface seal apparently reduces the effect of the field areal variability on the steady infiltration rate. The infiltration rate after 60 min of rainfall distributes lognormally under sealing conditions, while it distributes normally in the case of the unsealed soil. The final infiltration rate resulting from the assumption of a sealed uniform field is underestimated compared to sealed heterogeneous field, with the relative effect being larger for a loam soil (-51%) than for a sandy loam soil (-26%). Also, the approximation that the infiltration curve is a unique function of cumulative rainfall independent of rainfall intensity is not valid in a sealing heterogeneous field, and its application in such a case would be more erroneous than in uniform fields. On the other hand, one may disregard the variability of all soil parameters, except the hydraulic conductivity, when calculating infiltration.
Scientific Publication
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