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פותח על ידי קלירמאש פתרונות בע"מ -
Wetting patterns and relative water-uptake rates from a ring-shaped water source - Abstract
Year:
2019
Authors :
גמליאל, אברהם
;
.
פרידמן, שמואל
;
.
Volume :
83
Co-Authors:
Facilitators :
From page:
48
To page:
57
(
Total pages:
10
)
Abstract:

A solution of the quasi-linear flow equation for steady and unsteady infiltration from a horizontal ring-shaped source with evaporation at the surface of a vertically heterogeneous soil is derived. A coupled source–sink approach enables analyzing the effects of geometrical source and sink attributes, potential evaporation rate and soil heterogeneity on wetting patterns and water-uptake rates. Ring emitters significantly smaller than the soil’s capillary length behave like a point source and substantially larger rings behave like a line source. For ring source radii comparable to the soil’s capillary length, water uptake depends on the ring radius and on the size of the root zone in a complex manner. At the stage of root development toward a ring emitter, water uptake is low, and it increases as the radius of the ring (torus)-shaped root system increases. Deepening a subsurface ring emitter decreases water uptake in the absence of evaporation from the soil surface and increases water uptake in the presence of evaporation. It is suggested that the evaluated relative water-uptake rate be used as a design criterion for determining the desired radius and depth of the ring emitter with respect to root-zone geometry, soil properties and atmospheric evaporation demand

Note:
Related Files :
Potential evaporation
Root development
soil heterogeneity
Soils
Source and sink
Water uptake rates
Wetting
עוד תגיות
תוכן קשור
More details
DOI :
10.2136/sssaj2018.06.0212
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
תקציר
;
.
Language:
אנגלית
Editors' remarks:
ID:
39513
Last updated date:
02/03/2022 17:27
Creation date:
12/03/2019 11:30
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Scientific Publication
Wetting patterns and relative water-uptake rates from a ring-shaped water source - Abstract
83
Wetting patterns and relative water-uptake rates from a ring-shaped water source

A solution of the quasi-linear flow equation for steady and unsteady infiltration from a horizontal ring-shaped source with evaporation at the surface of a vertically heterogeneous soil is derived. A coupled source–sink approach enables analyzing the effects of geometrical source and sink attributes, potential evaporation rate and soil heterogeneity on wetting patterns and water-uptake rates. Ring emitters significantly smaller than the soil’s capillary length behave like a point source and substantially larger rings behave like a line source. For ring source radii comparable to the soil’s capillary length, water uptake depends on the ring radius and on the size of the root zone in a complex manner. At the stage of root development toward a ring emitter, water uptake is low, and it increases as the radius of the ring (torus)-shaped root system increases. Deepening a subsurface ring emitter decreases water uptake in the absence of evaporation from the soil surface and increases water uptake in the presence of evaporation. It is suggested that the evaluated relative water-uptake rate be used as a design criterion for determining the desired radius and depth of the ring emitter with respect to root-zone geometry, soil properties and atmospheric evaporation demand

Scientific Publication
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