Effects of heterogeneous soil-water diffusivity on vegetation pattern formation

2014 ◽  
Vol 50 (7) ◽  
pp. 5743-5758 ◽  
Author(s):  
H. Yizhaq ◽  
S. Sela ◽  
T. Svoray ◽  
S. Assouline ◽  
G. Bel
Keyword(s):  
Pattern Formation ◽  
Soil Water ◽  
Vegetation Pattern ◽  
Water Diffusivity ◽  
Heterogeneous Soil

scholarly journals A fast–slow model of banded vegetation pattern formation in drylands

2020 ◽  
Vol 410 ◽  
pp. 132534 ◽  
Author(s):  
Punit Gandhi ◽  
Sara Bonetti ◽  
Sarah Iams ◽  
Amilcare Porporato ◽  
Mary Silber
Keyword(s):  
Pattern Formation ◽  
Vegetation Pattern ◽  
Banded Vegetation

Determination of soil water hydraulic parameters from infiltration data

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yan Gao ◽  
Kai Chang ◽  
Xuguang Xing ◽  
Jiaping Liang ◽  
Nian He ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Test Method ◽  
Water Retention Curve ◽  
Absorption Method ◽  
Retention Curve ◽  
Content Type ◽  
One Dimensional ◽  
Water Diffusivity

PurposeTraditional laboratory measurements of soil water diffusivity (D) and soil water retention curve (SWRC) are always time-consuming and labor-intensive. Therefore, this paper aims to present a simple and robust test method for determining D and SWRC without reducing accuracy.Design/methodology/approachIn this study, a D model of unsaturated soil was established based on Gardner–Russo model and then a combination of Gardner–Russo model with one-dimensional horizontal absorption method to obtain n and a parameters of Gardner–Russo model. One-dimensional horizontal absorption experiments on loam, silt loam and sandy clay loam were conducted to obtain the relationships between measured infiltration rate and cumulative infiltration with wetting front distance. Based on the obtained relationships, the measured infiltration data from the one-dimensional horizontal absorption tests were used to calculate n and a parameters and further constructing D and SWRC.FindingsBoth the calculated D and SWRC inversed from the infiltration data were in good agreement with the measured ones that obtained from the traditional horizontal absorption method and the centrifuge method, respectively. Error analysis indicated that only the infiltration data are enough to reliably synchronously determine D and SWRC.Originality/valueA simple and robust method is proposed for synchronous determination of soil water diffusivity and water retention curve.

Uptake of water from a Kandosol subsoil: I. Determination of soil water diffusivity

2012 ◽  
Vol 368 (1-2) ◽  
pp. 483-492 ◽  
Author(s):  
David M. Deery ◽  
John B. Passioura ◽  
Jason R. Condon ◽  
Asitha Katupitiya
Keyword(s):  
Soil Water ◽  
Water Diffusivity

Soil Water Diffusivity Determination by a Modified One-Step Outflow Method

1990 ◽  
Vol 54 (4) ◽  
pp. 1184-1186 ◽  
Author(s):  
S. Mu'Azu ◽  
J. Skopp ◽  
D. Swartzendruber
Keyword(s):  
Soil Water ◽  
Water Diffusivity ◽  
One Step

A note on the methods for determining soil water diffusivity

Soil Research ◽  
1982 ◽  
Vol 20 (1) ◽  
pp. 61
Author(s):  
HS Acharya
Keyword(s):  
Quadratic Programming ◽  
Soil Water ◽  
Water Distribution ◽  
Soil Column ◽  
Experimental Methods ◽  
Soil Columns ◽  
Method Of Calculation ◽  
Water Diffusivity ◽  
Horizontal Infiltration

In experimental methods for determination of soil water diffusivity using the water distribution from horizontal infiltration into a soil column, hand smoothing of the experimentally obtained distribution introduces uncertainties in the calculations. A method of calculation involving techniques of quadratic programming has been used to minimize the possible errors caused by inhomogeneous packing of the horizontal soil columns. Examples are given to illustrate the method of calculations.

Capillary Conductivity and Soil Water Diffusivity Values from Vertical Soil Columns 1

1968 ◽  
Vol 60 (6) ◽  
pp. 605-610 ◽  
Author(s):  
W. J. Flocker ◽  
M. Yamaguchi ◽  
D. R. Nielsen
Keyword(s):  
Soil Water ◽  
Soil Columns ◽  
Water Diffusivity
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