van Genuchten (1980) Fit

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SVSoils

 

 

The van Genuchten dialog contains the equation parameters necessary to mathematically represent the SWCC curve with the equation published by van Genuchten (1980). A description of the theory can found in the SVSOILS Theory Manual.

 

avg (a): The avg field refers to a fitting parameter in the van Genuchten (1980) equation. The avg parameter is indirectly related to the air-entry value of the soil.

 

nvg: The nvg field refers to another fitting parameter in the van Genuchten (1980) equation. The nvg parameter is related to the steepness of the SWCC.

 

mvg: The mvg field refers to another fitting parameter in the van Genuchten (1980) equation. The mvg parameter is primarily related to the curvature at the breaks along the SWCC.

 

Fit: The Fit indicates whether the experimental data has been fit with van Genuchten (1980) equation.

 

Error: The Error field shows the difference between the fitted data and the laboratory values in terms of R2.

 

Residual WC, wr: The Residual WC refers to the calculated residual gravimetric water content from the van Genuchten (1980) equation.

 

AEV: The AEV is the air-entry value calculated using the van Genuchten (1980) fit of the soil-water characteristic curve (kPa)

 

Max. Slope: The Max. Slope refers to the maximum slope (on a semi-log plot) of the van Genuchten fit (1980) along the soil-water characteristic curve (unitless).

 

Graph:

 Click the graph button at the bottom of the dialog to display a graph.