Fredlund and Xing (1994) Fit

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SVSoils

 

 

The Fredlund and Xing dialog contains the equation parameters necessary to mathematically represent the SWCC curve with the methodology published by Fredlund and Xing (1994). A description of the theory can be found in the SVSOILS Theory Manual.

 

af: The af field refers to a fitting parameter in the Fredlund and Xing (1994) equation. The af parameter is indirectly related to the air-entry value of the soil.

 

nf: The nf field refers to another fitting parameter in the Fredlund and Xing (1994) equation.

 

mf: The mf field refers to another fitting parameter in the Fredlund and Xing (1994) equation.

 

hr: The hr field refers to the constant parameter in the Fredlund and Xing (1994) equation corresponding to the residual suction (kPa).

 

Fit: The Fit indicates whether the experimental data needs to be fit with the Fredlund and Xing (1994) equation.

 

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

 

Residual WC: The Residual WC field refers to the calculated residual gravimetric water content from the Fredlund and Xing (1994) equation (kPa).

 

Wilting Point: The wilting Point is the water content corresponding to the wilting point suction for most plants (i.e., in the order of 1500 kPa).

 

AEV: The AEV field shows the air-entry value calculated from the Fredlund and Xing (1994) 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 Fredlund and Xing (1994) fit of the soil-water characteristic curve (unitless).

 

Graph:

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