TY  - JOUR
AU  - Jitrapinate, Natthawit 
AU  - Sriboonlue, Vichai 
AU  - Srisuk, Kriengsak 
AU  - Hormdee, Dolrerdee 
PY  - 2011
TI  - Simplified Procedure for Unsaturated Flow Parameters
JF  - American Journal of Applied Sciences
VL  - 8
IS  - 6
DO  - 10.3844/ajassp.2011.635.643
UR  - https://thescipub.com/abstract/ajassp.2011.635.643
AB  - Problem statement: The unsaturated hydraulic conductivity K(θ) and Soil Water Characteristic Curve (SWCC) for saline soil or soil directly contacted with saline water are not permitted using several apparatus to determining. Approach: A simplified method to determine K(θ) and SWCC by using simple apparatus is presented. Using the proposed numerical model with the van Genuchten equations and inverse calculation for K (θ) and SWCC to produce the best fit of this model calculation to the experimental cumulative capillary flow in dry soil columns. These are found by an optimization procedure which adjusts the parameters of K(θ) and SWCC. In addition, the resulting SWCC from the model was used to evaluate the K(θ) for the Gardner equation. Results: Values of saturated hydraulic conductivity Ksat for the van Genuchten equations were lower than those based on the Gardner equation. The Ksat values of dense soil were nearly overall lower than loose soil. Conclusion: Good agreement (R2 value) was obtained in the SWCC and Ksat values from the experiment and those calculated from the van Genuchten and Gardner equations this suggests that the simplified method provides a useful means of determining unsaturated flow parameters.