Introducing Developed KDW-VG Model and Its Performance Iinvestigation to Numerical Simulation of Preferential Water Flow in Soil

Document Type : Original Article

Authors

1 PhD student of Irrigation and Drainage Engineering, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz,., Ahvaz., Iran

2 - Professor at Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz., Ahvaz., Iran

3 Professor at Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz., Ahvaz., Iran

4 Faculty of Agricultural Sciences, Department of Water Engineering, University of Guilan., Rasht., Iran

Abstract

Rapid preferential water flow occurs in soil macropores such as underground channels formed by worm activity and root plants growth. For process predicting and describing of these types of water flow in soil, Di Pietro et al., (2003) developed and proposed kinematic–dispersive wave (KDW) model. They proposed this model by adding dispersive term to kinematic wave model which is strictly convective and was presented by German (1985). The fundamental assumption of this model is that the flux is exclusively a function of the mobile water content but in kinematic–dispersive wave model with its aditional dispersive term, it is assumed that the flux is some non-linear function of the mobile water content and its first time derivative. The first term of this assumption is a power function where the flux is depended to mobile water content .This equation is just a mathematic equation and has not the strong physical meaning. In this research, this power function is substituted by the shape of van Genuchten equation which has an acceptable physical meaning and the kinematic dispersive wave- van Genuchten (KDW-VG) is introduced for the first time. At first the model coefficients were optimized using particle swarm optimization (PSO) method and after that the model was validated by experimental observation of hydrograph of rainfall which was passed through the preferential routes of physical model and was recorded from the bottem of soil column. For creating the preferential pathways in the soil profile, a soil column of coarse sand with diameter of 1.4 cm was embedded in the center of a soil column with diameter of 160 mm and height of 300 mm.The results showed that the numerical model has very good agreement with the experimental observations and the RMSE amount between observations and the model prediction was lesser compared with last researches.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 9, Issue 6 - Serial Number 54
March and April 2016
Pages 960-972

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