IMPACT OF RECLAMATION OF SODIC LAND ON GROUND WATER QUALITY

Abstract

A mathematical model using the relationship of rate of transfer of salt from immobile water to mobile water with the concentration difference between the two regions is developed to predict the salt concentration with time applying infiltration of water. Using Green and Ampt equation an expression is derived showing relationship between time and depth of saturation front in the root zone. This relationship is utilized in the mathematical model. A certain depth of water is applied on the surface of soil assuming it to be at field capacity and simulation is made. The result shows that after onset of infiltration the concentration in the mobile water is increasing and that in immobile water is decreasing. When left for ten days to take exchange, both are converging to a middle value of the initial concentration. Again applying the same depth of water, concentration in both regions are decreasing. Finally we get the concentration well within the permissible limit. This model is believed to be more efficient for prediction of the variation in salt cincentration with time from the onset of infiltration..