Simulation of Br concentration in soil columns by HYDRUS-ID model

摘要

Water and contaminants moving through the vadose zone are often subject to a large number of simultaneous physical and chemical nonequilibrium processes. Modification of the transport of one component is difficult, time consuming and expensive, therefore it is important to develop methods to simulate this movement. In the present study our purpose was to investigate bromide concentrations in soil columns, Br simulations by the HYDRUS-ID model and study the efficiency of this model in estimating concentrations of Br. For this, we used sandy loam and loamy sand textures, 3 Br doses (10, 20 and 30 mg/kg soil) were added to columns under saturated conditions. After leaching, samples were taken at every 2 cm from 0-12 cm depth; at every 4 cm from 12-20 cm depth; and at every 5 cm from 20-25 cm depth. Br concentration was measured using a Br selective electrode. The result showed that this model proved a suitable estimation of Br concentration with depth and thus can be use for prediction of Br diffusionin these soils.