NUMERICAL INVESTIGATION OF CONTAMINANT TRANSPORT IN IRANSHAHR PLAIN AQUIFER, IRAN_

摘要

Groundwater is the major source of water supply for most uses in Iran. Iranshahr plain is located in the Sistan and Baluchestan province, in the southeast of Iran and the Jazmurian depression. The Iranshahr aquifer consists of an unconfined layer. Two numerical models have been used to identify a suitable method to assist in the characterization of TDS movement in the aquifer. The groundwater flow model is made by studying the hydro-geological aspects of the Iranshahr plain using the results of the pumping test, geological logs of the observation and exploration wells, geo-electrical studies, and field observations. Steady state condition has been considered in Nov. 2008 because of low fluctuation in groundwater level in this period. Unsteady state condition is considered for 1 year (Nov. 2008 to Nov. 2009), and also verification accomplished for the period of Nov. 2007 to Nov. 2008. Then, the contaminant transport model is made using TDS (Total Dissolved Solids) concentration data in Iranshahr plain aquifer. The steady and unsteady state condition periods have been considered as in the groundwater flow model. Finally, the model was verified for a 1-year (12 months) period of Nov. 2008 to Nov. 2009, and accomplished good results. This model is a suitable tool for management of groundwater system and would also be effective when applied in other countries.