Abstract
Problem statement: Iran is an arid country and only small percent of its water demand is met by rainfall. At present, about 55% of Iran's water being supplied by aquifers and 45% from surface water. Population growth, joint with economic development and rapid growth in industry and farming, has caused a vast increase in demand for water in Iran. But the slow recharging aquifers have not been able to cope with new condition. Approach: In this context, the importance of control and optimum utilization of groundwater has been realized by Iranian and groundwater models because of their high effectiveness and less expenses than other methods have been developed and us end by hydro geologists as a water source management tool. Results: For this purpose, the quantitative model of the groundwater of Firozabad plain, with area of 240 km 2 , which is located 100 km distant from the southwest of Shiraz, is prepared. MODFLOW, GMS, groundwater modeling system, was used to build a groundwater flow model to simulate the behavior of the flow system under different stresses for one year period (2006-2007) under unsteady condition. First, a conceptual model was set up using simple GIS tools. Conclusion: The numerical model was generated and, transient data from observation wells was used to calibrate the model. Following this, the transient model was validated by using observation data for the period 2007-2008 .Then; the completed MODFLOW model was ready for simulation runs. The results for the various scenarios including predicting the status of water level in next 5 years, drilling new production wells and predicting the status of groundwater under drought conditions was analyzed in Firozabad plain.
Highlights
With regard to current conditions and research funds limitations, recognizing a groundwater aquifer system behavior and conducting a series of long term researches on any specific region might seem impossible
The purpose of mathematical model of a groundwater aquifer is to simulate the real conditions of an aquifer using mathematical relations
A model is a schema of reality and in connection with an existent system is based on different preview and assumption
Summary
The effects of discharge and recharge in different circumstances can be Executive sectors have initiated widespread actions in order to developing basic studies, generating observation and exploration wells in recent years which can be considered as a start point for water resources preservation. The purpose of mathematical model of a groundwater aquifer is to simulate the real conditions of an aquifer using mathematical relations. If the simulation process of an aquifer is carried out with success, evaluating aquifer predicted. In other words hydraulic and hydro geologic parameters used in a model are an estimation of real parameters in the field. A model renders a general view of an aquifer and its conditions enabling the hydro-geologist or model maker to predict the model’s response to probable different stresses as well as making appropriate decision. GMS employs the latest version of MODFLOW from the year 2000
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