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Three-Dimensional variably- saturated simulations of groundwater flow and salt water intrusion using a numerical model (Case study: Tavabe- Arsanjan, Fars province, Iran)

Publish Year: 1388
Type: Conference paper
Language: English
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ICWR01_199

Index date: 6 December 2009

Three-Dimensional variably- saturated simulations of groundwater flow and salt water intrusion using a numerical model (Case study: Tavabe- Arsanjan, Fars province, Iran) abstract

Tavabe-e-Arsanjan, Iran, is one of the oldest agricultural areas in the world and is suffering from the progressive salinization of basin groundwater due to crop irrigation activities as well as the progressive intrusion of salt water from the adjoining highly saline Tashk Lake. The objective of this study is to use a three-dimensional variably-saturated variable-density hydrologic model to investigate the progressive salinization of the regional groundwater flow system due to agricultural irrigation activities, as well as the continued encroachment of the highly saline saltwater intrusion front emanating from Tashk Lake into the aquifer. First, Inverse method is used to estimate the hydraulic conductivity, porosity and the fraction of precipitation which infiltrates as well as the fraction of irrigation water that recharges the water table. In the course of the numerical simulation of the salt water intrusion in the area, various aquifer parameters, including boundary condition, were identified with the model until satisfactory agreements between modeled and observed values of water level and chloride concentration were obtained. Comparison between observed and simulated values showed good agreement between the simulated and observed water table elevation. Overall, one could conclude that groundwater flow and the solute transport model performs satisfactorily with regards to results. More importantly, the model could be used to predict future changes in water levels and chloride concentrations of the groundwater when controlling of the salt water intrusion are taken into account. Several management scenarios were chosen to represent the likely range of effects that could be encountered at Tashk Lake, and provide some information about the behavior of the lake system and possible impacts under a variety of operating conditions.

Three-Dimensional variably- saturated simulations of groundwater flow and salt water intrusion using a numerical model (Case study: Tavabe- Arsanjan, Fars province, Iran) Keywords:

Three-Dimensional variably- saturated simulations of groundwater flow and salt water intrusion using a numerical model (Case study: Tavabe- Arsanjan, Fars province, Iran) authors

A. Rasoulzadeh

Dept. of Soil Science, College of Agriculture, University of Mohaghegh Ardabili, Ardabil, P.O. Box: ۱۷۹, Iran

S.A.A. Moosavi

Dept. of Water Engineering, College of Agriculture, Shiraz University, Shiraz, Iran

A.J.A Unger

Dept. of Earth Sciences, University of Waterloo, ۲۰۰ University Ave. West, Waterloo, Ontario, Canada N۲L ۳G۱

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