QE453 : Assessing sustainability of Azghand aquifer in Khorasan Razavi province using a numerical model
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2019
Authors:
Hadi Omidifar [Author], Hadi Jafari[Supervisor]
Abstarct: Predicting water table fluctuations and changes in the volume of groundwater resources has a great importance in their efficient management. The Azghand aquifer stretches about 289 km2 between the cities of Torbat-Heydariyeh, Feyzabad and Kashmar along the east to west. About 66 percent of the aquifer's groundwater resources are used for agricultural purposes, 33 percent for urban and rural drinking and 1 percent for other uses (cattle, poultry, industry, greenhouses, etc.).Azghand aquifer has the most role in supplying the drinking water of Feyzabad, its subsidiary villages and also part of Torbat-Heydariyeh, which it shows the necessitates of further studies on this important aquifer. For this purpose, numerical aquifer model was developed to predict aquifer behavior in different scenarios andto manage this valuable aquifer using MODFLOW computer code in GMS 7.1 software. The calibration of the model is baxsed on the 12-month data of the 2015-2016 water-year and the nextwater-year statistics were used to validate it. Accordingly, the range of aquifer hydraulic conductivity in numerical model was estimated from 7 to 24 m/day, average storage coefficient of about 6 to 7%, precipitation diffusion coefficient of 10% and return water coefficient of about 20%. A calibrated and validated numerical model was used to predict aquifer behavior in different scenarios (continuation of current conditions, drilling new wells to supply drinking water and reducing harvest from agricultural wells). baxsed on the numerical model results, the continuation of the current trend without decreasing water harvesting conditions increases the water table drop. Increasing groundwater harvesting by drilling new drinking water wells will further reduce the stationary level and intensify the progression of less potential lines to the north of Zarmehr and Khoshdareh (located northeast of the aquifer). In the third scenario, the reduction of harvest from the current agricultural wells within the drinking water wells will not put more stress on the aquifer.
Keywords:
#Numerical model #Budget #MODFLOW #Azghand Link
Keeping place: Central Library of Shahrood University
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