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Showing 4 results for akbari
Reducing Uncertainty in Hydrodynamic Parameter Estimation of Heterogeneous Alluvial Aquifers through AHP-Based Integration of Pumping Tests, Geophysics, and Grain-Size Data: Insights from the Golgir Plain, Southwest Iran
Ms. Soroor Mazrae Asl, Dr. Amir Saberinasr, Mr. Farzad Akbari, Mr. Babak Biglari,
Volume 0, Issue 0 (Accepted Articles 2025)
Abstract
Accurate estimation of hydrodynamic parameters in heterogeneous alluvial aquifers remains a major challenge in sustainable groundwater management, as different methods often yield inconsistent results across spatial scales. In this study, hydraulic conductivity, storage coefficient, and specific yield were estimated using pumping tests, geophysical surveys, and grain-size analysis. The results were integrated through a systematic framework based on the Analytical Hierarchy Process (AHP). Uncertainty was quantitatively assessed using the coefficient of variation (CV). Pumping test results indicated that hydraulic conductivity varies within a narrow range of 0.416–0.524 m/day, with a mean value of 0.475 m/day and a CV of approximately 8%, reflecting the high reliability and stability of this method. In contrast, the geophysical approach yielded a mean hydraulic conductivity of about 3.9 m/day with a CV of nearly 41%, highlighting the effects of spatial heterogeneity and uncertainties inherent in indirect estimation techniques. Grain-size analysis exhibited the highest variability, with hydraulic conductivity ranging from approximately 0.7 to 8 m/day and a CV exceeding 50%, indicating strong sensitivity to local-scale sedimentary characteristics. Integration of the three methods using AHP, assigning higher weight to pumping tests, moderate weight to grain-size analysis, and lower weight to geophysical data, effectively reduced method-dependent bias and produced spatially and physically consistent hydrodynamic parameter maps. The highest hydraulic conductivity and specific yield values were identified in the eastern and northeastern parts of the plain, while the lowest values occurred in the western and northwestern areas. The final integrated results indicate hydraulic conductivity and specific yield ranges of 0.49–1.01 m/day and 0.0039–0.045, respectively. The proposed integrative approach provides a practical and transferable framework for uncertainty management and informed decision-making in heterogeneous alluvial aquifers, particularly in arid and semi-arid regions.

Predicting of TBM penetration rate using the artificial neural networks (case study- Tabriz subway)
, Gholam Lashkaripour, M Akbari,
Volume 5, Issue 2 (4-2012)
Abstract
Tunnel boring machines (TBM) are widely used in excavating urban tunnels. These kinds of machines have different types based on supporting faces and tunnel walls. One type of these machines, is the Earth Pressure Balance (EPB) type that was used in excavating the Line 1 Tunnel of Tabriz Metro. Different parameters such as geological conditions, rock mass properties, dip and machine specifications affect the efficiency of the machine. One method of predicting the efficiency of these machines is to estimate their penetration rates. In this study the value of TBM penetration rates are predicted by an artificial neural network. Predicting of this parameter is so effective for conducting in high risk regions by understanding the time of facing to these regions. The main result of this study is to forecast the penetration rate with an acceptable accuracy and to determine the effective parameters through sensitivity analysis measured by an artificial neural network.
Hydrogeological and hydrogeochemical investigation of Vorskharan karsitic spring in Firoozkooh county
Hossein Ebrahimi, Farzad Akbari, Soroor Mazrae Asl, Babak Biglari,
Volume 17, Issue 4 (12-2023)
Abstract
The Vorskharan karst spring with a catchment area of 50 square kilometers and an average discharge of about 1.35 m2/s is one of the most important springs in the city of Firouzkouh. In order to asses the hydrogeological and hydrogeochemical charachteristics of the spring, the physical and chemical properties of the spring water were measured and analyzed for several months. The results showed that the recession curve of the spring has a slope and the value of its coefficient is about 0.003. The low coefficienof the discharge variation t, electrical conductivity and major ions, as well as the single slope of the spring’s recession curve , are mainly due to the elongated shape of the aquifer and the long-term presence of snow in the catchment basin of the spring. Considering the relatively high water level of the spring and the existence of a sinkhole and a polje in the spring’s catchment area, as well as the coefficient of small changes in the physical and chemical parameters of the spring, it can be said that the dominant flow system in the aquifer which recharges Vorskharan spring,is  conduit-diffusive. According to the field studies and the evaluation of the percentage of soil cover, the development of dissolved spaces and other morphological effects of karst, the percentage of annual recharge in the catchment area was estimated  at 56%. With the amount of precipitation, the percentage of annual recharge, the annual recharge volume of the preliminary water catchment basin equal to 19.2 MCM and the annual discharge volume of the spring through the annual hydrograph of the spring was calculated to be equal to 20.1 MCM. It was also observed that the type of water is Ca-HCO3, and the lithology of the aquifer is calcareous and dolomite.

Comparison of hydrodynamic coefficients of Dalon- Meydavood plain by grain size analysis, geophysics and pumping test methods
Miss Sooror Mazraeasl, Mr Farzad Akbari, Ms Elahe Iraniasl, Miss Leila Hosseini Shafei,
Volume 18, Issue 1 (5-2024)
Abstract
Groundwater is one of the main sources of water supply for agriculture, drinking and industry in Iran, especially in areas with arid and semi-arid climates. Therefore, due to the high importance of groundwater resources, it is necessary to know the hydrodynamic parameters in order to determine the natural flow of water and manage the optimal utilization of groundwater resources. Considering the role of the Daloon-Meydavood aquifer in providing part of the water needed in the study area, especially for agricultural purposes, the hydrodynamic parameters of this aquifer were estimated using the methods of grain size analysis, geophysics and pumping test. The parameters were calculated by all three methods and validated using the flow rate of the exploitation wells. In all three methods, the hydrodynamic parameters (Hydraulic conductivity, Specific yeild, transmissivity coefficient) are the highest in the north and northeast and the lowest in the south and northwest. The results showed that 2 methods including  grain size analysisand pumping test had the most similarity with the discharge map of the exploitationwells.
 

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