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Showing 3 results for Ijani
Investigating the groundwater quality of Evan Plain aquifer in Khuzestan province with emphasis on nitrate concentration
Dr Seyed Yahya Mirzaee, Phd Student Zahra Chaghazardi, Dr Manouchehr Chitsazan, Dr Farshad Alijani,
Volume 17, Issue 1 (Spring 2023 2023)
Abstract
The Evan plain is located in the Khuzestan province in the southwest of Andimshek city. Groundwater is one of the available water resources for irrigation, drinking, and industry in this region. Due to the importance of examining the ground water quality of the Evan plain, hydrochemical parameters and nitrate pollution have been evaluated. Nitrate is one of the most widespread pollutants of ground water in the world. However, few studies have been conducted on this pollutant in the Evan plain. Therefore, to assess the quality of ground water in this area with emphasis on nitrate pollution, sampling was carried out in September of the water year (1400-1401) from 22 wells in this plain. During the sampling, field parameters (temperature, pH, EC), concentrations of major elements (Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO32-, CO32-), and nitrate were measured. The results of the factor analysis demonstrated three influencing factors, namely EC, Na+, K+, Mg2+, Ca2+, Cl-, SO42-  (as the first factor), pH and Hco32- (as the second factor), and NO3- (as the third factor), with a total of 89.72% having the most changes in the Evan plain aquifer. The dominant water type in the Evan plain is sulfate-calcite. Hierarchical clustering analysis shows the three clusters for the regionalization of nitrate data. In general, the changes in nitrate ion concentration in the groundwater of the Evan plain are affected by the size of the soil particles, the depth of the groundwater, and the utilization of chemical fertilizers in the area.
 

Effect of Tunnel Excavation of Tehran Metro Line 6 on Groundwater and Ali Spring in Shahr-e-Rey
Professor Hamidreza Nassery, Koosha Tamimi, Dr Farshad Alijani, Dr Sadegh Tarigh Azali,
Volume 17, Issue 3 (Autumn 2023)
Abstract
The development of underground transportation activities in cities, such as tunnel boring, may exert short-term or long-term effects on the groundwater and springs of such areas. The construction of the tunnel of Tehran Metro Line 6 (TML6) through alluvium and carbonate rocks of Ali Spring has aroused concern due to the caused fluctuations in discharge and temporary dryness of the spring. The hydrochemical properties of the groundwater and catchment area were investigated to find a connection between the aquifers around the spring and determine the major aquifer feeding it. The estimated volume of water penetrated to the tunnel and the most greatly affected area by the water leakage into the tunnel was determined using analytical methods of water leakage into the tunnel and the DHI method. The statistics for precipitation with the changes in the discharge of the spring before and after the excavation of the metro tunnel were compared to evaluate the changes in the discharge of the spring with the precipitation in the area. The results showed that the metro tunnel excavation has dramatically affected the hydrological system of the area and discharge of the Ali Spring. Moreover, continuing the extraction may produce adverse effects on the discharge of other springs and wells and alter the flow system of the area temporarily or forever.

Examining the impact of Flat-Joint and Linear Parallel Bond behavioral models on Aghajari sandstone failure mechanisms in PFC2D simulations
Eng. Mohammad Ijani, Dr. Ebrahim Rahimi, Dr. Vahab Sarfarazi, Dr. Ali Faghih,
Volume 18, Issue 4 (Winter 2024)
Abstract
Numerical modeling serves as a crucial tool in engineering analyses, particularly within the fields of geoscience and geotechnical engineering. The software PFC2D stands out in this domain, employing the Discrete Element Method (DEM) to simulate processes related to engineering geology and geotechnical assessments. This study focuses on the analysis and comparison of two common contact models: the Flat Joint Model (FJM) and the Linear Parallel Bond Model (LPBM). The Unconfined Compressive Strength (UCS) test is selected as a benchmark for calibrating and validating the PFC models. Sandstone samples for this research are sourced from the Aghajari formation located on the southern limb of the Madar anticline. The findings show that both contact models have high ability in simulating UCS in the calibration process. Since this test is primarily utilized to calibrate the failure point (σc) and Young's modulus, the output values for both models are nearly identical. However, the post-failure behavior in the stress-strain curves differs between the models, with the FJM demonstrating a more brittle response compared to the LPBM. The FJM model's ability to simulate rough surfaces and material discontinuities allows for the representation of tensile crack occurrences.
 

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