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Aliasghar Azma
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

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Journal article
Published: 29 March 2021 in Sustainability
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In arid and semi-arid lands like Iran water is scarce, and not all the wastewater can be treated. Hence, groundwater remains the primary and the principal source of water supply for human consumption. Therefore, this study attempted to spatially assess the groundwater potential in an aquifer in a semi-arid region of Iran using geographic information systems (GIS)-based statistical modeling. To this end, 75 agricultural wells across the Marvdasht Plain were sampled, and the water samples’ electrical conductivity (EC) was measured. To model the groundwater quality, multiple linear regression (MLR) and principal component regression (PCR) coupled with elven environmental parameters (soil-topographical parameters) were employed. The results showed that that soil EC (SEC) with Beta = 0.78 was selected as the most influential factor affecting groundwater EC (GEC). CaCO3 of soil samples and length-steepness (LS factor) were the second and third effective parameters. SEC with r = 0.89 and CaCO3 with r = 0.79 and LS factor with r = 0.69 were also characterized for PC1. According to performance criteria, the MLR model with R2 = 0.94, root mean square error (RMSE) = 450 µScm−1 and mean error (ME) = 125 µScm−1 provided better results in predicting the GEC. The GEC map indicated that 16% of the Marvdasht groundwater was not suitable for agriculture. It was concluded that GIS, combined with statistical methods, could predict groundwater quality in the semi-arid regions.

ACS Style

Aliasghar Azma; Esmaeil Narreie; Abouzar Shojaaddini; Nima Kianfar; Ramin Kiyanfar; Seyed Seyed Alizadeh; Afshin Davarpanah. Statistical Modeling for Spatial Groundwater Potential Map Based on GIS Technique. Sustainability 2021, 13, 3788 .

AMA Style

Aliasghar Azma, Esmaeil Narreie, Abouzar Shojaaddini, Nima Kianfar, Ramin Kiyanfar, Seyed Seyed Alizadeh, Afshin Davarpanah. Statistical Modeling for Spatial Groundwater Potential Map Based on GIS Technique. Sustainability. 2021; 13 (7):3788.

Chicago/Turabian Style

Aliasghar Azma; Esmaeil Narreie; Abouzar Shojaaddini; Nima Kianfar; Ramin Kiyanfar; Seyed Seyed Alizadeh; Afshin Davarpanah. 2021. "Statistical Modeling for Spatial Groundwater Potential Map Based on GIS Technique." Sustainability 13, no. 7: 3788.

Journal article
Published: 24 October 2020 in Processes
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Channel confluences happen commonly in water transport networks and natural rivers. Utilizing a 3D CFD code, a series of numerical simulations were performed using a large eddy simulation turbulence model to investigate the effect of the variations in tributary channel width and the transverse geometrical shape of the main channel on the flow parameters and vertical structure in a T-shape confluence. The code was calibrated using the experimental data from the literature. Flow parameters were considered in ratios of tributary width to the main channel width in trapezoidal and rectangular channels. Results indicate that decreasing the width ratio of the tributary channel to the main channel significantly affects the flow structure in the confluence. Generally, it increases the width and length of the main recirculation zone. It also increases the maximum velocity near the bed, especially in cases with a trapezoidal shape. Besides, it highly affects the structure and formation of the recirculation zone in trapezoidal channels.

ACS Style

Aliasghar Azma; Yongxiang Zhang. Tributary Channel Width Effect on the Flow Behavior in Trapezoidal and Rectangular Channel Confluences. Processes 2020, 8, 1344 .

AMA Style

Aliasghar Azma, Yongxiang Zhang. Tributary Channel Width Effect on the Flow Behavior in Trapezoidal and Rectangular Channel Confluences. Processes. 2020; 8 (11):1344.

Chicago/Turabian Style

Aliasghar Azma; Yongxiang Zhang. 2020. "Tributary Channel Width Effect on the Flow Behavior in Trapezoidal and Rectangular Channel Confluences." Processes 8, no. 11: 1344.

Journal article
Published: 21 May 2020 in Processes
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Channel confluences are of the common structures in fluid transport channels. In this study, a series of numerical simulations were performed, utilizing a 3D code to investigate the reaction of the flow parameters and vortical structure to the variations in flow discharge and its Froude number from both main channel and tributary branch in a T-shape junction. The code was calibrated with the experimental data. Parameters, including the velocity, the turbulence energy, stream surface profile, head losses, and the transverse flow motions, were considered in different situations. It was concluded that increasing the ratio of discharge of flow from side-channel to the main channel (Q*) increased the area and power of the recirculation zone, as well as the width of separation plate downstream of the confluence, while it reduced the area of the stagnation zone (or the wake vortex) within the side-channel. It was also indicated that increasing the discharge ratio from side-channel resulted in an increase in the upstream water level in the main channels, which was dependent on the upstream discharge.

ACS Style

Aliasghar Azma; Yongxiang Zhang. The Effect of Variations of Flow from Tributary Channel on the Flow Behavior in a T-Shape Confluence. Processes 2020, 8, 614 .

AMA Style

Aliasghar Azma, Yongxiang Zhang. The Effect of Variations of Flow from Tributary Channel on the Flow Behavior in a T-Shape Confluence. Processes. 2020; 8 (5):614.

Chicago/Turabian Style

Aliasghar Azma; Yongxiang Zhang. 2020. "The Effect of Variations of Flow from Tributary Channel on the Flow Behavior in a T-Shape Confluence." Processes 8, no. 5: 614.