Hydrogeological Flow Model at Abu Quta Area, Gezira State, Sudan
[1]
Adil Elkrail, Department of Hydrogeology, Faculty of Petroleum & Minerals, Al Neelain University, Khartoum, Sudan.
[2]
Rasha Omer, Ministry of Irrigation, Department of Non-Nile Water Corporation, Khartoum, Sudan.
The main objectives of the study are to design suitable conceptual model for numerical flow simulation, determine the aquifer potentiality, visualize general groundwater flow direction and determine the main source of recharge. Global Positioning System (GPS) and ArcGIS software were used for well locations and conceptual model construction. Visual MODFLOW code was selected to simulate the model for two years. Five layers, 80 columns and 80 rows were performed for model geometry in the study area for two main aquifers in porous medium. Good fitness between calculated and observed head was obtained using the Root Mean Squared Error (RMS), Normalized (RMS%) and mass balance percent discrepancy. The measured equipotential lines are consistent to observed equipotential lines in shape and configuration. Groundwater discharge within model domain through thirty four pumping wells in addition lateral outflow represents only 2.3% of total inflow during the simulation period with maximum drawdown of 1.3 m. The river leakage represents 58.0% of total inflow indicating the main source of recharge. Model results show a good agreement between model calculations and measurements and demonstrate the capability of the model to reflect the internal groundwater dynamics. The model proves to be a promising tool for assessing effects of changes in hydraulic parameters of aquifer system and to gain more insight in the highly variable internal flow processes.
Groundwater Model, River Leakage, Pumping Wells, Simulation
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