Waters, Vol. 2, Issue 1, Dec  2019, Pages 55-66; DOI: 10.31058/j.water.2019.11004 10.31058/j.water.2019.11004

Numerical Simulation of Groundwater Flow in Shendi Sub-Basin, Sudan

, Vol. 2, Issue 1, Dec  2019, Pages 55-66.

DOI: 10.31058/j.water.2019.11004

Adil Balla Elkrail 1* , Amin Dafaalla 2 , Mohamed Adlan 3

1 Department of Hydrogeology, Faculty of Petroleum and Minerals, Al-Neelain University, Khartoum, Sudan

2 Department of Geology, Faculty of Science, Nahr Anneel University, Sudan

3 Department of Hydrogeology, Faculty of Petroleum and Minerals, Al-Neelain University, Khartoum, Sudan

Received: 2 December 2019; Accepted: 5 December 2019; Published: 9 December 2019

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Abstract

This study investigated the groundwater regime of the porous medium of Cretaceous sedimentary formation in Shendi sub-basin. The aims of this study are to determine the aquifer characteristics, groundwater flow dynamic, and groundwater balance and storage capacity of the aquifer, using groundwater model techniques. A three dimensional numerical model was developed for two aquifer system to simulate groundwater flow through variably saturated porous medium. Visual MODFLOW, Geographical Information System (GIS) and Aquifer Test techniques were used for model conceptualization, data processing and obtained results manipulation. Model simulation was optimized by using a trial and error method. Acceptable model calibration was obtained with root mean square error (RMS) of 0.313 m and absolute residual mean (ARM) of 0.124 m, normalized root mean square (NRMS%) of 0.6 % and mass balance discrepancy of 0.01% with water reserve of 14.36 m3/d after all prevailing abstraction activities. The general groundwater flow direction, as depicted from model results, is towards east and northeast with a cone of depression at the center of the area, which attributed to heavy abstraction for agricultural activities. The annual groundwater supply from well fields in both aquifers was estimated to be 37×106 m3. Aquifers storage capacities of covering area of 8325 km2 were calculated to be 60×106 m3 and 63×106 m3 for upper and lower aquifer respectively. The sensitivity analyses reflected that the model was more sensitive to hydraulic conductivity and least sensitive to specific storage. The model was validated after sufficient testing had been performed to ensure an acceptable level of predictive accuracy.

Keywords

Groundwater Modeling, Simulation, Aquifers, Visual MODFLOW, Hydrogeological Parameters, Specific Coefficient, Water Budget

Copyright

© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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