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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology


Simulating of Groundwater Flow in Sag El Naam Basin, North Darfur State, Sudan

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Author Anas Jafar, Adil Elkrail, Salah Abdel Razig
ISSN 2225-7217
On Pages 716-721
Volume No. 4
Issue No. 12
Issue Date January 01, 2015
Publishing Date January 01, 2015
Keywords Simulation, Trial – and – Error, zone budget, aquifer, calibration



Abstract

The main objective of this study is to improve the understanding and evaluate the complex hydro geological situation and the groundwater flow regime in Sag El Naam Basin, based on visual MODFLOW computer Code. Arc GIS was used for conceptual model construction. A quietest software was used for calculating aquifers’ hydraulic properties. The model was run and calibrated using trail-and error techniques. The aquifer hydraulic conductivity, storativity, recharge, and constant head boundary (CHB) were adjusted during calibration to obtain acceptable match between calculated and observed heads and fluxes. The calibration of three-dimensional finite difference flow model of Sag El Naam basin was realized through acceptable average (RMS) of 0.14 m, residual mean error of 0.09 m, average absolute mean error (AM) of 0.12 m, average standard error of the estimate (SEE) of 0.02 m and average normalized root mean square (NRMS) of 1.49 %.The contour map of the simulated heads visualized closer lines at the north-western and south-western sides assigning recharge from the Shagara basin and Shangli-Tobya sub-basin towards the southwest with steep hydraulic gradient and low permeability, whereas, the water heads decreasing towards the southwest and inside towards the center forming cone of depression which is considered to be due to over pumping. The model assigns the regional flow direction towards the north western, southwestern directions and from the peripheries of the basin towards the center. The main components of water budget were calculated for four years with total Inflow varying between 321.74 and 390.89 and total Outflow between 321.81 and 385.68 mcm. Generally this study successfully formulated a new method of groundwater modeling, confirmed that visual MODFLOW can be used as a comparative technique for evaluation of groundwater flow regime in Sag El Naam Basin.


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