التحليل الابعدي لفعالية ضخ االمياه الجوفية في برك ضحلة افتراضية في منطقة سفوان –الزبير جنوب العراق

	التحليل الابعدي لفعالية ضخ االمياه الجوفية في برك ضحلة افتراضية في منطقة سفوان –الزبير جنوب العراق
Iraqi Journal of Science
Article 1, Volume 46, Issue 1, 2005, Pages 189-198
Abstract
The dynamics of flow associated with pumping form large diameter shallow ponds is investigated. Shallow ponds are considered as a means to develop unconfined shallow aquifer in many areas across the world. Large storage of such ponds allows pumping for short periods with large pumping discharge or for relatively long period with lower rates. A numerical finite-difference based model is used to establish effects of well storage, pond size/ partial penetration and pumping time on the pumping discharge of ponds. Numerical results are presented in terms of generalized dimensionless variables. Both steady and transient cases are identified. The results enable us to evaluate both the short term and long lam yields that can be obtained by pumping form large ponds constructed in phreatic aquifers of given dimensionless and properties. A design procedure is selected/ for transient case/ depending upon the model runs and dimensionless analysis. The parameters that can be obtained from design procedure include pond diameter/ pumping discharge and pumping schedule for given aquifer properties if a daily pumping-recovery cycle is designed as a means to develop the shallow aquifer. Design parameters are suggested for the purposes of planning and design of such pond as a water source for irrigation in Safwan-Zubair area/ south of Iraq. It can be stated that constructing ponds with 15m diameter and pumping time of 0.5d with pumping discharge of about 1980 m3/d are sustained for water demands for irrigation purposes in the area of question. The values of design parameters are based on averages and generalizations.

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