Modeling of groundwater flow for Mujib aquifer, Jordan

Journal of Earth system science

Tamer Al-Assa’d2²  Fayez Abdulla1¹ 

[1]Associate Professor of Water Resources, Civil Engineering Department, Jordan University of Science & Technology, P.O Box 3030, Irbid 22110, Jordan.$$

[2]Water Resources Consultant, Eco-Consult, Amman, Jordan.$$

关键词: Modflow;    Mujib basin–Jordan;    groundwater modeling;    calibration;    validation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Jordan is an arid country with very limited water resources.Groundwater is the main source for its water supply.Mujib aquifer is located in the central part of Jordan and is a major source of drinking water for Amman,Madaba and Karak cities.High abstraction rates from Mujib aquifer during the previous years lead to a major decline in water levels and deterioration in groundwater quality. Therefore,proper groundwater management of Mujib aquifer is necessary;and groundwater flow modeling is essential for proper management.For this purpose,Mod flow was used to build a groundwater flow model to simulate the behavior of the flow system under different stresses.The model was calibrated for steady state condition by matching observed and simulated initial head counter lines.Drawdown data for the period 1985-1995 were used to calibrate the transient model by matching simulated drawdown with the observed one.Then,the transient model was validated by using drawdown data for the period 1996-2002.The results of the calibrated model showed that the horizontal hydraulic conductivity of the B2/A7 aquifer ranges between 0.001 and 40 m/d. Calibrated speci fic yield ranges from 0.0001 to 0.15.The water balance for the steady state condition of Mujib aquifer indicated that the total annual direct recharge is 20.4 × 106 m3, the total annual in flow is 13.0 × 106 m3, springs discharge is 15.3 × 106 m3, and total annual out flow is 18.7 × 106 m3. Different scenarios were considered to predict aquifer system response under different conditions. The results of the sensitivity analysis show that the model is highly sensitive to horizontal hydraulic conductivity and anisotropy and with lower level to the recharge rates.Also the model is sensitive to specific yield.

【 授权许可】

Unknown