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Sultan Qaboos University (2018)

Assessment of Groundwater Level and Salinity in Al-Suwayq Catchment using MODFLOW and MT3DMS

Al Lamki Raya Hilal Mohammed

Titre : Assessment of Groundwater Level and Salinity in Al-Suwayq Catchment using MODFLOW and MT3DMS

Auteur : Al Lamki Raya Hilal Mohammed

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) Civil and Architecural Engineering 2018

Résumé
As Suwayq represents one of the crucial fertilized area along Al Batinah coastal plain in north of Oman. Groundwater mainly used to supply agricultural, animals production, domestic and industrial activities. In 1970’s, the development in different lives sectors such as electricity led to serve exploitation which in turn affected the quality of the used water. By this salinity became the main concern since1980’s that have to be given a priority to be mitigated. This was established through continuous research studies to monitor the happened deficit to come with sustainable management plans. As a result, capturing this phenomena through modeling to simulate the situation of groundwater numerically in reference to abstraction and recharge rates remains the main aim for this study to be highlighted. Similarly, suggesting new plans to tackle the continuous decline in water head still represents one objective belonged this research. In this study, MODFLOW was implemented as three dimensional code to visualize the actual system of groundwater through 2010 up to 2017. Uncertainty in MMRWR data and unavailability of some of them imposed the model to be calibrated. The calibration basically was sensitive to interflow recharge from Jabel, abstraction and hydraulic conductivity. Through calibration, good agreement between computed and observed heads was achieved (R2=0.993) in steady state simulation. Addition to this, strong relation was obtained the in transient computation with a correlation coefficient R2 of 0.977. Likewise, the simulated well hydrographs show closed behavior to observed ones as illustrated in transient flow simulation. The model showed the existence of reverse seawater intrusion as a moment that extraction from storage overcomes the recharge. The drop in head had exceeded four meters beneath sea level exclusively in coastal wells. This growing phenomena shall be reclaimed through dense effort by making new decisions to recover the falling in head. The optimal management system can be achieved either by minimizing the daily extraction or by applying artificial recharge from tertiary treated wastewater (TWW) or desalinated water. Using managed aquifer recharge (MAR) in term of artificial recharge is able to save up to 335 MCM from deterioration as impacted by intruding seawater by end 2035. Beside to the ability of artificial recharge to deviate seawater, it is able to increase the storage and achieve the desired groundwater sustainability.

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Page publiée le 24 novembre 2019