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UNESCO-IHE Institute for Water Education, Delft (2019)

Optimal pumping strategies for sustainable utilization of Eocene aquifer in West Bank, Palestine

Ahmed, Tanvir

Titre : Optimal pumping strategies for sustainable utilization of Eocene aquifer in West Bank, Palestine

Auteur : Ahmed, Tanvir

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2019

Résumé partiel
Groundwater is one of the most essential resources for most of the countries in the world and widely used for irrigation and drinking purpose. The Eocene aquifer, located in the Northern part of West Bank is one of the main groundwater systems of Palestine. The aquifer has an area of 540 km2 and is much utilized for agriculture and domestic water supply. Overexploitation of the aquifer took place over the last decades and consequently, groundwater levels decline and many wells are drying up. Thus, effective management should be taken into account which involves identifying the locations, timing, and rate of water extraction for sustainable utilization of groundwater resources. The aim of this study is to develop spatially distributed optimal pumping strategies for sustainable management of Eocene aquifer. The developed steady-state groundwater flow model for the Eocene aquifer under the GDSS project was adapted for this study. Firstly, the current hydrogeological situation of the aquifer was assessed. Uncertainty analysis of the groundwater model was performed using Monte Carlo simulations to understand the variation of model outputs with variation of several uncertain parameters. Simulation-optimization technique was used for identifying the optimal well location and pumping rates. The MODFLOW and GWM (Groundwater Management) were used as a simulation model and optimization tool, respectively. The uncertainty of the identified optimal solution was assessed in terms of reliability. Finally, a web-based application for the groundwater model simulation was developed with a simplified GIS-based web interface to aid the decision maker. Annual aquifer recharge was estimated as 75.5 Mm3 from which 56 Mm3 (74% of recharge) was withdrawn through the pumping wells. The model was found highly uncertain to uncertain model inputs. The difference in simulated groundwater head between 5 percentile and 95 percentile was found in the ranges of around 40 to 95 m, while the inter-quartile range varies between 20 – 40 m throughout the aquifer.

Mots Clés  : groundwater groundwater modelling aquifers water supply Palestine

Présentation

Page publiée le 17 mars 2020, mise à jour le 2 avril 2021