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IJSTR >> Volume 9 - Issue 8, August 2020 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



The Influence Of Hydraulic Parameters In Different Groundwater Systems On The Results Of Modular Groundwater Optimizer (MGO)

[Full Text]

 

AUTHOR(S)

AHMED M. I. ABD ELHAMID

 

KEYWORDS

Confined and Semiconfined Aquifers, Dewatering systems, Groundwater system, Hydraulic Parameters, Modular Groundwater Optimizer (MGO), Visual Modflow.

 

ABSTRACT

The aim of this study is to evaluate the effect of the hydraulic parameters of groundwater systems on the results of simulation optimization modelling when applied to the dewatering systems design for different construction sites in Egypt. The hydraulic parameter which will be evaluated is mainly the hydraulic conductivity represented by the position of the groundwater table according to different soil stratification taking into account the different excavation depths at the construction sites. This work takes into consideration six executed construction projects, classified into two groups according to the position of the groundwater table with respect to the depth of excavation; the first group where the excavation reaches Sandy Soil (ESS), the second group where excavation reaches Clayey Soil (ECS) the two systems are treated as semi-confined and confined systems respectively. The Modflow as a numerical simulation model and the Modular Groundwater Optimizer (MGO) as an optimization model were integrated with each other as a simulation-optimization tool. Each group or system was simulated by the model using the pumping test results obtained from the field data and the wells which were already executed for pumping. The model was run until reaching the values of the drawdown that were observed by the piezometric/observed wells at each site. The model was run another time using MGO in order to minimize the wells number, the quantity of water pumped from them and the dewatering systems cost. By comparing the outputs of the two runs for the same site regarding the achieved drawdown value either by the executed wells or from the optimization results of the two groups of ESS and ECS, the comparison revealed that the drawdown can be achieved with average saving of (28%, and 25%) of the actually number of executed wells respectively, so it is highly recommended to apply MGO when designing any dewatering system in order to achieve the most cost-effective pumping system especially in the case of ESS.

 

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