Three-dimensional variable-density flow simulation of a coastal aquifer in southern Oahu, Hawaii, USA

2005 ◽  
Vol 13 (2) ◽  
pp. 436-450 ◽  
Author(s):  
Stephen B. Gingerich ◽  
Clifford I. Voss
Keyword(s):  
Coastal Aquifer ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Variable Density ◽  
Variable Density Flow ◽  
Density Flow ◽  
Dimensional Variable

3D Variable Density Flow Simulation to Evaluate Pumping Schemes in Coastal Aquifers

2014 ◽  
Vol 28 (14) ◽  
pp. 4943-4956 ◽  
Author(s):  
Charalampos Doulgeris ◽  
Thomas Zissis
Keyword(s):  
Coastal Aquifers ◽  
Flow Simulation ◽  
Variable Density ◽  
Variable Density Flow ◽  
Density Flow

scholarly journals Groundwater withdrawal in randomly heterogeneous coastal aquifers

2017 ◽  
Author(s):  
Martina Siena ◽  
Monica Riva
Keyword(s):  
Coastal Aquifers ◽  
Groundwater Resources ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Variable Density ◽  
Groundwater Withdrawal ◽  
Mixing Zone ◽  
Variable Density Flow ◽  
Dimensional Variable ◽  
The Impact

Abstract. We analyze the combined effects of aquifer heterogeneity and pumping operations on seawater intrusion (SWI) in coastal aquifers, a phenomenon which is threatening Mediterranean and worldwide regions. We conceptualize the aquifer as a three-dimensional randomly heterogeneous porous medium, where the spatial distribution of permeability is uncertain. The geological setting of our study is patterned after the coastal aquifer of the Argentona river basin, in the Maresme region of Catalonia (Spain). Numerical simulations of transient, three-dimensional, variable-density flow and solute transport are performed within a stochastic Monte Carlo framework. We consider a variety of groundwater withdrawal schemes, designed by varying the screen location along the vertical direction and the distance of the wellbore from the coastline and from the freshwater-saltwater mixing zone, in order to assess the impact of the pumping scenario on the contamination of the freshwater pumping well for a prescribed production rate. SWI is analyzed by examining isoconcentration curves and global dimensionless quantities characterizing (i) inland penetration of the saltwater wedge and (ii) width of the mixing zone. Our results indicate that heterogeneity affects the (three-dimensional) seawater wedge either in the presence or in the absence of pumping, by reducing toe penetration and enlarging the width of the mixing zone. Simultaneous extraction of fresh and saltwater from two screens along the same wellbore located within the transition zone is effective in limiting SWI during groundwater resources exploitation.

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