The Delayed Effects of Variable Density Flow on Flow and Heads in Fresh Groundwater Frans Schaars Theo Olsthoorn Mark Bakker.

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Presentation transcript:

The Delayed Effects of Variable Density Flow on Flow and Heads in Fresh Groundwater Frans Schaars Theo Olsthoorn Mark Bakker

Variable density modeling Special interest in the movement of the interface Environmental risk of salinization This presentation: The effect of the variable density flow on flows and heads in the fresh groundwater zone 31-12-2018

? Changing flow patterns equilibrium 1mm/d transition 31-12-2018

Calculations using Sea Water Intrusion Package A formulation for seawater intrusion that does not require a vertical discretization of the aquifer The formulation is intended for regional modeling for periods of up to 100 years Implemented in a public-domain MODFLOW package 31-12-2018

The mass balance is replaced by a volume balance (Boussinesq) Approximations The resistance to vertical flow within an aquifer is neglected (Dupuit) The mass balance is replaced by a volume balance (Boussinesq) Diffusion and dispersion are neglected Heavier water is not allowed above lighter water 31-12-2018

Case 1 cross section increased recharge on island z(m+ msl) x(m) 31-12-2018

Case 1 cross section increased recharge on island Phreatic head(m+msl) time(y) 31-12-2018

Case 2 low lying polder area 31-12-2018

Case 2 low lying polder area 31-12-2018

Case 2 low lying polder area 31-12-2018

Case Terschelling Island 31-12-2018

The magnitude and direction of the effect is time-dependent. Conclusions The movement of brackish or salt water can have a considerable impact on the flow and heads in the fresh groundwater zone. The magnitude and direction of the effect is time-dependent. For predictions the transmissivity should be adapted to the considered timescale. 31-12-2018