Modelling
tools to predict groundwater cycle and migration of water 
soluble substances

 

Groundwater modelling is being used as a tool
to make decisions and develop management strategies for
groundwater protection planning. A model is a simplification
of reality in order to aid in the understanding of and/or
predict the outcomes of the real system. A conceptual
model
is a simplified representation of how the real
system is believed to behave based on a qualitative analysis
of field data. A quantitative conceptual model includes
preliminary calculations for key processes. Mathematical
models
are distinguished as follows:

Analytical model: exact mathematical solutions
of the flow and/or transport equation for all points in time
and space.
Deterministic model: A model where all elements
and parameters of the model are assigned unique values.

Numerical model: Solution of the flow and/or
transport equation using numerical approximations, i.e.
inputs are specified at certain points in time and space
which allows for a more realistic variation of parameters
than in analytical models. However, outputs are also produced
only at these same specified points in time and space.
Probabilistic model: An aggregation of model
realisations, where the input parameters to each realisation
are characterised by probability distributions.

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