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OGATA-BANKS CALCULATOR
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Ogata &
Banks (1961) developed an analytical solution to the 1D
advection-dispersion equation. The calculator given in this
newsletter uses this analytical solution to determine the
concentration of a contaminant down-gradient from a constant source, at
a given distance x, and time t. A retardation factor can be
either calculated in advance using the retardation calculator given
below the Ogata-Banks calculator before entering it into the
Ogata-Banks calculator. If no retardation is desired, enter a
value of 1.
The 1D
advection-dispersion equation, including retardation is given by:
And the
Ogata-Banks analytical solution to this equation is:
This is
only one of many ways to calculate the transport of a contaminant in
groundwater. There are several groundwater transport software
packages available, including RISC.
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There are many resources
available for more information on the Ogata-Banks equation, and
retardation. For this
newsletter the following textbooks were used:
Fetter, C.W. (1994).
Applied Hydrogeology, Third Edition. Published by Prentice-Hall
Inc., New Jersey, USA.
Freeze, R.A. and Cherry,
J.A. (1979) Groundwater. Published by Prentice-Hall Inc.,
New Jersey, USA.
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Click here for the best price on
RISC
Click here to download a demo of
RISC
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RISC is a software package
for performing fate and transport modelling and human health risk
assessments for contaminated sites. A unique feature of RISC is its
ability to perform a backward risk calculation as well as the
conventional forward risk calculation.
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Main Features of RISC
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Customizable Chemical Database
RISC includes a customizable
chemical database that comes with 82 chemicals.
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Additive Risk
RISC has the ability to
calculate additive risk due to multiple pathways, compounds and
receptors (such as a resident exposed as both a child and an adult).
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Monte Carlo Evaluation
RISC has a Monte Carlo
capability for probabilistic risk evaluation.
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Several Exposure Pathways
The exposure pathways in RISC
include:
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Ingestion of soil
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Dermal contact with soil
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Ingestion of groundwater
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Dermal contact with
groundwater
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Inhalation in the shower
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Inhalation of outdoor air
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Inhalation of indoor air
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Ingestion of surface water
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Dermal contact with surface
water
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Several Fate and Transport Models
The fate and transport models
available in RISC include:
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Variety of Receptor Points
RISC is the only risk package
that offers fate and transport models that are available to estimate
receptor point concentrations in groundwater and indoor and outdoor
air.
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