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Subsections
Several substance-related parameters may not be entered as
distributed values but the user interface does not warn about this
directly. Classified according to the dialog's cards these are:
Identification:
Obviously none of the identifications can be entered as distributed.
Physico-chemical properties:
molar mass
acid versus basic dissociation parameter
Degradation:
anaerobic biodegradation correction factor
anoxic biodegradation correction factor
affinity constant for aerobic / anaerobic
sorbed biodegradation correction factor
temperature correction for biodegradation
In-stream removal:
correction factor for biodegradation in rivers
Sewage treatment:
correction for biodegradation in activated sludge
Market Data:
domestic product consumption.
Please note, furthermore, that it is possible to specify a distribution for a
general elimination rate, but not for a site-specific elimination rate.
Nevertheless, it is possible to have a distributed elimination rate for,
e.g. activated sludge plants, and a fixed rate for a selected site.
A set of all default values to be used for some scenarios is currently
only possible via a workaround: Create a generic scenario without a substance
or catchment. All further scenarios can be created from this generic one by
saving them as new scenarios (use Save As).
Please note that the GREAT-ER analysis tools are designed to analyse
distributions of values. Although it is possible to run a simulation with one
Monte-Carlo shot, the analysis functions will probably fail when applied to
these simulation results.
Please note that PEC calculations are not available if a subcatchment
is selected.
Please note that due to some systems' workarounds, the start-up phase of the
help system may take an unusually long time.
The operating system GREAT-ER is designed for is WINDOWS NT 4.0.
Please note that GREAT-ER will not work properly under
WINDOWS 95, although ARCVIEW 3.x does. The reasons for this
are some basic incompatible techniques in executing models and
analysis tools which are
not available under WINDOWS 95. Executability under
WINDOWS 98 was not tested.
Please note that
the feature of directory creation is limited within both the set-up
and the GREAT-ER user interface (e.g. new scenario):
The last directory in a path can be created, but new multi-stage
directories are not possible.
Next: Model System
Up: Limitations
Previous: ARCVIEW
F. Koormann & J.-O. Wagner, Institute of Environmental Systems Research, University of Osnabrück