Digital Signal Processing Reference
In-Depth Information
Mass Balance Verification of the Water Quality Model
A special type of conservative tracer in Delft3d -WAQ is a parameter called 'Continuity'. It has no
physical or chemical meaning. Instead it is used to establish the numerical correctness and stability of
the simulation. By assigning a concentration of 1 g/m3 to all water sources (: initial condition,
boundary condition and discharges) the Continuity concentration should remain 1 g/m3 during the
whole simulation, as there are no processes that dilute or concentrate it and all water has a
concentration of 1 g/m3.To verify the mass balance of the developed water quality model and the
simulation stability the continuity parameter was simulated for the whole modelling period. The
variation of the results at selected locations in lake shows acceptable range between (0.999 and 1.005).
Figure (7-21)
shows the results of mass balance simulation by the model at different monitoring
locations.
Figure (7-21) shows the results of mass balance simulation by the model at
different monitoring locations within the lake.
Model Results
The main water quality model includes the first three substances groups mentioned above (general
group including temperature and salinity), (oxygen group) and (suspended matter group). The
following section shows the results of the model during field measurements (June27
th
-29
th
, 2006).
The predicted values of temperature are in the range of (25-28
o
C) and this is the same range of
measured temperatures at the same locations during field measurements. The results of salinity
predictions showed a close matching with the field measurements, where the ranges of salinity are
between (1.4-1.37 g/kg).
Figure (7-22)
shows the water Temperature levels at different locations in
the lake.
Figure (7-23)
s
hows the salinity variations at the same locations.
T
he results from modelling
of the oxygen group parameters are shown in
figures (7-24 a,b,c)
.
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