MIKE 21 BW, User Manual, Page: 21 / 196

Running the Production Simulations
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3.5.2 Verification
The situations which you select for calibration and verification of the model
should cover the range of situations you wish to investigate in the production
runs. However, as you must have some measurements/observations against
which to calibrate and, as the measurements are often only available for short
periods, you may only have a few situations from which to choose.
When you have finished the calibration you can run one more simulation for
which you have measurements (or other data) without changing the calibra-
tion parameters. If you then get a satisfactory agreement between the simula-
tion results and the measurements you can consider your calibration to be
successful.
3.5.3 Calibration parameters
When you run your calibration run for the first time and compare the simula-
tion results to your measurements (or other information) you will, in many
cases, see differences between the two. The purpose of the calibration is
then to tune the model so that these differences become negligible. You can
change the following model specifications in order to reduce the differences:

Wave conditions

Porosity

Bed resistance

Bathymetry

Wave breaking

Moving shore line
Recommendations on how the specification can be changed are given in the
Reference Manual.
3.6 Running the Production Simulations
As you have calibrated and verified the model you can get on to the “real”
work, that is doing your actual investigation. This will, in some cases, only
include a few runs.
3.7 Presenting the Results
Throughout a modelling study you are working with large amounts of data
and the best way of checking them is therefore to look at them graphically.
Only in a few cases, such as when you check your bathymetry along a
boundary or you want to compare simulation results to measurements in
selected locations, should you look at the individual numbers. Much empha-