1. Test Programme
2. Test Data / Results
In conjunction with the Field and Laboratory
modelling is the numerical
modelling. The objective of the numerical modelling
is:
- To identify the best numerical approach / approaches
for simulating breach formation through embankments
- To assess and quantify the level of uncertainty of
current breach modelling techniques
- To incorporate knowledge gained from undertaking the
field and Lab. tests into existing modelling tools.
Figure 1 shows the interaction between the
numerical modelling work and the field and laboratory modelling
tests.
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Figure 1: Interaction between field, lab. and numerical work
There are three aspects to this numerical modelling programme:
- 'Blind' and 'Aware' Testing
A significant number of the numerical model testing will
be undertaken as'blind' tests to ensure complete objectivity.
Blind means that numerical modellers will be asked to undertake
their work and submit their results the results from the
field and laboratory tests are released. Modellers will
then also be invited to submit further (revised) modelling
results after receiving the field or lab test results ('Aware'
testing). Details and justification of any variations to
the modelling approach (as compared to the blind tests)
should accompany any results submitted.
The following table shows a list of numerical modelling
runs:
- Participation in Numerical Modelling
Participation in as many of the tests listed above is encouraged
from as wider a group of participants as possible. However,
it is recognised that the number of tests listed above is
large and probably beyond the time availability of many
participants. Modellers are therefore invited to undertake
a number of core modelling tests and as many of the remaining
tests as they are able.
- Core Runs:
Core modelling tests include both blind and aware runs for:
• 5 field tests (NF1, NF2, NF3, NF4, NF5)
• 9 lab replication tests (NL2 , NL45 , NL5, NL9 ,
NL10, NL12, NL13, NL15, NL17)
- Remaining Runs:
There is considerable value to be gained in also undertaking
modelling for the remaining lab tests. Many of these variations
will require minimal change to numerical models for simulation
and modellers are encouraged to participate wherever possible.
[Note: Analysis of these runs will be undertaken by at least
1 member of the IMPACT project team however
multiple analysis is preferred].
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Modelling Analysis
Modellers are encouraged to undertake more detailed analysis
of model run and performance wherever possible. For example:
- Tests to check the effect of the different assumptions
on the model results.
- Tests to check the effect of the variation (accuracy)
of the field and lab data on the model results.
- Tests to identify parameters that have a major effect
on the model results.
The above is a list of suggestions. Each modeller
is encouraged to undertake the tests that he/she sees appropriate
for his/her model.
The submitted results have to be in ASCII format. Results
should as a minimum include the following:
- Outflow hydrograph at the breach location.
- Breach development with time (width and depth)
- Reservoir water levels hydrograph. (far enough from the
breach to avoid the draw down effects)
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