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on the 1 st July at 00:00. The centre of the domain was at 51.3° N, 0° E. To ease the
interpretation of the results all simulations took place on cloud free days, and the rain and
cloud METRAS routines were not used.
The parameters for the urban area for the idealised urban_BEP test case have been defined
in Section 3.5.4. The parameters for the METRAS ‘Urban’ class (used in the Orig
simulation) and ‘Meadows’ land cover class (used in the all simulations) have been defined
in Table 3.1 on page 57 in Chapter 3. The urban_BEP idealised test case was used as the
control simulation in the sensitivity study.
4.2 Results for an idealised domain
In the following sections the results for the implementation of BEP within METRAS for an
idealised domain are presented. The focus is on reproducing results documented in the
literature in order to establish that BEP has been correctly implemented, and to demonstrate
the robustness of the new METRAS+BEP model.
As the simulations started at midnight the first day was considered to be part of the spin up
phase, and therefore all the results presented were taken from the second day of simulation.
Vertical profiles of potential temperature, wind speed and turbulent kinetic energy
Figure 4.1 shows the vertical profile of potential temperature at the centre of the domain for
the Rural simulation, the Orig simulation and the urban_BEP simulation at 04:00 of the
second day of simulation.
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