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4.2.5 Example
Use – Ventilation Scenario (Expansion of an Earth Dump)
4.2.5.2 Methods
As shown in Chapter
4.3.1, a digital elevation model was well-suited to
depicting the local land conditions and for developing a wind
tunnel model. This was used in the current case, particularly
because changes in the landscape could also be quickly
represented. Figure
4/25 shows the local
situation, although the vertical axis is distorted. Figures
4/26a und b depicts the
expansion of the large proposal from two different points of
view. One can recognize the expansion areas on the west side of
the existing earth dump.
In the context of the study, a change in the
average wind velocity and turbulence from the planned expansion
at the periphery of the existing dump form needed be examined.
Since the influence of the hill on the air flow field also
depends upon small details of the topography, changes in the
wind field could not be estimated with the help of numerical
models, since these simplify greatly the spatial structure of
the land area.
A model of the earth dump at 1:1000 scale was
constructed for studying the wind field in a wind tunnel. The
topography was modeled out to a distance of 1,200 m from the
center of the planned dump expansion. In addition to the
topography, the buildings of the existing commercial district as
well as those of the planned expansion in the commercial
district were replicated. The frequency of wind directions was
taken from an existing climate study (BAUMUELLER et al., 1985).
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Fig. 4/25:
Digital topography
model with the "Green Heiner". View towards
northeast. Vertical axis exaggerated. Developed areas in gray.
Source: ZENGER et al., 1991 |
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Fig. 4/26a: Digital
topography model of the large solution. Direction of view from
northeast, Source: ZENGER et al., 1991
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Fig. 4/26b: Digital
topography model of the large solution. Direction of view from
southwest, Source: ZENGER et al., 1991
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