Аннотация
The influence of roof shape on sound propagation in a densely build-up
city centre is evaluated. Road traffic noise propagation from a street
canyon to an adjacent, non-directly exposed building façade is numerically
studied by the finite-difference time-domain method. A large number
of common and less common roof shapes were analyzed in an idealized
city canyon configuration. Roof shape can be responsible for differences
in road traffic noise shielding exceeding 10 dBA, averaged over the
shielded façade. Therefore, roof shape can be considered as an important
means to limit sound pressure levels at a quiet side; various researchers
indicated that the presence of silent zones and façades may limit
city noise annoyance. With increasing vehicle speed, the choice of
roof shape becomes more important. The roof top height was shown
to be a bad predictor of shielding efficiency in the equal-building-volume
approach followed in this study.
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