Aufbau einer Datenbank zur Berechnung exemplarischer Lärmsituationen unter Einbeziehung von Geräuschemissionsdaten des Verkehrsträgers Straße und meteorologischer Daten. [Establishment of a database to calculate exemplary noise situations, including noise emission data from road transport and meteorological data.] Bericht zum Forschungsprojekt 02.416 der Bundesanstalt für Strassenwesen BASt.
20210497 ST [electronic version only]
Liepert, m. Skowronek, V. Eberlei, G. Crijenkovic, M. Müller, S. Schady, A. & Elsen, K.
Bergisch Gladbach, Bundesanstalt für Strassenwesen BASt, 2021, 101 p., 34 ref.; Berichte der Bundesanstalt für Strassenwesen : Verkehrstechnik ; Heft V 345 - ISSN 0943-9331 / ISBN 978-3-95606-594-1
|Samenvatting||The legal noise prevention and also the noise remediation at road traffic routes in Germany is based on calculated noise levels at buildings in need of protection and their comparison with limit or trigger values. Binding calculation methods (especially RLS-90 and RLS-19) are based on a weather situation with favorable sound propagation. However, immission levels and thus the intensity of the noise pollution can also depend on the current weather conditions in the propagation path. These meteorological propagation conditions are therefore individually different depending on the situation and are not individually considered in these calculation methods. Therefore, the aim of the present research project is to determine and present the state of the art and science in the consideration of the influence of weather on sound propagation in calculation methods, to verify the results obtained in the calculation methods by long-term measurements and finally to propose a practicable and simple method to consider the influence of meteorology. The proposal uses the calculation method according to RLS-90 or RLS-19 as a basis and allows in individual cases, if necessary, a noise forecast adapted to the weather situation. For this purpose, first results of a literature study on the different existing methods of propagation calculation and the consideration of meteorological boundary conditions contained (or not contained) therein were presented and systematically compared. The effects of the different methods of dispersion calculation were quantified under variation of meteorology in four computational test scenarios and the results of the comparative calculations were presented in diagrams. The test scenarios are divided into three modelled cases of simple geometry (straight road without topography, straight road with shielding and two intersecting roads) and the modelling of a realistic case. The realistic case is the modeling of a test area at the federal highway 8 west of Munich, where long- term measurements of sound and meteorological boundary conditions were performed at different distances. On the basis of the long-term measurements, the results of the computational procedures for the consideration of meteorology were compared with real measured data and the corresponding weather conditions. The weather conditions were divided into classes of wind direction, wind speed and temperature gradient (stability) and their combinations were presented according to their effect on sound propagation. It can be shown unanimously, both by means of advanced calculation methods and by measurements, that the wind direction has the most significant influence on sound propagation, the wind speed (again depending on the direction) has a smaller influence and finally the temperature gradient (stability) has a relevant influence on sound propagation only at large distances and in connection with shielding. Based on these results, a method proposal was developed, with which the influences of wind and temperature gradient can be considered for special considerations in comparison to the standard case of RLS-90/RLS-19. In individual cases, a supplementary aid for a weather-corrected noise assessment can thus be used. A calculation of a long-term average level is thus also possible in principle, but the associated effort with regard to the relevance of the sound propagation conditions to the long-term average level is considerable. The possibility to consider certain meteorological situations separately is the intended main application of the proposal. However, further validations in different regions are necessary to secure this proposal. The results of the long-term measurements and the calculations in the test scenarios were compiled in a database, which now allows to derive weather-corrected immission levels for specific meteorological situations for the considered study area. An extension or transfer to other investigation areas is possible in the future. (Author/publisher)|
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