| Zugriffsnummer | 55595 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Predicting the effects of the ground impedance in long-range low-frequency propagation with the Semi-Analytic Finite-Element (SAFE) method |
| Autor(in); Institution | |
| Quelle/Jahr | Proceedings of Forum Acusticum - EuroNoise 2025 : 11th Convention of the European Acoustics Association::(2025), 1239 - 1242 |
| Availability | [online only] |
| Herausgeber(in) |
Prida, Daniel de la
|
| ISBN | 978-84-87985-35-5 |
| DOI | |
| Verlag | Sociedad Espanola de Acústica |
| Konferenzangaben | Forum Acusticum - Euronoise 2025, Malaga, 23-26, June, 2025, Spain |
| Freie Schlagworte | low-frequency sound ; outdoor propagation ; normal-mode methods |
| Zusammenfassung | The outdoor propagation of infrasound can be impacted by atmospheric conditions, such as temperature inversions and winds, that channel sound into acoustic waveguides allowing for efficient long-range propagation. For near griund acoustic waveguides, ground impedance can also play an important role. In this study, the Semi-Analytic Finite Element (SAFE) method is used to predict the acoustic field generated by a point source emitting into a stratified, range independent atmosphere with a logarithmic wind profile. We study the influence of ground impedance by setting two cases with different ground boundary conditions: a fully reflective ground condition, mimicking sea propagation; and an impdance ground boundary condition, mimicking a sansy landscape. We found a significant contrast in the two test cases for the near-ground acoustic waveguides, especially for a particular near-ground acoustic mode. Thus, ground impedance should be included in predictions. |
| Kostenfreier Zugang | Freier Zugang |
| Rechteinformation | CC BY 3.0 ; Creative Commons Attribution 3.0 License |
| Themenbereich der Metrologie | Akustik, Ultraschall, Beschleunigung |
| Innovationscluster | Umwelt und Klima |
| Geschäftsfelder | Metrologie für die Gesellschaft ; Grundlagen der Metrologie |
| Förderinformationen (1) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderungsnummer: JA 3325/2-1 |
Zitierung
Castro Mota, R., Williams, P., Kirby, R., & Jacob, S. (2025). Predicting the effects of the ground impedance in long-range low-frequency propagation with the Semi-Analytic Finite-Element (SAFE) method. Forum Acusticum - Euronoise 2025, Malaga, 23-26, June, 2025, Spain. https://doi.org/10.61782/fa.2025.0691