{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101618"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101618","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of atmospheric profiles on local infrasound propagation","abstract":"A deep understanding of the impact of the natural environment on local (< 150 km) infrasound propagation is important, specifically for persistent infrastructure monitoring. Passively sensing the infrasound field provides useful information about the condition of infrastructure or any activity of interest in the infrasound passband. Meteorological profiles strongly influence the propagation of an infrasound signal via refraction; therefore, understanding the effects of different profiles is crucial for both determining the source of a signal and estimating how far away that signal may be readily detected. This paper focuses on simplified vertical temperature and wind profiles up to 20 km altitude and their effect on an infrasonic signal emanating from an arbitrary point source. A wide-angle, finite-element infrasound propagation model that correctly handles discontinuities in wavenumber is used for calculating transmission loss. A large number of simulations were performed to investigate the effect that meteorological profiles in different layers of the atmosphere have on surface transmission loss and to assess the impact of varying these profiles. Wind shear is found to be most impactful and it becomes clear that knowing the vertical wind profile is essential for determining the source of a received infrasonic signal. If wind shear is weak or non-existent, however, knowing the lapse rate in low altitudes to a high degree of accuracy is necessary. An in depth discussion and analysis of these results are presented as well as an overview of the infrasound propagation model and simplified meteorological profiles used in this study.","abstract_html":"A deep understanding of the impact of the natural environment on local (&lt; 150 km) infrasound propagation is important, specifically for persistent infrastructure monitoring. Passively sensing the infrasound field provides useful information about the condition of infrastructure or any activity of interest in the infrasound passband. Meteorological profiles strongly influence the propagation of an infrasound signal via refraction; therefore, understanding the effects of different profiles is crucial for both determining the source of a signal and estimating how far away that signal may be readily detected. This paper focuses on simplified vertical temperature and wind profiles up to 20 km altitude and their effect on an infrasonic signal emanating from an arbitrary point source. A wide-angle, finite-element infrasound propagation model that correctly handles discontinuities in wavenumber is used for calculating transmission loss. A large number of simulations were performed to investigate the effect that meteorological profiles in different layers of the atmosphere have on surface transmission loss and to assess the impact of varying these profiles. Wind shear is found to be most impactful and it becomes clear that knowing the vertical wind profile is essential for determining the source of a received infrasonic signal. If wind shear is weak or non-existent, however, knowing the lapse rate in low altitudes to a high degree of accuracy is necessary. An in depth discussion and analysis of these results are presented as well as an overview of the infrasound propagation model and simplified meteorological profiles used in this study.","abstract_has_math":false,"creators":["Lammers, Andrew R"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":["Rauber, Robert M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:17:59Z","date_published":"2018-09-27T16:17:59Z","updated_at":"2026-07-22T22:24:40Z","subjects":["infrasound propagation","atmospheric profiles","local infrasound"],"languages":["en"],"rights":["Copyright 2018 Andrew Lammers"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101618","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rauber, Robert M."]},{"key":"dc:creator","label":"Author","values":["Lammers, Andrew R"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:17:59Z","2018-07-18","2018-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Atmospheric Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["infrasound propagation","atmospheric profiles","local infrasound"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Andrew Lammers"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101618"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["A deep understanding of the impact of the natural environment on local (< 150 km) infrasound propagation is important, specifically for persistent infrastructure monitoring. Passively sensing the infrasound field provides useful information about the condition of infrastructure or any activity of interest in the infrasound passband. Meteorological profiles strongly influence the propagation of an infrasound signal via refraction; therefore, understanding the effects of different profiles is crucial for both determining the source of a signal and estimating how far away that signal may be readily detected. This paper focuses on simplified vertical temperature and wind profiles up to 20 km altitude and their effect on an infrasonic signal emanating from an arbitrary point source. A wide-angle, finite-element infrasound propagation model that correctly handles discontinuities in wavenumber is used for calculating transmission loss. A large number of simulations were performed to investigate the effect that meteorological profiles in different layers of the atmosphere have on surface transmission loss and to assess the impact of varying these profiles. Wind shear is found to be most impactful and it becomes clear that knowing the vertical wind profile is essential for determining the source of a received infrasonic signal. If wind shear is weak or non-existent, however, knowing the lapse rate in low altitudes to a high degree of accuracy is necessary. An in depth discussion and analysis of these results are presented as well as an overview of the infrasound propagation model and simplified meteorological profiles used in this study.","Submission original under an indefinite embargo labeled 'Open Access'. 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Passively sensing the infrasound field provides useful information about the condition of infrastructure or any activity of interest in the infrasound passband. Meteorological profiles strongly influence the propagation of an infrasound signal via refraction; therefore, understanding the effects of different profiles is crucial for both determining the source of a signal and estimating how far away that signal may be readily detected. This paper focuses on simplified vertical temperature and wind profiles up to 20 km altitude and their effect on an infrasonic signal emanating from an arbitrary point source. A wide-angle, finite-element infrasound propagation model that correctly handles discontinuities in wavenumber is used for calculating transmission loss. A large number of simulations were performed to investigate the effect that meteorological profiles in different layers of the atmosphere have on surface transmission loss and to assess the impact of varying these profiles. Wind shear is found to be most impactful and it becomes clear that knowing the vertical wind profile is essential for determining the source of a received infrasonic signal. If wind shear is weak or non-existent, however, knowing the lapse rate in low altitudes to a high degree of accuracy is necessary. An in depth discussion and analysis of these results are presented as well as an overview of the infrasound propagation model and simplified meteorological profiles used in this study.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Andrew Lammers, accepted the attached license on 2018-07-18 at 12:54.","The student, Andrew Lammers, submitted this Thesis for approval on 2018-07-18 at 13:37.","This Thesis was approved for publication on 2018-07-18 at 16:43.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12925 on 2018-09-27 at 10:49:20","Made available in DSpace on 2018-09-27T16:17:59Z (GMT). No. of bitstreams: 3 LAMMERS-THESIS-2018.PDF: 33515957 bytes, checksum: 0d1d0907689314ea6e2295450ecec0d0 (MD5) Thesis-Masters-AndrewLammers.docx: 31441057 bytes, checksum: df37159cbce000f52f499b3e59768eb2 (MD5) LICENSE.txt: 4211 bytes, checksum: e8f6a861e932bc91bed17a13737323b2 (MD5) Previous issue date: 2018-07-18"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101618"],"dc:language":["en"],"dc:rights":["Copyright 2018 Andrew Lammers"],"dc:subject":["infrasound propagation","atmospheric profiles","local infrasound"],"dc:title":["Effects of atmospheric profiles on local infrasound propagation"],"dc:type":["text"],"thesis:degree_discipline":["Atmospheric Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:40Z"}