{"id":{"repo_id":"nps","oai_identifier":"oai:calhoun.nps.edu:10945/22006"},"canonical_url":"https://search.dev.ndltd.org/etd/nps/oai:calhoun.nps.edu:10945/22006","repository":{"repo_id":"nps","name":"Naval Postgraduate School","base_url":"https://calhoun.nps.edu/server/oai/request"},"display":{"title":"A numerical method for solving for normal modes with impedance bottom","abstract":"This thesis describes the development of a computer program that calculates the propagation loss for low frequencies in a shallow ocean given the depth of source and receiver, the sound speed profile of the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of impedance mismatch. An effort was made to develop a Fast Field Program, which would use a FFT to predict propagation loss at a variety of ranges by solving for a discrete set of wave numbers, but development was not completed.","abstract_html":"This thesis describes the development of a computer program that calculates the propagation loss for low frequencies in a shallow ocean given the depth of source and receiver, the sound speed profile of the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of impedance mismatch. An effort was made to develop a Fast Field Program, which would use a FFT to predict propagation loss at a variety of ranges by solving for a discrete set of wave numbers, but development was not completed.","abstract_has_math":false,"creators":["Cantley, Douglas"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Engineering Acoustics Academic Committee","school":null,"contributors":[],"advisors":["Coppens, Alan B.","Gabrielson, Thomas B."],"committee_chairs":[],"committee_members":[],"year":1986,"date_issued":"1986-12","date_published":"1986-12","updated_at":"2026-07-27T20:25:20Z","subjects":[],"languages":["en_US"],"rights":["Copyright is reserved by the copyright owner"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10945/22006","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Coppens, Alan B.","Gabrielson, Thomas B."]},{"key":"dc:contributor.department","label":"Department","values":["Engineering Acoustics Academic Committee"]},{"key":"dc:creator","label":"Author","values":["Cantley, Douglas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["December 1986"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2012-11-27T00:17:39Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2012-11-27T00:17:39Z"]},{"key":"dc:date.issued","label":"Date","values":["1986-12"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is reserved by the copyright owner"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10945/22006"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis describes the development of a computer program that calculates the propagation loss for low frequencies in a shallow ocean given the depth of source and receiver, the sound speed profile of the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of impedance mismatch. An effort was made to develop a Fast Field Program, which would use a FFT to predict propagation loss at a variety of ranges by solving for a discrete set of wave numbers, but development was not completed."]},{"key":"dc:title","label":"Title","values":["A numerical method for solving for normal modes with impedance bottom"]}]}],"canonical_facts":{"dc:contributor.advisor":["Coppens, Alan B.","Gabrielson, Thomas B."],"dc:contributor.department":["Engineering Acoustics Academic Committee"],"dc:creator":["Cantley, Douglas"],"dc:date":["December 1986"],"dc:date.accessioned":["2012-11-27T00:17:39Z"],"dc:date.available":["2012-11-27T00:17:39Z"],"dc:date.issued":["1986-12"],"dc:description.abstract":["This thesis describes the development of a computer program that calculates the propagation loss for low frequencies in a shallow ocean given the depth of source and receiver, the sound speed profile of the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of impedance mismatch. An effort was made to develop a Fast Field Program, which would use a FFT to predict propagation loss at a variety of ranges by solving for a discrete set of wave numbers, but development was not completed."],"dc:identifier.uri":["https://hdl.handle.net/10945/22006"],"dc:language.iso":["en_US"],"dc:rights":["Copyright is reserved by the copyright owner"],"dc:title":["A numerical method for solving for normal modes with impedance bottom"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:25:20Z"}