{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/111933"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/111933","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Interference and Transmission of locally forced internal waves in non-uniform stratifications","abstract":"Several studies have investigated the effect of constructive or destructive interference on the transmission of internal waves that propagate through non-uniform stratifications. Such studies have been performed for internal waves that are spatiotemporally harmonic. To understand the effect of spatiotemporal localization, this thesis presents a theoretical and experimental study of the transmission of two-dimensional internal waves that are generated by a boundary forcing that is localized in both space and time. This is done by considering an idealized problem and applying a weakly viscous semi-analytic linear model to it. After validation with a numerical model, the semi-analytic model allows us to perform parametric studies. Using theoretical studies, we show that localization leads to the disappearance of transmission peaks and troughs that would otherwise be present for a harmonic forcing. The laboratory experiments that we perform provide a clear indication of this physical effect. Based on the group velocity and angle of propagation of the internal waves, a practical criteria that assesses when the transmission peaks or troughs are evident, is obtained. It is found that there is a significant difference in the predicted energy transfer due to a harmonic and non-harmonic forcing which has direct implications to various physical forcings such as a storm over the ocean.","abstract_html":"Several studies have investigated the effect of constructive or destructive interference on the transmission of internal waves that propagate through non-uniform stratifications. Such studies have been performed for internal waves that are spatiotemporally harmonic. To understand the effect of spatiotemporal localization, this thesis presents a theoretical and experimental study of the transmission of two-dimensional internal waves that are generated by a boundary forcing that is localized in both space and time. This is done by considering an idealized problem and applying a weakly viscous semi-analytic linear model to it. After validation with a numerical model, the semi-analytic model allows us to perform parametric studies. Using theoretical studies, we show that localization leads to the disappearance of transmission peaks and troughs that would otherwise be present for a harmonic forcing. The laboratory experiments that we perform provide a clear indication of this physical effect. Based on the group velocity and angle of propagation of the internal waves, a practical criteria that assesses when the transmission peaks or troughs are evident, is obtained. It is found that there is a significant difference in the predicted energy transfer due to a harmonic and non-harmonic forcing which has direct implications to various physical forcings such as a storm over the ocean.","abstract_has_math":false,"creators":["Supekar, Rohit B"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Mechanical Engineering.","school":null,"contributors":[],"advisors":["Thomas Peacock."],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017","date_published":"2017","updated_at":"2026-07-22T22:21:21Z","subjects":["Mechanical Engineering."],"languages":["eng"],"rights":["MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/111933","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Thomas Peacock."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://dspace.mit.edu/handle/1721.1/7582"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1721.1/111933"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.","Cataloged from PDF version of thesis.","Includes bibliographical references (pages 61-63)."]},{"key":"dc:description.abstract","label":"Abstract","values":["Several studies have investigated the effect of constructive or destructive interference on the transmission of internal waves that propagate through non-uniform stratifications. Such studies have been performed for internal waves that are spatiotemporally harmonic. To understand the effect of spatiotemporal localization, this thesis presents a theoretical and experimental study of the transmission of two-dimensional internal waves that are generated by a boundary forcing that is localized in both space and time. This is done by considering an idealized problem and applying a weakly viscous semi-analytic linear model to it. After validation with a numerical model, the semi-analytic model allows us to perform parametric studies. Using theoretical studies, we show that localization leads to the disappearance of transmission peaks and troughs that would otherwise be present for a harmonic forcing. The laboratory experiments that we perform provide a clear indication of this physical effect. Based on the group velocity and angle of propagation of the internal waves, a practical criteria that assesses when the transmission peaks or troughs are evident, is obtained. It is found that there is a significant difference in the predicted energy transfer due to a harmonic and non-harmonic forcing which has direct implications to various physical forcings such as a storm over the ocean."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.M."]},{"key":"dc:title","label":"Title","values":["Interference and Transmission of locally forced internal waves in non-uniform stratifications"]}]}],"canonical_facts":{"dc:contributor.advisor":["Thomas Peacock."],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Mechanical Engineering."],"dc:contributor.other":["Massachusetts Institute of Technology. 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This is done by considering an idealized problem and applying a weakly viscous semi-analytic linear model to it. After validation with a numerical model, the semi-analytic model allows us to perform parametric studies. Using theoretical studies, we show that localization leads to the disappearance of transmission peaks and troughs that would otherwise be present for a harmonic forcing. The laboratory experiments that we perform provide a clear indication of this physical effect. Based on the group velocity and angle of propagation of the internal waves, a practical criteria that assesses when the transmission peaks or troughs are evident, is obtained. It is found that there is a significant difference in the predicted energy transfer due to a harmonic and non-harmonic forcing which has direct implications to various physical forcings such as a storm over the ocean."],"dc:description.degree":["S.M."],"dc:identifier.uri":["http://hdl.handle.net/1721.1/111933"],"dc:language.iso":["eng"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission."],"dc:rights.uri":["http://dspace.mit.edu/handle/1721.1/7582"],"dc:subject":["Mechanical Engineering."],"dc:title":["Interference and Transmission of locally forced internal waves in non-uniform stratifications"],"dc:type":["Thesis"]},"updated_at":"2026-07-22T22:21:21Z"}