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dc.contributor.authorChurchill, James H.  Concept link
dc.date.accessioned2018-04-16T18:28:18Z
dc.date.available2018-04-16T18:28:18Z
dc.date.issued1981-05
dc.identifier.urihttps://hdl.handle.net/1912/10253
dc.description.abstractDuring July and August of 1980 near surface water velocities of Lake Huron were measured by tracking drogues, equipped with sonobuoys, using an acoustic travel time technique. Prior to these experiments difficulties associated with acoustic ray bending in the shallow, highly stratified environment were anticipated. Simple models were developed to predict the errors in drogue position and velocity determination resulting from ray bending. During the experiments round trip travel times of acoustic pulses transmitted between three bottom transponders and a transducer (lowered from a ship) were recorded. These combined with ray diagrams strongly suggested that, for a separation between the transducer and a bottom transponder of about 1.2 km, pulses which were detected first traveled by two paths, that of an inflected ray and that of a ray trapped beneath the thermocline. The error in position and velocity determination associated with these paths was 1 to 2%. Evidence also indicated that increased thermocline depth resulted in decreased tracking range.en_US
dc.description.sponsorshipPrepared for the Department of Energy under Contract DE-AC02-79EV10005 and for NOAA under Contract 03-5-022-26.en_US
dc.language.isoen_USen_US
dc.publisherWoods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Technical Reportsen_US
dc.relation.ispartofseriesWHOI-81-37en_US
dc.subjectUnderwater acousticsen_US
dc.subjectAcoustic drogue measurementsen_US
dc.titleTracking near surface drogues using an acoustic travel time technique in shallow, highly stratified water : problems and observationsen_US
dc.typeTechnical Reporten_US
dc.identifier.doi10.1575/1912/10253


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