Evaluation of an acoustic Doppler profiler with application to stratified flow in a fjord

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dc.contributor.authorZedel, Leonard Jamesen_US
dc.date.accessioned2024-08-15T20:20:13Z
dc.date.available2024-08-15T20:20:13Z
dc.date.copyright1985en_US
dc.date.issued1985
dc.degree.departmentDepartment of Physicsen_US
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractIn this thesis, the incoherent Doppler profiling technique for remote current measurement in the ocean is evaluated. The fundamentals of Doppler profiling are analyzed in detail and the practical application of the technique is discussed. The single beam Institute of Ocean Sciences (IOS) prototype Doppler profiler is investigated, both with theoretical models of its signal processing circuit and with laboratory and field tests of its operational characteristics. Some time series analysis techniques useful in evaluating the Doppler signal are discussed. The performance of three mean frequency estimators are compared: it is found that the complex covariance method and the scalar phase change method produced accurate estimates, but the vector phase change method yields standard deviations 1.4 times higher than the other methods. The standard deviation of the complex covariance method is shown to depend on the choice of time lag. In agreement with a previous theoretical study (Miller and Rochwarger 1972), it is found that the use of small time lags does not provide the smallest standard deviations. Several data averaging schemes are compared, and, based on the results of this comparison an acceptable scheme for use in coastal waters is selected. As an example of the application of the Doppler profiler, tidal flows occurring over Observatory Inlet sill are investigated. The observations demonstrate the detail with which such a flow can be studied using acoustic remote sensing techniques. The observations are compared to a time-dependent, layered hydraulic model of flow over a sill. The agreement between flow simulated by the model and the Doppler observations indicates that the hydraulic analysis of such a flow accounts for many of the observed characteristics. This comparison serves to illustrate the value of the Doppler measurement approach in highly variable flows.
dc.format.extent197 pages
dc.identifier.urihttps://hdl.handle.net/1828/20264
dc.rightsAvailable to the World Wide Weben_US
dc.titleEvaluation of an acoustic Doppler profiler with application to stratified flow in a fjorden_US
dc.typeThesisen_US

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