Accession Number : ADA293151

Title :   Detiding Shipboard-Mounted ADCP Data: An Analysis of Model Data and Observations Using a Polynomial Interpolation Method.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Steiner, Marc T.

PDF Url : ADA293151

Report Date : DEC 1994

Pagination or Media Count : 96

Abstract : A method for determining the net non-tidal flow from shipboard-mounted acoustic Doppler current profiler (ADCP) data is applied to observations from the Gulf of the Farallones in 1991- 2. Tidal currents represent a significant portion of the total flow in the region Both the tidal and non-tidal current fields are characterized by spatial and temporal variability on small scales. The detiding method performs a least-squares fit to determine the spatial structure of both the amplitudes of the major tidal constituents and the magnitude of the non-tidal flow. Synthetic data is used to examine the requirements and constraints in choosing the best polynomial fitting function for each of the fields components. Arbitrarily choosing a higher-order polynomial to represent these fields may result in misrepresentation of the true flow. Results of applying this technique to vertically-averaged ADCP data from five seasonal surveys of approximately five-day duration are presented. (AN)

Descriptors :   *OCEANOGRAPHIC DATA, *TIDAL CURRENTS, MATHEMATICAL MODELS, SPATIAL DISTRIBUTION, GULFS, COASTAL REGIONS, OCEAN CURRENTS, THESES, CONTINENTAL SHELVES, BATHYMETRY, FLOW FIELDS, SEASONAL VARIATIONS, POLYNOMIALS, INTERPOLATION, LEAST SQUARES METHOD, OCEAN MODELS, DIURNAL VARIATIONS, FITTING FUNCTIONS(MATHEMATICS), OCEAN TIDES, STEADY FLOW.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE