Detiding Shipboard-Mounted ADCP Data: An Analysis of Model Data and Observations Using a Polynomial Interpolation Method.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1994
- Accession Number
- ADA293151
Entities
People
- Marc T. Steiner
Organizations
- Naval Postgraduate School