Accession Number : ADA283721

Title :   A Modal Analysis of Currents in a Pacific Atoll Lagoon.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Palmer, Burton T.

Report Date : JUN 1994

Pagination or Media Count : 178

Abstract : The results of an initial quantitative study to define the physical oceanography of Johnston Atoll's lagoon circulation is presented. A bathymetric data base of the Island has been manually digitized from Navigational charts. A numerical model designed to predict the seiche modes of basins in two and three dimensions, in elliptic and Cartesian coordinates is developed, which seems to represent accurately the free modes of oscillation observed in current meter records. The numerical model is suitable for applications using a personal computer equipped with MATLAB (4.0) or later, and has applicability to basins of arbitrary shape in two dimensions, and rectangular, elliptical or circular symmetry in three dimensions. An analysis of currents within the lagoon at Johnston Atoll shows highly polarized tidal flow, phase locked to the diurnal tide. Spectral energy content of current meter records show six fundamental oscillatory modes and harmonics of tidal components. Johnston atoll, Seiche, Circulation, Modal analysis, Oscillation numerical

Descriptors :   *ATOLLS, *COMPUTER PROGRAMS, *OCEAN MODELS, *OCEAN CURRENTS, CARTESIAN COORDINATES, CHARTS, CIRCULAR, CIRCULATION, COMPUTERS, COORDINATES, DATA BASES, ENERGY, FLOW, HARMONICS, ISLANDS, MICROCOMPUTERS, OCEANOGRAPHY, OSCILLATION, PHASE, RECORDS, SHAPE, SYMMETRY, TIDES, BATHYMETRY, PREDICTIONS, MATHEMATICAL MODELS, THESES, OCEANOGRAPHIC DATA.

Subject Categories : Physical and Dynamic Oceanography
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE