Accession Number : ADA265663


Title :   Preliminary Estimates of Frequency-Direction Spectra Derived from the Samson Pressure Gage Array, November 1990 to May 1991


Descriptive Note : Draft rept.


Corporate Author : COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS


Personal Author(s) : Long, Charles E ; Guza, Robert T ; Herbers, Thomas H ; Oltman- Shay, Joan M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265663.pdf


Report Date : Sep 1991


Pagination or Media Count : 90


Abstract : In the course of the SAMSON (Sources of Ambient Micro-Seismic Noise) Experiment conducted by researchers from Scripps Institution of Oceanography at the Coastal Engineering Research Center (CERC) Field Research Facility (FRF) near Duck, NC, a two-dimensional array of 24 bottom-mounted sensors was deployed near the 13-m depth contour to detect the weekly depth-attenuated pressure signal arising from the interaction of directionally opposed wave trains. The geometry of the array was ideal for wind wave directional spectral estimation in the 0.05 to 0.24 Hz frequency band. The formal SAMSON experiment took place in October and early November 1990, but data collection continued until June 1991. Data from this post-experiment period were made available to CERC and were subsequently processed with a 360-degree Maxi Likelihood Estimation algorithm to determine the general character of the local wave field, including specifically any indications of significant seaward-propagating wind wave energy. This report contains a description of the SAMSON array, the type of data collected, and the analysis algorithm. It contains displays, both graphic and tabular, of relevant wind wave parameters deduced from the analysis. A means of acquiring the processed data, available to the general public after June 1994, is also described.


Descriptors :   *OCEAN WAVES , *PRESSURE GAGES , *AIR WATER INTERACTIONS , *UNDERWATER ACOUSTICS , ALGORITHMS , FREQUENCY , INTERACTIONS , MAXIMUM LIKELIHOOD ESTIMATION , WIND , RESEARCH FACILITIES , FREQUENCY BANDS , AMBIENT NOISE , COASTAL ENGINEERING , NOISE , GEOMETRY , SEISMIC WAVES , CLIMATE , PRESSURE , SIGNALS , SPECTRA , CONTOURS , OCEANOGRAPHY , DIRECTIONAL , PRESSURE MEASUREMENT , DEPTH , ARRAYS , ENERGY , TWO DIMENSIONAL , DATA PROCESSING , COASTAL REGIONS


Subject Categories : Physical and Dynamic Oceanography
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE