Accession Number:

ADA445814

Title:

Assimilation of SAR Imagery in a Nearshore Spectral Wave Model

Descriptive Note:

Final rept., 6 Mar 2003-31 Dec 2005

Corporate Author:

GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS DIV ANN ARBOR MI

Personal Author(s):

Report Date:

2006-03-01

Pagination or Media Count:

39.0

Abstract:

This report describes a variational-calculus-based methodology for assimilation of data into a near-shore spectral wave model. Application of the methodology to both in-situ and SAR-image data are described. The use of the assimilation procedure to estimate both the wave field and the bottom friction coefficient are demonstrated for the region near the USACE Field Research Facility in Duck, NC. Results for assimilation of in-situ data show good agreement with independent wave spectrum observations. Assimilation of SAR-image data yields good agreement also however, wave energy at high frequencies and large propagation angles relative to the SAR look direction is lost. This is due to well-known SAR-imaging effects. Results for estimation of the bottom-friction coefficient using SAR imagery indicate that this is feasible, but additional development work is required.

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation
  • Theoretical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE