Accession Number:

ADA551761

Title:

Airborne Measurement of the Space/Time Properties of Waves in the Coastal Zone

Descriptive Note:

Annual rept.

Corporate Author:

WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1998-01-01

Pagination or Media Count:

3.0

Abstract:

Our long-term goal in this project is to utilize a newly developed airborne microwave technique to monitor the propagation of waves from the deep ocean into the coastal zone. Our scientific objectives are to investigate the generation of forced waves produced by quadratic nonlinearities, the refraction of swell in shallow water, the possibility of determining bottom topography from refraction, and the effects of bottom topography and composition on the reflection and attenuation of swell waves propagating shoreward. Our approach is to fly a coherent real aperture radar CORAR on a NOAA Twin Otter aircraft to make images in a sidelooking mode of the waves propagating toward shore and to measure their directional spectra and the accompanying wind speed utilizing a simultaneous rotating mode. By obtaining wave spectra from both the imaging and rotating modes, we will obtain the dispersion behavior of any spectral peaks and thus determine the order of the interaction that produced them. We will also attempt to extract currents from CORARs rotating mode and compare them with currents simultaneously measured by a shore-based CODAR. We will fly along with two NOAA radiometers that will measure airwater temperature as well as wind speed and direction. Finally, we will fly in formation with a NOAA LongEZ airplane which will measure atmospheric turbulence and directional wave spectra at low altitude. We will compare our measurements with theirs.

Subject Categories:

  • Meteorology
  • Physical and Dynamic Oceanography
  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE