Nearshore Airborne Lidar Observations

Abstract

Hwang et al. (1999a and 1999b) uses standard FFT procedures to estimate deep water 2-dimensional wavenumber spectra from lidar images. The characteristic wavelength analyzed is O(100m), homogeneity scale is O(10km) and wave evolution scale is O(100km). Knowledge of the local bathymetry allows, via the linear dispersion relation is needed for retrieving frequency-directional spectrum. The classical Fourier transform approach (FT) fails in the nearshore region due to the strong spatial inhomogeneities of the wavefield, generated by lower order wave-bathymetry and quadratic wave-wave interaction. Shoaling waves evolve much faster than deep-water waves, over O(1km) scales (Elgar and Guza, 1985). Other approaches, such as wavelet transforms, have been ocasionally used in ocean wave data analysis. The method is. relatively new and its physical interpretation has yet to be set on a solid basis.

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Document Details

Document Type
Technical Report
Publication Date
Aug 08, 2001
Accession Number
ADA393108

Entities

People

  • Alexandru Sheremet

Organizations

  • Scripps Institution of Oceanography

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bathymetry
  • Data Analysis
  • Deep Water
  • Differential Equations
  • Directional
  • Dispersion Relations
  • Equations
  • Fluids
  • Frequency
  • Observation
  • Ocean Waves
  • Spectra
  • Two Dimensional
  • Water
  • Water Waves
  • Wavelet Transforms
  • Waves

Fields of Study

  • Environmental science

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Coastal Oceanography