The Interpretation and Validation of Measurements of the Ocean Wave Directional Spectrum

  • Lucy R. Wyatt
Conference paper

Abstract

This paper discusses the problems that arise in interpreting and validating new technologies for the measurement of the directional spectrum of the ocean surface. Remote sensing techniques, from the ground or satellites, are under development but, in general, they require detailed numerical inversion methods to extract the wave information and hence need to be carefully validated. The more established measurement techniques, e.g. buoys, are themselves not perfect and do not measure the full spectrum, and these limitations needs to be taken into account in any validation work. The issues raised are discussed with reference to intercomparisons between HF radar and wave buoy measurements. By combining different intercomparison methods the limitations of the HF radar measurement are more clearly identified.

Keywords

Entropy Microwave Radar Assure Remote Sensing 

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References

  1. Atanga, J. & Wyatt, L. R. (1997). Comparison of inversion algorithms for HF radar wave measurements. IEEE Journal of Oceanic Engineering, 22, 593–603CrossRefGoogle Scholar
  2. Bauer, E. & Heimbach, P. (1999). Annual validation of significant wave heights of ERS-1 synthetic aperture radar wave mode spectra using TOP- EX/Poseidon and ERS-1 altimeter data. Journal of Geophysical Researches C, 104, 13345–13357CrossRefGoogle Scholar
  3. Borge, J. C. N., Reichert K. & Dittmer, J. (1999). Use of nautical radar as a wave monitoring instrument. Coastal Engineering, 37, 331–342CrossRefGoogle Scholar
  4. Caires, S. (2000). Comparative study of HF radar measurements and wave model hindcasts in shallow waters. PhD thesis, University of SheffieldGoogle Scholar
  5. Capon, J. (1969). High resolution frequency wavenumber spectrum analysis. Proceedings of the IEEE, 57, 1408–1418CrossRefGoogle Scholar
  6. Donelan, M. A., Drennan W. M. & Magnussen, A.K. (1996). Nonstationary analysis of the directional properties of propagating waves. Journal of Physical Oceanography, 26, 1901–1914CrossRefGoogle Scholar
  7. Günther, H., Gurgel, K.-W., Evensen, G., Guddal, J., Nieto Borge, J.-C. & Wyatt, L. R. (2000). European radar ocean sensing. Proceedings of EurOCEAN 2000, Hamburg, 2000, 443–448Google Scholar
  8. Hashimoto, N. (1997). Analysis of the directional wave spectrum from wave data. Advances in Ocean and Coastal Engineering, 3, 103–143CrossRefGoogle Scholar
  9. Hasselman, K. & Hasselman, S. (1991). On the non-linear mapping of an ocean wave spectrum into a Synthetic Aperture Radar image spectrum and its inversion. Journal of Geophysical Research-C, 96, C6,10713–10729CrossRefGoogle Scholar
  10. Junger, S. (1998). The Perfect Storm. Fourth Estate, LondonGoogle Scholar
  11. Isaac, F. E. & Wyatt, L. R. (1997). Segmentation of HF radar measured directional wave spectra using the Voronoi Diagram. Journal of Atmospheric and Oceanic Technology, 14, 950–959CrossRefGoogle Scholar
  12. Kingsley, S. P., Blake, T. M., Fisher, A. J., Ledgard, L. J. & Wyatt, L. R. (1997). Dual HF radar measurements of sea waves from straight coastlines. Proceedings of the 7th International Conference on HF radio systems and techniques, Nottingham, July 1997 (IEE, London UK)Google Scholar
  13. Krogstad, H. E., Wolf, J., Thompson, S. P. & Wyatt, L. R. (1999). Methods for the intercomparison of wave measurements. Coastal Engineering, 37, 235–258.127CrossRefGoogle Scholar
  14. Krogstad, H. E. & Barstow, S. F. (1999). Satellite wave measurements for coastal engineering applications. Coastal Engineering, 37, 283–308CrossRefGoogle Scholar
  15. Lygre, A. & Krogstad, H. E. (1986). Maximum entropy estimation of the directional distribution in ocean wave spectra. Journal of Physical Oceanography, 16, 2052–2060CrossRefGoogle Scholar
  16. Sova, M. G. (1995). The sampling variability and the validation of high frequency wave measurements of the sea surface. PhD thesis, University of SheffieldGoogle Scholar
  17. Tucker, M. J. (1991). Waves in Ocean Engineering: Measurement, Analysis, Interpretation. Ellis Horwood series in Marine ScienceGoogle Scholar
  18. Wyatt, L. R. (2000). Limits to the inversion of HF radar backscatter for ocean wave measurement. Journal of Atmospheric and Oceanic Technology, 17, 1651–1666CrossRefGoogle Scholar
  19. Wyatt, L. R. & Holden, G. J. (1992). Developments in ocean wave measurement by HF radar. IEE Proceedings-F, 139, 170–174Google Scholar
  20. Wyatt, L. R. & Holden, G. J. (1994). Limits in direction and frequency resolution for HF radar ocean wave directional spectra measurement. The Global Atmosphere and Ocean System, 2, 265–290Google Scholar
  21. Wyatt, L. R. & Ledgard, L. J. (1996). OSCR wave measurement - some preliminary results. IEEE Journal of Oceanic Engineering, 21, 64–76CrossRefGoogle Scholar
  22. Wyatt, L. R. (1990). A relaxation method for integral inversion applied to HF radar measurement of the ocean wave directional spectrum. International Journal of Remote Sensing, 11, 1481–1494CrossRefGoogle Scholar
  23. Wyatt, L. R. (1991). HF radar measurements of the ocean wave directional spectrum. IEEE Journal of Oceanic Engineering, 16, 163–169CrossRefGoogle Scholar
  24. Wyatt, L. R. (1995). High order nonlinearities in HF radar backscatter from the ocean surface. IEE proceedings-Radar, Sonar and Navigation, 142, 293–300CrossRefGoogle Scholar
  25. Wyatt, L. R., Venn, J., Moorhead, M. D., Burrows, G. D., Ponsford, A. M. & van Heteren, J. (1986). HF radar measurements of ocean wave parameters during NURWEC. IEEE Journal of Oceanic Engineering, OE-11, 219–234CrossRefGoogle Scholar
  26. Wyatt, L. R., Gurgel, K-W., Peters, H. C., Prandle, D., Krogstad, H. E., Haug, O., Gerritsen, H., Wensink, G. J. (1998). The SCAWVEX Project: ocean wave measurement and analysis. Proceedings of WAVES 97, eds. Edge, B. L. & Hemsley, J. M., vol 2, 1457–1467Google Scholar
  27. Wyatt, L. R., Ledgard, L. J. & Anderson, C. W. (1997). Maximum likelihood estimation of the directional distribution of 0.53Hz ocean waves. Journal of Atmospheric and Oceanic Technology, 14, 591–603CrossRefGoogle Scholar
  28. Wyatt, L. R., Thompson, S. P. & Burton, R. R. (1999). Evaluation of HF radar wave measurement. Coastal Engineering, 37, 259–282CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Limited 2002

Authors and Affiliations

  • Lucy R. Wyatt
    • 1
  1. 1.Sheffield Centre for Earth Observation Science, Department of Applied MathematicsUniversity of SheffieldSheffieldUK

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