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Wave directional spreading from point field measurements.

M L McAllister1, V Venugopal1, A G L Borthwick1

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|May 10, 2017
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Summary

This study introduces a new method to estimate ocean wave spreading using single-point measurements, leveraging wave nonlinearity. This approach accurately captures wave directionality without needing multiple sensors, offering a promising tool for oceanographic data analysis.

Keywords:
directional spreading estimationin situ wave datapoint measurementsecond-order differencesurface gravity waves

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Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Wave Mechanics

Background:

  • Ocean waves possess multidirectional components, making single-point measurements insufficient for capturing directional information.
  • Conventional directional estimation methods require multiple spatial measurements, which are often impractical.

Purpose of the Study:

  • To utilize the relationship between wave nonlinearity and directionality for estimating local wave spreading.
  • To develop a method for estimating wave spreading from single-point measurements, avoiding the need for multiple concurrent time series.

Main Methods:

  • Applied Adcock & Taylor's (2009) method, which links wave nonlinearity to directionality, assuming frequency independence.
  • Utilized measurements from the North Alwyn platform in the northern North Sea.
  • Excluded data records containing freak waves for analysis.

Main Results:

  • The proposed method accurately estimates wave spreading across various conditions at the North Alwyn platform.
  • Results were validated against conventional measurement methods and hindcast data.
  • The technique proved effective even with noisy, chaotic ocean wave signals.

Conclusions:

  • Adcock and Taylor's method is applicable to metocean data for estimating wave spreading.
  • This single-point measurement technique shows significant promise for future oceanographic applications.
  • It offers a valuable alternative for recovering wave spreading information where traditional methods are not feasible.