Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8866863 | Remote Sensing of Environment | 2018 | 9 Pages |
Abstract
The ability to measure real time surface elevation over a large spatial domain offers large benefits to multiple industries, including offshore operations and marine renewable applications. In combination with a real time short-term wave prediction model safety related marine operations windows can be increased. This focuses on Quiescent Period Prediction during large sea states, and the ability of pre-emptive wave-by-wave tuning of marine energy converters leads to improved efficiencies. This study presents a new method of converting X-band radar sequence into approximate surface elevation in near real time using synthetic wave trough profile estimations, forgoing the use of a linear stochastic model. The artificial wave trough method applies a second order Stokes wave to trough regions where radar shadows occur, these shadows are caused as a result of high surround wave crest height where no surface information is gathered. The calculated surface elevation is validated against in situ sensor data at two locations, a correlation (r) of 0.69 is shown for the Signature 1000 sensor location, while a lower correlation of 0.56 is observed at the wave buoy location. When the phase-averaged wave parameters (Hm0 and Tp) derived from 20Â min wave spectra for the entire duration of the measurement campaign are compared, a reasonable agreement of 0.62 and 0.41 for the AD2CP and wave buoy location is achieved. The presented method shows a good approximation of wave profile shape, where the swell component is predominantly measured, indicating the potential of X-band radar surface elevation measurements in near real time for nearshore inhomogeneous seas.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Computers in Earth Sciences
Authors
Charles Greenwood, Arne Vogler, James Morrison, Angus Murray,