The Aquadopp Profiler (AquaPro) and AWAC can make two different types of measurements, Current Profiles and Wave Bursts. However, the legacy instruments cannot perform these two at the same time. If the two measurement types are scheduled at the same time the wave burst will take precedence and the current profile that overlap with the wave burst will not be measured. This happens if the wave interval is greater than the current velocity profile interval.
The lost current profile may be handled by a simple interpolation of its neighboring profiles in post-processing. Both when exporting data from the Storm processing software or when converting the raw data to ASCII data in the instrument software Profile interpolation can be enabled. The interpolation is fairly simple: The last current measurements taken before the wave interval started and the first current measurements taken after the wave measurements are added and divided by two. Note that this is only possible when there is just one current interval that are skipped. No interpolation is done if there are several skipped current intervals within the wave interval. If you do not want interpolated current values you can disable the choice before exporting the data.
The other important note to make regarding the scheduling/timing of the wave burst is that it occurs immediately after a current profile. This is because the wave measurement cycle requires pressure information from the current profile:
Figure 1: An example of a sampling scheme illustrating the skipped average interval.
Furthermore the wave burst is scheduled to occur at its specified interval. The interval is referenced at the end of the first current profile. Therefore there is a perceived “delay” with the wave measurement but this is simply the duration of profile measurement (or the Average Interval).
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