3 ms·
I have experience working with directional waverider buoys, and ultimately what is useful to me is a statistical representation of sea conditions for a given pe
by cr1895 10y ago
I have experience working with directional waverider buoys, and ultimately what is useful to me is a statistical representation of sea conditions for a given period (typically 3 hours). I could obtain the raw timeseries of accelerations from the buoy but this is really much less interesting than the rolling spectral statistics that are processed by and output by the buoy.
- dandelany 10y agoThen use a 3-hour moving average of the timeseries... This does not imply one data point per 3 hours, the rolling average timeseries interval can be (& generally is) far more granular than the window size of the average.
- cr1895 10y agoI think you're not understanding me, or I'm not understanding you...unless for some specific reason you want to know a wave elevation timeseries (which given the question "how do I describe the current sea conditons" you probably don't; also, noting that significant wave height is not the same as wave elevation), the statistical parameters which are derived from the timeseries data are more useful. These of course can be given on a rolling basis.
- dandelany 10y agoYes, I think I misunderstood you originally - and instead of trying to explain it, I'll just say thanks for the thoughtful follow-up posts :)
- cr1895 10y agoTo comment on the other measurements (temp, pressure, wind spd/dir): these are different from Hs in that Hs is by definition a statistical parameter; it is 4*stdev of the wave elevations or more practically the mean of the highest third of measured wave heights. You could have higher granularity of temperature, pressure, etc. which arguably more precisely tells you about those conditions at a given time, but a more granular time series of Hs does not necessarily define the sea state any better.
- cr1895 10y agoAnd coincidentally Hs corresponds well to visually estimated wave height.