JANUARY 2010 - TD 220a DEPLOYMENT GUIDE, RDCP600
Page
59
Reliable solutions
Table 2-1 Minimum wave period to be measured
Deployment depth
[m]
Distance between
transducer beams at
the surface
[m]
Minimum wave
length,
m
Minimum wave
period, T [s]
1
g
T
2
6 6 12 3
10 10 20 3.6
15 14 28 4.2
20 19 38 4.9
25 24 48 5.5
30 28 56 6
Deployment depth when measuring the Wave Height and Period:
6 to 30 meters
More shallow installations preferable
Deployment depth when measuring the Wave Direction:
6 to 20 meters, however 6 to 12 meters is recommended
Shorter wave periods requires more shallow installations
Ocean swell can be pushed deeper (towards 20m)
More shallow installations preferable
Memory Usage:
The wave recording file for each recording interval is approximately 9.5 kb/min acoustic wave
duration (selected above). I.e. 10 minutes duration gives 95 kb per recording, while a 5 min
duration and 20 min recording interval stores approx 3.5 Mb per day.
Power Consumption:
When configuring acoustic based wave, please note that the instrument pings evenly during the
acoustic wave duration in 2 Hz intervals (2 samples per second). Hence, the longer the acoustic
wave duration, the higher the power consumption. If power consumption is an issue, please
reduce the acoustic wave duration.
1
g=9.81 m/s
2
