August 2020 – TD 316 OPERATING MANUAL – Motus Wave Sensor 5729
Page 69
4.7.3
Processing Dependencies
Figure 4-22: Processing Dependencies in System Configuration
Water Depth
(m
)
is the total water depth where the buoy is located in meter. The default setting is 25 meter.
Gravity (m/s
2
)
is the local gravity constant in m/s
2
. The default value is 9.81m/s
2
High Frequency Limit (Hz
)
is the lower cut-off frequency in Hz. The default value is 0.7Hz= 1/0.7 = 1.42second, this is
also equal to the lowest wave period we can measure.
Low Frequency Limit (Hz)
is the higher cut-off frequency in Hz. The default value is 0.03333Hz = 1/0.3333 =
30seconds. The range is maximum 33seconds = 0.03030Hz.
Wave Integration Time
is the period the sensor use to calculate all wave parameters. Range is 5 minutes to 60
minutes and default is 30 minutes.
Timeseries record length
is the length of each timeseries. Range is 5minutes to 60 minutes and default is 30 minutes.
Swell Wind Separation Frequency (Hz)
is the frequency that separates wind from swell. Default value is 0.1Hz =10s.
Waves with period bellow 10s are then considered as wind generated sea and waves above 10s are considered as
swell.
