This is a deep water comparsion between a Teledyne RD Instruments Workhose Sentinel 300khz ADCP and a Rowe Technologies Inc. SeaWATCH 300kHz ADCP. All are equipped with 4 beams. This comparision uses two version of the SeaWATCH 300kHz: the standard 3in and the Long Range 5.25in ADCP. This will also demonstrate increased range of Rowe Technologies Inc. long range 300 kHz SeaWATCH compared to standard SeaWATCH 300 kHz ADCP’s in deep water.

Teledyne RD Instruments Workhorse Sentinel 300khz

VS

Rowe Technologies Inc SeaWATCH 300kHz

VS

Rowe Technologies Inc SeaWATCH 300kHz Long Range

Location

Deep water location: Japan, Tateyama Bay

Installation

Mooring Schematic

Configuration

All systems were programmed identically

• Ping times were offset to prevent interference.
• 6 minute ensembles, 60 pings, 1Hz ping rate.
• Four meter bins.
• 3in systems deployed on common depth gradient line.
• Deployed 25 meters off the bottom.
• Default screening thresholds were used.

Results

Overall Results

Sentinel vs SeaWATCH Results

The data analysis shows that the RoweTech SeaWATCH 300 and the Teledyne Sentinel 300 both make the same measurement under identical conditions in deep and shallow water. The RoweTech system shows an overall higher signal to noise return than the Sentinel. This contributes to increased range in normal conditions, or better sensitivity in regions or times when there is less backscatter.

Water Velocity Magnitude

Water Velocity Direction

Water East Velocity

Water North Velocity

Water Vertical Velocity

Water Error Velocity

Correlation

Echo Intensity (Amplitude)

Conclusion

The data analysis shows that the SeaWATCH 300 long range ADCP gives superior range to the standard versions. This system was moored at 175 meters and we would expect range in Broadband mode to exceed 200 meters and in narrowband mode to exceed 230 meters when deployed in similar conditions to this test. Both versions can make the same measurement in deep and shallow water. The RoweTech systems show an overall higher signal to noise return than the Sentinel. This contributes to increased range in normal conditions, or better sensitivity in regions or times when there is less backscatter.