ChannelMaster Horizontal ADCP. ChannelMaster HADCP 2-beam Horizontal Broadband ADCP –Smaller cells...
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Transcript of ChannelMaster Horizontal ADCP. ChannelMaster HADCP 2-beam Horizontal Broadband ADCP –Smaller cells...
ChannelMaster Horizontal ADCP
ChannelMaster HADCP
• 2-beam Horizontal Broadband ADCP– Smaller cells– More cells– Lower noise– Lower power– Better data
ChannelMaster HADCPApplications
• Rivers – Index Velocity Method– Velocity, stage, discharge monitoring– Used where simple stage-discharge
relationship fails• Backwater• Tidal• Locked navigation channels• Pumped canal systems
ChannelMaster HADCPApplications
• Ports and Harbors and Waterways– Design – monitor currents before construction– Operation
• Vessel traffic safety - currents• Docking
ChannelMaster HADCPApplications
• Environmental– Velocity or flow triggered sampling– Velocity, flow warning
• Hydraulics Research– Circulation studies in lakes, estuaries– Large scale turbulence in rivers
ChannelMaster HADCPApplications
• Offshore– Monitor current near oil rigs or drill ships– Monitor current near mooring buoys– Research
ChannelMaster Description
• 2 profiling beams – x-y velocity components– 1-128 cells
• Select what is best for your application
– Narrow beam angle – ± 20 degrees• Increases range
– Better signal/noise ratio than 25 deg.
– Reduced boundary interference
• More homogeneous flow
ChannelMaster Description
• Standard sensors– Temperature – need for speed of sound– Pitch and Roll – need for installation– Depth
• 600 kHz vertical acoustic beam– ± 2mm accuracy
• Pressure – ‘reality check’ for acoustic
ChannelMaster Description
• Communications– RS-232/RS-422– SDI-12
• Standard - 27 values per measurement– One instrument at a time
• Concurrent – 20 values per request– Simultaneous instruments
ChannelMaster Description
• Internal 2 MB recorder• 9-18 Vdc power, external• 25 meter cable• Mounting plate included
– Allows removal and replacement without losing alignment
Competitor Comparison
Specification/Feature RDI
ChannelMaster Sontek
SL Nortek EasyQ
Processing Broadband Narrowband Narrowband
Maximum number of cells 128 standard 5 (optional upgrade) 3 (EasyQ or upgrade EasyV)
Minimum Cell Size 10, 20, 40 cm (1200, 600, 300kHz)
20, 40, 100 cm (3MHz,1.5MHz, 500kHz)
40, 80 cm (2MHz, 1MHz)
Maximum Range 20, 60, 200 m 8, 22, 120 m 10, 25 m
SDI-12 Concurrent, Basic Basic Basic
Record with SDI-12 on Yes Yes? No
Pressure sensor Standard Optional Optional
Acoustic stage Standard Optional, except on 500 kHz EasyQ only
Beam angle (degrees) 20 25 25
Beam width (degrees) 1.5, 1.5, 2.2 1.5, 1.5, 1.9? 1.7, 3.0 degrees
Memory 2 MB 4MB 2MB
Power 9-18V 9-16V 9-16
Why Buy RDI?
• Performance– Patented Broadband processing
• For same cell size, reach same accuracy in less time, with less energy
• For same energy, get better accuracy • Use smaller cells where necessary• Get more cells for detail if desired• >15 pings/second with 1200 kHz
– All beams pinged simultaneously
Why Buy RDI?
• Flexibility– One RDI can cover a wide range of
applications• Smaller minimum cells allows use in more shallow
water• More cells allows use in wider channels
Why Buy RDI?
• Versatility– 1200 kHz ChannelMaster matches or beats the maximum range
and minimum cell sizes of :• 1.5 and 3.0 MHz Sontek SL or • 1.0 and 2.0 MHz Nortek EasyQ/EasyV
– And allows use of up to 128 cells
– 600 kHz ChannelMaster matches or beats the maximum range and minimum cell sizes of
• 1.5 and 3.0 MHz Sontek SL or • 1.0 and 2.0 MHz Nortek EasyQ/EasyV
– And gives you up to 90 meter range
Why Buy RDI?
• Versatility– 300 kHz ChannelMaster matches or beats the
maximum range and minimum cell sizes of:• 500 kHz and 1.5 MHz Sontek SL• 1.0 and 2.0 MHz Nortek EasyQ/EasyV
– And gives you up to 300m range!
Range Comparisons
Horizontal Profiling Range
0.51
0.31
20.6
21.2
8
10
20
22
25
60
120
200
0 50 100 150 200 250
3000 SL
2000 EQ
1200 CM
1500 SL
1000 EQ
600 CM
500 SL
300 CM
Inst
rum
ent
Range (m)
Min Max
Why Buy RDI?
• Broadband ADCP Performance– Patented technique– Single ping standard deviation ~7 times better than
Narrowband using same cell size: i.e.: 50 narrowband pings = 1 broadband ping
– Less time, less energy, needed to reach desired accuracy – save money on solar cells and batteries.
– Inland applications are often low velocity: narrowband may need to average for minutes to achieve accurate result – this may cause a bias during changing flow conditions
Why Buy RDI?
• 20 degree beam angle– Fundamental assumption of constant flow at
any cell range– Good in open ocean, less good in rivers– Narrower beam angle reduces effects of
inhomogeneous flow – unmeasured and uncorrected bias. Most important at far end of range.
Who has them installed?
• China > 100
• Mexico > 120
• Great Britain > 25
• USA >70
• Mexico – specified after 6 month comparison vs Sontek