Post on 05-Aug-2020
Looking up – multi-
parameter bathymetry via an
amphibious,
autonomous bottom
crawler
ARNIS MANGOLDS
C-2I, INC.
SHREWSBURY, MA, USA
AMANGOLDS@C-2IINC.COM
978-257-4820
• Autonomous
• RF real time control option
• 10-20 mile range (UW)
• Amphibious
• 300-ft depth
• Configurable payload space
• Low
• profile
• ground pressure
• EM signature
• 100-day station keep
Bottom crawlers: Enabling technology
Sea Otter
• 36” x 24” x 10 “
• ~125-lbs
• On-deck payload 80-lbs
• 48” x 48” x 12 “
• ~250-lbs
• 850-lb on board payload • 800-lb drawbar
• 2 man lift • 55-lb max component
weight
• No tool assembly
Sea Ox
So what?
Provides a point of absolute
stability
Touches the ground
Independent of current
Can measure surface
roughness, density
Tides – no corrections
Sensor agnostic
Plenty of space for as many
sensors as can be fit
Can do work
Penetrate, sample, core
Navigation
• FOG
• AHRS
• Encoders
• GPS/RTK
• Pressure
• External aiding
259800
260000
260200
949550 949560 949570 949580 949590 949600 949610 949620 949630
Easting_Northing
Otter Y
259800
260000
260200
949610 949620 949630 949640 949650 949660 949670 949680 949690 949700 949710
Easting_Northing
RTK Survey Points SeaOtter.001
X-Y comparison with RTK
(Ship Island)
• 100Hz
• 0.2 cm
• 35 manual
vs 1500
vehicle pts
• .004” over
vehicle length
Gradient vs RTK
Back-up Bathymetry
measurements
Pressure
10hz
0.4-in
ADCP
RTK
Track sinkage
Trailer • Non-metallic
• Flex-EMI (by WRT)
• 5.5 x 2 x .5-ft:
• ~ 65-lbs, 5-ft tow bar
• 4-in coil to ground
clearance
• Field switchable tracks, skid,
wheels
Sample Playloads
Eel grass survey
Pond health
Fresh water
intrusion
Why of Interest?
Nearly sea state independent
Can do work
Penetrometers, coring
Sink gauge
Shear vanes
Caisson
Consumes no power for station keeping
Cross-diurnal/tidal cycles
Long term monitoring
No artificial boundaries
Crosses deep water, surf zone, soft ground, beach
Can multi-task
Coincident data
More of it
Low cost
Arnis Mangolds
amangolds@c-2iinc.com
978-257-4820