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By Ms R. FARRE BSC SEA EGSSUPERINTENDENT TIDAL INFORMATION
SOUTH AFRICAN NAVY HYDROGRAPHIC OFFICE
OTT “KALESTO” RADAR TIDE GAUGE
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AIM
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SCOPE: RSA Tide Gauge Network Leveling the Transducer Surveying and Calibration
Benchmarks How to survey in a Tide Gauge Davit LOGOSENS reference level Long and short stay
HYDRAS3 WBSLAO – LOGOSENS operating program
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RSA TIDE GAUGE NETWORK
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LEVELING THE TRANSDUCER
THE TRANSDUCER NEEDS TO BE LEVELLED ON THE DAVIT Spirit level
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Surveying and Calibration Benchmarks How to survey in a Tide Gauge Davit LOGOSENS reference level Long and short stay
HYDRAS3 WBSLAO – LOGOSENS operating program
SCOPE: RSA Tide Gauge Network Leveling the Transducer
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SURVEYING AND CALIBRATION
AFTER INSTALLATION: Gauge must be levelled into local benchmark network and a
reference level programmed into the logosens.Must know
Exact height of benchmarks above LLD what LLD is.
IN RSA LLD = MSL = 0Anything above MSL is height or elevationAnything below MSL is a depth.
THUS BENCHMARKS ARE HEIGHTS ABOVE MSL CD IS LAT CD IS VALUE BELOW MSL
Durban CD is MSL – 0.913
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SURVEYING AND CALIBRATION
SO A BENCHMARKS HEIGHT CAN BE CONVERTED TO A HEIGHT ABOVE CD Height of benchmark above
MSL + CD for the port A + C = B
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SURVEYING AND CALIBRATION
IDENTIFY BENCHMARKS AND CHECK THEIR LOCATION WITH A SITE MAP (left)
BENCHMARK HEIGHTS CAN BE OBTAINED FROM LAND SURVEYOR TOWN PLANNERS
OFFICE
WF9 = MSL + 2.331mWF10 = MSL + 2.343mNEW GPS = MSL + 2.329m
Light
W F 8
NO
RT
H S
PU
R
New GP S
W F 9
W F 10
'A ' BERTH
N
TideGauge
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SURVEYING AND CALIBRATION
THE TRIPOD, WITH DUMPY, MUST BE POSITIONED ½ WAY BETWEEN EACH BENCHMARK.
THE TACH STAFF WILL BE PLACED ON THE BENCHMARK STUD
STUD
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SURVEYING AND CALIBRATION
SURVEYOR STANDS AT POSITIONS 1, 2 & 3
PERSON HOLDING THE TACH STAFF PLACES IT ON THE BENCHMARKS MARKED 1, 2, 3 & ON THE TIDE GAUGE TRANSDUCER AT 4
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SURVEYING AND CALIBRATION
YOU STAND AT 1 ASSISTANT AT 1
Take readings YOU TURN, WITHOUT
MOVING THE TRIPOD, TO 2
ASSISTANT MOVES TO 2 Take readings
YOU MOVE TO 2 ASSIATANT STAYS AT 2,
TURNING TO FACE YOU WITHOUT LIFTING THE TACH STAFF OFF THE BENCHMARK STUD
Take readings.
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SURVEYING AND CALIBRATION
YOU TURN, WITHOUT MOVING THE TRIPOD, TO 3
ASSISTANT MOVES TO 3 Take readings
YOU MOVE TO 3 ASSISTANT STAYS AT 3,
TURNING TO FACE YOU WITHOUT LIFTING THE TACH STAFF OFF THE BENCHMARK STUD
Take readings.
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SURVEYING AND CALIBRATION
YOU TURN, WITHOUT MOVING THE TRIPOD, TO 4
ASSISTANT MOVES TO 4 Take readings
Repeat this process “LEAP-FROGGING” back to where you will be taking reading with the tach staff on position 1
IF CORECTLY DONE: Forward = Backward
Forward Readings –
Backward Readings = 0
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SURVEYING AND CALIBRATION
WHEN PLACING THE TACH STAFF ON THE TRANSDUCER Always place it on the “black box” Never on the bracket.
YOU CAN GET THE STD TACH STAFF (1)
Graduations that can be read off manually
AND THE ELECTRONIC TACH STAFF (2)
Barcoded
(2)
(1)
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SURVEYING AND CALIBRATION
EXAMPLE OF SURVEY RESULTS FOR RICHARDS BAY, Northern Kwazulu Natal
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MEASUREMENTS OF THE “KALESTO” RADAR GAUGE
FROM TOP OF “BLACK BOX” TO THE TRANSDUCER FACE (Tx) IS 0.400m
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SURVEYING AND CALIBRATION
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SURVEYING AND CALIBRATION
RICHARDS BAY
SCH3
SAN84,2
Ht of above MSL 3.429 3.422
+ to TG 1.0571 1.0632
- less; to ref face -0.400 -0.400
Ref face above MSL 4.0861 4.0852
Add CD 1.015 1.015
Ref face above CD = 5.1011 5.1002
Av ht of ref face above CD = 5.101
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“KALESTO” RADAR GAUGE IN SITU (Richards Bay)
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“KALESTO” RADAR GAUGEPLATFORM FOR EASY ACCESS TO GAUGE DURING LEVELING AND
CALIBRATION. (Richards Bay)
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CALIBRATION OF “KALESTO”
Knysna
Simon’s Town
Richard’s Bay
East London
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CALIBRATING THE “KALESTO” RADAR GAUGE
Example of a calculation for check calibration of radar gauge, if A= 3.422m (known value for local benchmark)
Av. A above CD = Av B
Av A =MSL + 3.422
(D-B) = + 1.063
less E to Tx = - 0.400
Ref Face =MSL + 4.085
CD =MSL - 1.015
+5.100
Ht of Tx = 5.100m above CD
readings @ short stay:
5.100 - (2.750 - 0.400) = 2.750m readings @ long stay:
5.100 - (3.750 - 0.400) = 1.750m
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CALIBRATING THE “KALESTO” RADAR GAUGE
Program the reference level into the LOGOSENSWith RS232 cableCreate station in the
office before departure to the installation site.
Show how this is done with WBSLAO program
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CALIBRATING THE “KALESTO” RADAR GAUGE
AT SHORT STAY:From 1300B to 1900BNo values: 125Mean: 1.715m above CDThis is 0.035m LOW
ADD 0.035m to ref in LOGOSENS
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CALIBRATING THE “KALESTO” RADAR GAUGE
AT LONG STAY:From 1925B to 0900B
next dayNo values: 272Mean: 2.718m above CDThis is 0.032m LOW
ADD 0.032m to ref in LOGOSENS
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CALIBRATING THE “KALESTO” RADAR GAUGE
After resetting the reference level in the LOGOSENS
AT LONG STAY:From 0935B to 0955B No values: 7Mean: 2.753m above CDThis is 0.003m HIGH
This 3mm is perfectly acceptable to be out by.
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CALIBRATING THE “KALESTO” RADAR GAUGE
This is how the previous information would be displayed once it is downloaded for a longer period of time.
Calibration records are digitally stored in this method.
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SOME USEFUL TIPS
Always print weekly graphics.Errors can be noted and corrected timeously
Battery not working No power Telephone lines down
Assists with analysis of tides Shows “spikes” very clearly.
Insert your predictions into the HYDRAS3 programCheck accuracy of your predictions
Overlay actual and predictionsCan pick up time/ clock errors timeously
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OTT “KALESTO” RADAR TIDE GAUGE
SCOPE: RSA Tide Gauge Network Leveling the Transducer Surveying and Calibration
Benchmarks How to survey in a Tide Gauge Davit LOGOSENS reference level Long and short stay
HYDRAS3 WBSLAO – LOGOSENS operating program
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EXAMPLES OF HYDRAS3 GRAPHICS
NO POWER, BATTERY HAS NOT “KICKED” INData lost.
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EXAMPLES OF HYDRAS3 GRAPHICS
NO POWER, BATTERY HAS NOT “KICKED” INData lost. Clock stopped data out
of phase
RESET CLOCK IMMEDIATELY!
DATA WILL HAVE TO BE MOVED BACK INTO PHASE
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EXAMPLES OF HYDRAS3 GRAPHICS
TO REST THE CLOCKSelect refreshSelect set date/time
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EXAMPLES OF HYDRAS3 GRAPHICS
PREDICTIONS vs ACTUALS FOR DURBAN
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MULTIPLE GRAPHICS
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MULTIPLE GRAPHICS
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QUESTIONS?