50th aspng congress · presentation outline. 1. png tidal characteristics & types of tg’s on...
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50TH ANNUAL ASPNG CONGRESS
27th – 29th July, 2016Gateway Hotel, Port Moresby
SIGNIFICANCE OF TIDE GAUGES TO HYDROGRAPHY & SEA LEVEL MONITORING IN PNG.
By Derick Petrus: Hydrographer (B.Sc Surv)
NMSA-Maritime & Waterways Safety Project
Email: [email protected]: 711 79186 (mob)
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Presentation Outline1. PNG Tidal Characteristics & Types of TG’s on the market
today
2. NMSA RTG PNG Network integrated system operation, interactive Graphical display & accuracy of resolvable of tidal datasets.
3. RTG use in sea level monitoring in the context of Global warming
4. RTG’s require stable BENCH MARKS
Conclude with QUESTIONS ?..................
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Eg; Pom, kimbe, Alotau, Lae exhibit semi-diurnal
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Tide Gauge
Systems
A. Tide Pole
B. Pressure System 1. Bubbler gauges
2. Submerged gauges
C. Mechanical Float Systems/Stilling Well
D. Acoustic SystemsUltrasound
E. Radar Systems1. Pulse radar
2. CFMW
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POM Port Lae Port Kimbe Port Alotau Port
Vanimo Port Madang Port Manus Port Buka Port
DATAMAR 3000C 26 GHZ
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Continue…1. Environmental conditions
(signal not attenuated)
2. Surface conditions
3. Spread Angle
4. Measurable depth of water
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A. BENCH MARK CHECK:
Station BS HI FS ELEV REMARKSBM 2 1.552 5.892 4.340 LATTGBM 2.078 3.814RETURN RUN (CHECK)TGBM 2.098 5.912 3.814
1.569 4.343
Check = initial - final
= 4.343 - 4.340
= 0.003m
Therefore, the TGBM level = 3.814m
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Webtrans, online we based app
Datagraph
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PARTICIPATING GLOSS COUNTRIES
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4. RTG importance to sea level monitoring and updating of MSL in the context of global
warming.
Tidal data of accuracy of less than <10mm
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GLOSS NETWORK
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5. TG’s are useless without Bench Marks
Whatever the tide gauge used the Need for datum control
NMSA has resolved to using 5 stable bench marks, with one as the main BM for datum
control.
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Questions???
THE END……
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NMSA IFB FOR HYDROGRAPHIC SURVEY