Oceanographic Real-Time Measurement on Buoyancy Beacon Feedback in the Rhône Delta and Gulf of Fos Fruce France Pierre Gaufrès, B. Andres, and F. Dufois

Abstract  The instrumentation implanted since 2003 on two buoyancy beacons (BFI) in the Gulf of Fossur-Mer and in the delta margin provides local oceanographic and meteorological real-time data. The device is based on Doppler technology sensors fixed on the beacon pipe. Meteorological sensors, acquisition, and data transmission systems are clamped to the emerged structure close to Aide to Navigation (AtoN) and their energy systems. The monitoring of this device and analysis of recorded observations for nearly 4 years allows specifying uncertainties linked to this kind of measurement and provides a reliable feedback on the exploitation of the observatory. A database of simultaneous measurements of beacons structure behavior (tilting measurement) and oceanographic and meteorological parameters has been used to design new BFIs for future projects (Lavezzi in Bonifacio Strait, Corsica, Port of Marseilles Authority, etc.). Analysis of the current measurement enables one to characterize the current profiles on the water column located above sensors, and to distinguish flow stratification effects and wind-current correlations. Although originally designed to monitor the structure behavior and to supply wave climate to marine pilots, the system has developed different time applications. For example, sediment dredge bottom discharge has

P. Gaufrès (*) and B. Andres Centre d'Etudes Techniques Maritimes et Fluviales (CETMEF), Boulevard du Président Kennedy, 13097, Aix-en-Provence cedex 02, France e-mail: [email protected] F. Dufois Institut de Radioprotection et de Sûreté Nucléaire (IRSN) DEI/SESURE/LERCM – Base IFREMER CT, 330 83507 La Seyne-sur-Mer, cedex, France

been optimized in the Gulf of Fos and frequency ­analysis of sea level has been compared to coastal tide gauge data for the historical Rhône flood in December 2003.

1  Introduction The origin of the instrumentation of two BFIs in the Gulf of Fos came from different needs from two partners. On the one hand, the CETMEF (French Institute for Maritime and Inland Waterways) wanted to improve in situ knowledge of BFI’s structural behavior. However, Port Authority of Marseilles, owner of a wavemeter (Datawell type) in the Gulf of Fos, often stormed by ships, wanted to secure this. In 2001, the Port Authority of Marseilles, CETMEF, and Maritime Service of Bouches-du-Rhône (SM13) agreed to build a metocean observatory on two BFIs (Fig. 1) located in the Golf of Fos (France).

2  Instrumentation Description The current profiler is an Awac type from Nortek. It uses Doppler technology, based on a phase difference calculation between the emitted and received frequencies. Phase difference is linked to particle speed in the water (plankton, sediments, etc.). Those particles are driven by the current and permit its measurement. The instrument also measures sea level (pressure sensors), sea temperature, and eventually wave parameters. The Awac is clamped on supporting arms perpendicular to the beacon’s main pipe (Fig. 2). The arms were calculated so as to install ADCP 3.5 m away from the main pipe so that Awac beams

H.-J. Ceccaldi et al. (eds.), Global Change: Mankind-Marine Environment Interactions, Proceedings of the 13th French–Japanese Oceanography Symposium, DOI 10.1007/978-90-481-8630-3_43, © Springer Science+Business Media B.V. 2011

251

P. Gaufrès et al.

252

are not disturbed by BFI structures. Depths are 15.5 m for the Fos no. 2 ADCP and 14.5 m for the Balancelle one along the Rhône deltaic margin. The ultrasonic anemometer is a Vaisala WS425 type. It was fixed on a metal bar on the BFI nacelle, 7.0 m above average sea level.

3  Operational Use and Research For the Marseilles Port Authority navigation needs, data are displayed on control screens of the Integrated Regulation Center (CRI) located in Port-de-Bouc and can be communicated to approaching ships. Data are treated by CETMEF for applied research: structural behavior, marine hydraulics, statistic analysis, metocean parameters, treatment, etc. Correlations were produced among wave height, wave direction, wind intensity, wave height, wind direction, and current direction. The surface current and wind are well correlated, especially the mistral and SW storm winds (135° and 315°) (see Fig. 3); shear current on the subsurface may be observed during some episodes (Fig. 4). Fig. 1  BFI in its environment (left) and structure (right)

4  Conclusions

Fig. 2  ADCP on the perpendicular arm during an inspection

Years of real-time data experience provided by profiler technology fixed on BFIs shows the interest in coupling marine observations to AtoN buoys: direct energy supply (solar or wind), localization, safety of equipment, etc. However, we advise keeping the instrument in its original configuration, including magnetic North, independently positioned on sea bottom on a tripod and connected to a buoy by a short umbilical wire to avoid trawling. Many prospects are foreseen with spatial altimetry or coastal oceanic modeling for integrating those observations as boundary conditions. Current projects with actual and future MESURHO instrumentation are projected in order to study flow structure in the Rhône river mouth, hydrosedimentary

Oceanographic Real-Time Measurement on Buoyancy Beacon Feedback in the Rhône Delta and Gulf of Fos Fruce France

253

Wind (10 to 20 knt) 360 315

Current direction

270 225 180

Level 11 Level 12

135 90 45 225

270

315

360

45

90

135

180

Wind direction

source : PAM / CETMEF

225 traitement : CETMEF-GAEM

Fig. 3  Wind/current directions correlation (idem) 14 13 12 Days

11

1 2 3 4 5 6 7 8 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

10 9

Level

8 7 6 5 4 3 2 1 0 0,00

0,05

0,10

0,15

0,20

0,25

0,30

0,35

0,40

0,45

0,50

Daily average current speed (m/s)

Fig. 4  Daily average current profile (idem)

processes off the coast of the Gracieuse They, or North Occidental Mediterranean Sea meso-scale dynamics of vortexes identified in the 3D Symphonie model.

Acknowledgments  G. Cunty, H. Barreda (CETMEF), C. Roblin (SM13), B. Vion (CETE Méditerranée), J. Moisan, and F. Denivet (Port Authority of Marseilles).

Oceanographic Real-Time Measurement on Buoyancy Beacon ...

Sep 25, 2010 - Cite this paper as: Gaufrès P., Andres B., Dufois F. (2010) Oceanographic Real-Time Measurement on Buoyancy Beacon Feedback in the ...

2MB Sizes 2 Downloads 217 Views

Recommend Documents

Buoyancy - Flow Visualization
Feb 9, 2011 - water, 1000 kg/m3, and carbon dioxide gas,1.95 kg/m3 at standard temperature and pressures[1][3]. The Photo was taken looking from the bottom of the class upward and taken once the water temperature fell below 9⁰C since no condensatio

Mast Buoyancy - Testing and Sealing.pdf
side, that's good. And if, when ... Note: A fully inverted capsize is always the best leak test, as this puts the mast. head under ... an opportunity to practice capsize recovery. Any water ... knowledge I would appreciate an email - here. I will the

The Beacon Cover Competition 2016 - Beacon Hill School
Everything else is up to you. Will you choose a theme? Will you choose a way of showing what Beacon Hill represents to you? Remember to make it colourful and eye-catching to be able to encourage people to want to read more! Your entry needs to be ret

Testimony Hearing on HR 735 and Project ... - Beacon Hill Institute
Jun 3, 2011 - The Subcommittee on Technology, Information Policy, Intergovernmental Relations and ... might stand to benefit from the passage of H.R. 735. .... negotiated outside its purview by vendors who might want to do business.

Florida Atlantic University, Harbor Branch Oceanographic Institute ...
DVM/MS). Ft. Pierce, FL ... Harbor Branch and FAU colleges and campuses. ... A Doctor of Veterinary Medicine (DVM or equivalent) from an AVMA accredited.

the Beacon
Internet, this book will give you the motivation to find the tools to educate your kids and to set .... It seems to be the way of things that Home is never fully appreciated until it has been .... the summit of Cummings Hill (4 miles to go). Plunge d

The Beacon Cover Competition 2016 - Beacon Hill School
Everything else is up to you. Will you choose a theme? Will you choose a way of showing what Beacon Hill represents to you? Remember to make it colourful ...

Bahana Beacon -
The Bakrie Group may sell ANTV to raise cash .... Following the Constitutional Court decision to allow SOE banks to write off past bad debts, ...... ICB Bumiputera.

Florida Atlantic University, Harbor Branch Oceanographic Institute ...
biomedical and biotechnology research, ocean engineering and technology, and ... Resources' job website (https://jobs.fau.edu) by completing the Faculty, ...

On the Conceptual Foundations of Psychological Measurement
On the Conceptual Foundations of Psychological Measurement. Brian D. Haig. University of Canterbury. Denny Borsboom. University of Amsterdam.

Buoyancy Foil Boat Lab.pdf
How many coins did the winning boat carry? ______. 6. List 2 observations you determined about the shape of winning boat? a) b). 7. What could you do to make your boat stronger? 8. The boats all weighed the same, how did boat volume affect their succ

Welcome to Beacon Hill School
Admissions in an ESF school. Mainstream applications. ▫ Apply online via the ESF web site usually in the September of the year. BEFORE the child is due to ...

beacon hill school
Medication Authorization Form is available on our school website (see Policies). 6. Medication will not be ... medication bag/bottle. Signature of Parent/guardian.

Customizable Tracking Solutions - Beacon Technologies
A Web Marketing ... campaigns, not just based on the final visit, which is where Google ... application Conversions), Several visits were often vital to creating.

Realtime HTML5 Multiplayer Games with Node.js - GitHub
○When writing your game no mental model shift ... Switching between different mental models be it java or python or a C++ .... Senior Applications Developer.

Learn to Write the Realtime Web - GitHub
multiplayer game demo to show offto the company again in another tech talk. ... the native web server I showed, but comes with a lot of powerful features .... bar(10); bar has access to x local argument variable, tmp locally declared variable ..... T

ADOW-realtime-reading-2017.pdf
September-November 2017 TheTenthKnot.net. SEPTEMBER. OCTOBER. Page 1 of 1. ADOW-realtime-reading-2017.pdf. ADOW-realtime-reading-2017.pdf.

Acronyms used within Beacon Academy.pdf
Acronyms used within Beacon Academy.pdf. Acronyms used within Beacon Academy.pdf. Open. Extract. Open with. Sign In. Main menu.

What's in the April Beacon? - CAP Members
I share the belief, along with most of the people involved in cadet programs, that our ... program, prominently displayed on one of the Cadet Programs web pages.

MUVISYNC: REALTIME MUSIC VIDEO ALIGNMENT ...
computers and portable devices to be played in their homes or on the go. .... lated cost matrix and the path through this matrix does not scale efficiently for large ...

Measurement - GitHub
Measurement. ○ We are now entering the wide field era. ○ Single gains no longer adequate. ○ Gains are direction dependant ...

Summer 2016 Beacon Final pdf.pdf
your office. Some of the attendees went to the. Mackinaw Valley Winery and learned what is. involved with growing grapes and making. wine. While others of us, ...