Système d'Observation du Niveau des Eaux Littorales (SONEL)

Last data events on SONEL

eprout01 — 2020-03-31T08:32:53Z

On its website, SONEL highlights the last data events (see "Last data events" tab) that occured for a few weeks:
– Last downloads of data out of the automatic process - large amount of data (for the last 25 days).
– Last GNSS stations added on SONEL (for the last 2 months).
– Last sitelog updates on SONEL (for the last 4 weeks).

Don't hesitate to contact us if you have questions
sonel@sonel.org

Contact:

Elizabeth Prouteau, Network Coordinator, IT Engineer
elizabeth.prouteau@univ-lr.fr

Briefly:

– Sitelog are updated weekly on wednesday.
– Data collect latency usually occures when a new GNSS station is added in our database or when data are made available with latency: manual collect because there is no network on the site, delay because of private interest on the data, new availablilty of an automatic process,...

See more information about SONEL's data collect process.

New GNSS@TG contribution from Estonia (12 stations from MAA-MET)

eprout01 — 2019-04-24T12:29:36Z

ESTPOS network

The Estonian Land Board (MAA-AMET Service) operates the ESTPOS network, which currently consists of 29 permanent GNSS stations homogeneously distributed across the country (click on the right map to enlarge, and see their location, in green). Four of these stations contribute to the EUREF permanent GNSS network, namely:

- Kuressaare (KURE)
- Suurupi (SUR4),
- Toila (TOIL),
- and Toravere (TOR2). Click on the 4 character GNSS identifier to access the EUREF webpage of a particular station, and see its details (pictures, local map, etc.).

Out of the 29 GNSS stations, 12 are co-located at (or nearby) tide gauges. By making their observations available to SONEL, the Estonian Land Board contributes to the scientific objectives of the global sea level observing programme (GLOSS) and to the IGS Working Group (TIGA) on GNSS tide gauge benchmark monitoring. These data contribute to assess the vertical stability of the land upon which the tide gauges are grounded. As SONEL users know, this information on vertical land motion is key to understanding sea level change and variability as observed by tide gauges, in particular to separate contributions from climate change (e.g., land ice melting, thermal expansion) and from solid Earth (e.g., subsidence due to groundwater extraction, sediment compaction, or post-glacial rebound).

KAUR Tide Gauge Network

MSI Tide Gauge Network

The 12 permanent GNSS stations are co-located with tide gauges from two networks / agencies, namely from the Estonian Environmental Agency (KAUR) and from the Maritime Institute (MSI) at Tallinn University of Technology. Click on the right thumbnail maps to enlarge, and get an overview of the location of the tide gauges within each network.

End of 2018, SONEL has contacted the Estonian Land Board (MAA-AMET Service), regarding the data availability of the 12 permanent GNSS stations installed near a tide gauge. And since January 2019, the daily observation in RINEX format are available on SONEL. The timeline below shows the record length for each station, and data availability for each of the 12 GNSS stations.

GNSS record length for each station

GPS NAME	ACRONYM	LATITUDE	LONGITUDE	TIDE GAUGE	DISTANCE TIDE GAUGE-GNSS	INSTALLATION DATE	LENGTH
AUDRU	AUDR	58.38472222	24.48083333	PARNU	10616 m	2007-11-13	10 years
EMMASTE	EMM1	58.69073889	22.55356111	SORU	1831 m	2017-12-06	1 years
EMMASTE	EMMA	58.69073889	22.55356111	SORU	1830 m	2014-09-01	3 years
HANILA	HANI	58.62354722	23.63280833	VIRTSU	8918 m	2014-09-05	4 years
KARDLA	KARD	58.99437222	22.71956111	LEHTMA	8442 m	2008-08-06	10 years
KURESSAARE	KURE	58.21385833	22.50571389	ROOMASSAARE	4657 m	2007-11-15	11 years
MUSTJALA	MUJA	58.46315666	22.23255631	SAAREMAA HARBOUR	7843 m	2015-09-04	4 years
MUSTAMAE2	MUS2	59.42052778	24.69747222	TALLINN	5397 m	2012-04-25	7 years
TALLINN	MUST	59.42052778	24.69747222	TALLINN	5464 m	2009-01-01	3 years
NARVA-JOESUU	NJOE	59.46070000	28.04130556	NARVA-JOESUU	366 m	2015-06-18	4 years
PURKSI	PYRK	59.00657222	23.52128056	HAAPSALU	7181 m	2014-08-25	4.5 years
RUHNU	RUHN	57.78230833	23.26879167	RUHNU	598 m	2014-10-18	4.5 years
SUURUPI	SUR4	59.42052778	24.69747222	TALLINN	22418 m	2011-09-21	7.5 years
SUURUPI	SUUR	59.42052778	24.69747222	TALLINN	22417 m	1996-11-29	5 years
VERGI	VERG	59.60148333	26.10078611	EISMA	12013 m	2015-07-03	4 years

Copernicus Special Issue on “Developments in the Science and History of Tides”

Guy Woppelmann — 2018-11-13T16:24:33Z

Annoucement

This is to mention once again the special issue of Copernicus journals called “Developments in the Science and History of Tides”. The issue is open to any aspect of the subject including the present accuracy of coastal, regional and global tide models, tidal dissipation and its role in geophysics, internal tides and their role in mixing the ocean and in the global ocean circulation, secular changes in tides, and new techniques for measuring tides and analysing the data. Click on the thumbnail to learn more about this announcement.

In order to accommodate such a wide range of topics, the special issue spans five Copernicus journals:

- Ocean Science – for aspects of tides in the ocean
- Nonlinear Processes in Geophysics – for aspects of tidal dynamics including internal tides
- Solid Earth – for aspects of solid earth and planetary tides
- Atmospheric Chemistry and Physics – for aspects of atmospheric tides
- History of Geo- and Space Sciences – for any aspect of the history of tidal science or scientists

The special issue is intended to mark the 100th anniversary of the founding of the Liverpool Tidal Institute (LTI). The LTI was established in 1919 and for many years was the world centre for knowledge of the tides, with Joseph Proudman taking the lead in dynamical theories, and Arthur Doodson in the analysis of tidal information from around the world, and on tidal prediction. The year 2019 is also the 100th anniversary of the IUGG, which will celebrate this anniversary during its 27th General Assembly at Montreal (Canada).The IUGG Montreal Assembly will include a Joint Symposium on Tides with IAPSO as the lead Association.

Manuscript submission:
Authors can submit their contributions by using the online registration form on the websites of any of the above journals (until the end of 2019). During the registration process, it is important that the correct special issue is selected, which is “Developments in the science and history of tides (OS/ACP/HGSS/NPG/SE inter-journal SI)”.

Papers that are accepted for publication will appear immediately on the web site of the appropriate journal. Eventually a printed version of the whole special issue will become available.

2018 Dec 10-14: AGU Session G015 dedicated to GNSS at tide gauges

eprout01 — 2018-07-12T13:11:51Z

The next AGU fall meeting will take place on 2018 Dec 10-14, at Washington D.C. Part of this meeting, the session G015 is dedicated to the use of GNSS technology for coastal water level observations:

"Integration of GNSS into Water Level Observation Networks: Priorities, Technologies, and Benefits"
Tide and water level station records are some of the longest and most meticulously-kept earth observation records, but these data were historically only tied to local staffs or nearby bench marks on land. Integration of GNSS at these stations not only provides efficiencies in operational station maintenance cycles, but also adds value to these long-term water level records by connecting them to national and global reference frames and enabling the quantification of relative sea level trend components. Despite the recognized value of fusing these oceanographic and geodetic tools, only a subset of global water level stations fully leverage GNSS. This session invites the community to share new research that demonstrates the value of GNSS-linked or GNSS-enabled water level stations, exchange knowledge about best practices for instrumentation, and showcase innovative technologies or methodologies that will advance reliable, effective, and informed use of GNSS in water level observation networks.

Full session details and an abstract submission link are available here. The abstract submission deadline is on 1st August 2018 23:59 EDT.

Committee
Primary Convener:
Nicole Kinsman (NOAA National Geodetic Survey )
Co-conveners:
Adria Schneck (NOAA Center for Operational Oceanographic Products and Services)
Mike Craymer (Natural Resources Canada)
Mederic Gravelle (University of La Rochelle)

2–4 July 2018: Sea Level Futures Workshop, Liverpool (Abstract deadline 30 March)

eprout01 — 2018-03-13T14:53:39Z

Sea Level Futures Workshop, Liverpool 2–4 July 2018

Outline Plan for Sessions

This is a provisional list of sessions, some adjustment may be made nearer to the time. Every session will start with a keynote presentation followed by a series of oral and poster presentations. We welcome abstracts from all attendees.

1. Sea level observations: present and future

- Role of PSMSL in sea level research
- Present day tide gauge observing systems (GLOSS, EuroGOOS and GGOS)
- Present and future of space observations (e.g. coastal altimetry, mass changes in the ocean, changes in the cryosphere)
- Space geodesy for sea level

2. Modelling of regional sea level and its contributors

- Challenges in modelling of sea level
- Ocean heat content
- Progress in modelling of the contribution from the cryosphere
- Vertical land movement

3. Understanding of regional sea level rise and variability (multiple data synthesis, novel methods, synthesis of observations and models)

- Drivers of regional sea level rise and variability
- Novel methods and multiple data synthesis for sea level reconstructions (including paleo data)
- Use of advance techniques for attribution of regional sea level variability

4. Coastal sea level rise and variability

- Extreme sea levels in coastal area (observations and modelling)
- Sea level variability at the coast: the role of waves
- Advance in coastal sea level projections
- Impact of sea level rise in coastal areas

Abstract submissions

To submit an abstract please click here submissions will close 30 March 2018

Conference Registration

– Registration covers attending the main meeting including refreshments and lunch, icebreaker reception and conference dinner.
– To register please click here
– Early bird registration £100.00 per delegate opens 1 February 2018 and closes 20 March 2018
– Standard Registration will open 21 March and close 30 April 2018 priced at £120.00 per delegate.
– Delegates notified of acceptance of posters/talks after 20 April 2018

Further information and official workshop website

29th to 31st of May 2018 : National Conference "Génie Côtier - Génie Civil" - La Rochelle

eprout01 — 2018-01-15T10:47:32Z

– The XVth National Conference "Génie Côtier - Génie Civil", JNGCGC 2018, organised by the association: "Centre Français du Littoral", the University of La Rochelle and their partners, will take place in La Rochelle, from the 29th to the 31st of May 2018.

THEMAS :
— Coastal hydrodynamic
— Sediment dynamic
— Instrumentation, measures and teledetection
— Water and sediment transfer in harbours and marinas
— Marine energies and ressources
— Sustainable development of coastal and estuarine zones
— Coastal risks

Download the bulletin n°1

Instructions for a communication's submission :
— Abstracts should be sent before 2018-02-01
— Article's submission should be completed before 2018-03-01

For further information, please look at the specific site of this conference

A new permanent GNSS station at Dakar GLOSS tide gauge

eprout01 — 2017-11-22T14:39:46Z

GLOSS Core Network

Dakar (Senegal) hosts one of the longest sea level records available in Africa with a multidecadal time series available at the Permanent Service for Mean Sea Level (PSMSL). The current tide gauge is operated by the University of Hawaii Sea Level centre (UHSLC) under the framework of the Global Sea Level Observing System (GLOSS) established by the Intergovernmental Oceanographic Commission (IOC) of UNESCO in 1985. Click on the left icon to display a map showing the GLOSS core network of stations, and the Dakar location within this network.

GNSS station at Dakar tide gauge since Nov. 2017

This station is locally maintained by the Lighthouses and Beacons Sub-Division of the Port Authority of Dakar. Despite the presence of permanent GNSS stations located in Dakar, these stations are distant from the tide gauge, and may not represent the vertical land motion actually experienced by the tide gauge, which is located inside one of the largest harbours in West Africa (Le Cozannet et al., 2013). See for instance the DAKA GNSS station, which in addition is decommissioned since 2007 and has discontinuities in the series, which are harmful for estimating an accurate trend. Hence, a geodetic GNSS station dedicated to monitoring the vertical land motion at the very tide gauge was highly desirable following the guidelines of the last GLOSS programme implementation plan.

Top panoramic view of Dakar GNSS antenna

In early November 2017 a France-Senegalese team composed by SONEL partners and ANAT (Agence nationale de l'Aménagement du Territoire) installed a new permanent GNSS station at the very top of the GLOSS tide gauge. A precise levelling was performed to link the GNSS antenna to the tide gauge benchmarks. The Trimble Zephyr Geodetic antenna lies on top of a 3 meters galvanized steel mast anchored in the concrete wharf near the tide gauge hut (Click on the icons to enlarge) within a meter distance from the radar sensor at the Southern jetty of the Dakar commercial harbour.

This GNSS station is autonomous and powered by a solar panel. The measurements from the Trimble NetR9 GNSS receiver are transmitted as daily RINEX files with a sampling rate of 30s through the 4G local network. This new station is operated by the Senegalese “Direction des Travaux Géographiques et Cartographiques” (DTGC) and its data are public and freely available in accordance with the Oceanographic Data Exchange Policy of the Intergovernmental Oceanographic Commission of UNESCO at the SONEL website.

Project team for the GNSS@TG station

TEST

The picture on the right shows the actors of this installation (from left to right) : Oumar H. Ka (Director of DTGC/ANAT), Thomas Donal (Surveyor IGN), Abdoukarim Mbengue (IT DTGC/ANAT), Ibrahima Ndiaye (Chief Surveyor DTGC/ANAT), Dr. Issa Sakho (Assistant Professor University of Thiès), Madiabe Diouf (GIS responsible DTGC/ANAT), Etienne Poirier (Engineer LIENSs - Université de La Rochelle).

Useful References:
– Link to the SONEL webpage of this GNSS station (DATG), where further details and data can be found.
– Le Cozannet G., Raucoules D., Wöppelmann G., Garcin M., Da Sylva S., Meyssignac B., Gravelle M., Lavigne F. (2015). Vertical ground motion and historical sea-level records in Dakar (Senegal). Environnmental Research Letters, 10, doi:10.1088/1748-9326/10/8/084016.

Please tell us about your new updates at:
sonel@sonel.org

Contact :
sonel@sonel.org

IOC Manual on Sea Level Measurement and Interpretation (Vol. V): Radar Gauges

eprout01, Laurent Testut — 2017-03-13T15:42:54Z

The IOC/UNESCO just released the 5th volume of the Manual on sea level measurement and interpretation. This volume is devoted specifically to radar tide gauges. In the decade since Volume 4, they have been applied to measuring sea level at many locations. They have already replaced the previous tide gauge technologies in many countries. Their low cost (in most cases) and the fact that they are relatively easy to install and maintain mean that they have been the technology of choice whenever new sites have been instrumented or older ones refurbished.

– Part 1 of this Volume 5 discusses topics such as how radar gauges can be mounted over the water to measure sea level. It considers how gauges can be calibrated, either in the laboratory before installation or in the field during routine maintenance visits. It describes how radar performs in comparison to other technologies and discusses how the measured radar levels can be biased in the presence of waves and, consequently, what other technologies must be used in parallel.

– Part 2 of this Volume returns to some topics that have been presented in the previous Volumes 1-4 of the Manual. These are particularly important aspects of tide
gauge measurements, and so have been repeated each time, although in different ways. We suggest that new readers of the volumes would benefit from looking at Volumes 1-4 before reading the present Volume 5. Although the earlier volumes date from many years ago, and technology has evolved considerably in the meantime, much of the previous discussion is educational with regard to how the historical sea level data set has been obtained.

There are often dangers in exchanging one measuring system for another, in that different systematic methods can be introduced into a long-term time series, so an appreciation of how methods have changed is essential. It is clear that the same kind of mistakes in changing technologies could be occurring now, as radar systems replace others, so we must make attempts to understand them all as well as we can.

The online English version is available here.

A French version and a Spanish version are also available at the UNESCO documentation server.

27th August to 1st September 2017: Session at the Joint IAPSO-IAMAS-IAGA Assembly 2017 in Cape Town, South Africa

Guy Woppelmann — 2017-03-02T17:59:18Z

– Session P05 - Advances in Monitoring, Detecting, Understanding, Hazard Assessment and Forecasting of Mean and Extreme Coastal Sea Level.

The deadline for abstracts has been extended to 12th March, 2017.
See the web site at http://www.iapso-iamas-iaga2017.com/

Rapid growth of coastal populations and nearshore development have increased the need for sea level data to understand, monitor, detect, predict and forecast current, long term and extreme variability. Data from sea level monitoring stations have a wide range of applications including research, planning, hazard assessment and operational and warning systems.

The session seeks contributions on developments in technology and operations as well as the status of sea level stations and networks. It also welcomes presentations on advances in scientific research and studies on understanding the dynamics of sea level change, as well as extreme sea level events. The session will also discuss the use of sea level data for coastal operations, hazard studies and warning systems. Advances in sea level data use for the detection and forecasting of tsunamis, storm surges, climate change and other sea level extremes are welcome, as well as contributions on techniques of sea level data analysis and data archival.

– Conveners

— Christa G. von Hillebrandt-Andrade, NOAA Caribbean Tsunami Warning Program, Lead Convener, christa.vonh@noaa.gov
— Phil Woodworth, NOC UK, plw@noc.ac.uk
— Vasily Titov, NOAA, PMEL, vasily.titov@noaa.gov
— Alexander Rabinovich , Inst. Oceanology, Russia and Inst. Ocean Sciences, Canada, a.b.rabinovich@gmail.com

New GNSS stations 2016

eprout01 — 2017-01-20T10:39:26Z

At the end of 2016, SONEL database number of GNSS@TG stations exceeded 900 permanent stations (914).

In 2016, six new stations were installed and integrated in the SONEL system:
– BGBC (Bourg Blanc), installed 2016-06-07,
– FRRL (FERROL - Puerto Exterior), installed in 2016-04-08 - New on this site near the tide gauge,
– WQSL (GPS Wake TG), installed in 2016-04-04 - New on this site less than 100m from the tide gauge,
– OWMG (Chatham Island - Owenga), installed in 2016-03-01,
– STMT (Saint Martin), installed in 2016-02-18, less than 100m from the tide gauge,
– APS1 (SANTANA - DOCAS), installed 2016-01-26, less than 1km from the tide gauge.

In 2016, ten GNSS stations installed in 2015 were also added to SONEL:
– BCL1 (Barcelona), installed in 2015-12-02,
– CANN (Cannes), installed in 2015-11-30, decommissionned since 2016-12-12, should be replaced soon,
– XIXO (Gijon), installed in 2015-11-12 - New on this site near the tide gauge,
– MRTG (Maré), installed in 2015-11-05 - New on this site less than 100m from the tide gauge; it was tied (levelling) to the tide gauge,
– SAS2 (Sassnitz), installed in 2015-10-22 - less than 100 m from tide gauge,
– MQSI (MIDWAY TG), installed in 2015-10-15 - New on this site less than 100m from the tide gauge,
– ASCG (ASCENSION), installed 2015-07-24, was tied (levelling) to the tide gauge,
– TGDR (BarahoTG_DOM2015), installed in 2015-07-08,
– UCA1 (Puerto Real - Cadiz), installed in 2015-06-01,
– SEY2 (Seychelles), installed in 2015-02-19, it was tied (levelling) to the tide gauge.