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Text Content

Home Presentation
 * Aims and rationale
 * Origin of SONEL
 * Scientific & technical partners

Observations
 * Tide gauges
 * GNSS
 * Stability of the datums
 * Doris
 * Absolute gravimetry
 * Station management

Products (demonstrative)
 * Sea level trends
 * Vertical land movements
 * Horizontal land movements
 * Waves

Web Services Programmes (GLOSS)
 * Global Sea Level Observing System (GLOSS)
 * PSMSL
 * TIGA

CGPS@TG Users
 * Applications
 * Publications
 * Statistics

Documentation Partners & Contacts
 * GNSS Data Providers
 * SONEL contacts

Station manager only

or ULR authentication





NEWS

2023 Dec 11-15 : AGU Session dedicated to GNSS for water level (29 juin 2023)

12-14 January 2021 : First EuroSea tide gauge network workshop (28 octobre 2020)

Now published : IOC Manual & Guide 83 on Quality Control of in situ Sea Level
Observations (2 juin 2020)
↓ See previous news ↓


WELCOME TO SONEL

SONEL aims at providing high-quality continuous measurements of sea- and land
levels at the coast from tide gauges (relative sea levels) and from modern
geodetic techniques (vertical land motion and absolute sea levels) for studies
on long-term sea level trends, but also the calibration of satellite altimeters,
for instance.

SONEL serves as the GNSS data assembly centre for the Global Sea Level Observing
System (GLOSS), which is developed under the auspices of the IOC/Unesco. It
works closely with the PSMSL and the University of Hawaii Sea Level Center
(UHSLC) by developing an integrated global observing system, which is linking
both the tide gauge and the GNSS databases for a comprehensive service to the
scientific community. It also acts as the interface with the scientific
community for the French tide gauge data.




OBSERVATIONS

Tide gauges
Tide gauges
GNSS
GNSS
Doris
Doris
Leveling
Leveling


SEA AND LAND LEVELS AT THE COAST




OTHER PRODUCTS




NEW STATION CGPS@TG


Survey form

Help us to have the most complete and updated database




ADDITIONAL INFORMATION ON TIDE GAUGES

Coastal tide gauges have provided data on the sea level sometimes for almost two
centuries. They were originally deployed for the purposes of navigation and the
prediction of tides, but their field of application has been extended
considerably from coastal engineering and development to the precise knowledge
of variations in sea level related to extreme weather events (e.g. storms,
tsunamis) and to climate change, of which sea level is an essential parameter.
R. Chazallon (1802-1872), a French hydrographic Engineer, was the first to
introduce them in France in 1843. Tide gauge is not really an apropriate term
since a tide gauge does not actually mesure the tide but rather the sea level,
the tide being only one of the phenomena which result in sea level variations.
Today, tides are well enough understood and the observations of sufficient
quality to allow scientists to focus on other phenomena which result in
fluctuations of sea level (see applications tab).



While satellite radar altimetry has been revolutioning our understanding of the
oceans, there has been an unprecedented increase in the use of tide gauges over
the last twenty years, both in terms of the technology and the applications. The
increased need for coastal observations of sea level in digital form and easily
accessible using modern means of communication, goes beyond the traditional
boundaries of hydrography, tide prediction and navigation.

Hauteurs d’eau à La Rochelle (Février 2010)

Of course tide gauges are still widely used today for the purposes of navigation
close to the coast, but the data they provide are increasingly used in numerous
other applications which are employed to study the environment and the physical
mechanisms which govern it, together with coastal development. The figure to the
right illustrates the variety of signals contained in tide gauge recordings. By
subtracting our knowledge of the tide (prediction by the model) from the
observation, we obtain a "residual" (observation minus prediction) whose
scientific and practical value may be considerable in areas other than
navigation or hydrography.

– Some additional tide gauge applications.
– Concepts and definitions related to tide gauges.

The rescue and digitisation of historical tide gauge data constitutes a further
important source of sea level data, particularly since France has a wealth of
stations and data (See the online inventory by SHOM or Appendix A of the PhD
thesis of N.Pouvreau) which is testimony to a past that cannot be revisited (to
perform measurements) but which is interesting to study in order to understand
the changes in sea level that occur today. (Follow this link to find out more
about French tide gauge heritage and a useful digitisation tool: NUNIEAU). Here
are a few examples of ongoing or previous work, illustrated by posters :

Brest (3Mo)
Marseille (220Ko)
Dakar (3,6Mo)
Charente-Maritime (2,8Mo)

Introduction
Applications
Historical heritage




 


Service availability

FTPLe serveur FTP fonctionne correctement, ce service permet le téléchargement
et dépôt de fichiers RINEX. GPS Sol.Le service de téléchargement des solutions
de position GPS et de l'affichage des graphiques fonctionne correctement. QCLe
service contrôle qualité des fichiers RINEX fonctionne correctement. Les
graphiques de contrôle de la qualité des fichiers RINEX sont disponibles sur les
pages des stations GPS CGPS@TG Leveling Nb. RINEXNombre total de fichiers
RINEX/jour disponibles sur le serveur SONEL

7415143

Mentions légales | Data policy | SONEL contacts