overview of the sea level research activities in france ... · the tidal model •t-ugom (toulouse...
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Overview of the Sea Level research activities in France Indo-French collaboration : current status and perspective
L. Testut(1)(2), A. S. Unnikrishnan(2), M. Lengaigne(3)(2), A. G. Nidheesh(2), A.K. Shukla(2), Babu(2), I. Suresh(2), … (1) LEGOS, Toulouse, France (2) NIO, Goa, India (3) LOCEAN, Paris (4) ISRO, Ahmedaba, India
Tide Gauges
Satellite Altimetry
Tide Modeling
Long Term Seal Level Change
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My Background L. Testut LEGOS/NIO
http://www.legos.obs-mip.fr/observations/rosame
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Objectives
• Observation • Modeling
• Show some examples of the existing collaboration between India and France relative to sea level studies
• Visit INCOIS, meet people and share experiences and skills and why not start new collaboration on sea level
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Tidal Modeling on the west coast of India
Testut L.(1)(2), Unnikrishnan A.S.(1)
(1) NIO, Goa (2) LEGOS, Toulouse
1stJOINT ISRO/CNES CAL/VAL EXPERIMENT
SAC/NIO/LEGOS/CNRS
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Gulf of Khambhat
350 Km
M2 > 3m.
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J1N Harmonics Constituents
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FES2004
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NOISE
SIGNAL
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The tidal model
• t-UGOm (Toulouse Unstructured Grid Ocean model 2D, ex-Mog2D) – 2D barotropic model
– Using finite element for the spatial discretization of the mesh
– Based on the non-linear shallow water equations (Lynch and Gray, 1979)
– Without assimilation
– We have run the model for the principal tidal waves (M2,K1,O1,P1,S2,….)
• Forced at the boundaries with Altimetry with (CTOH harmonical products)
• Used the ETOPO2 modified bathymetry (Sindhu et al., 2007)
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M2
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M2 M4
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Validation at the coast
MODEL OBSERVATION
amplitude
phase southward northward
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MODEL RSS(cm)
t-UGOm 3.7
GOT4.7 3.7
FES2012-HYDRO 4.8
FES2004 5.5
MODEL RSS(cm)
t-UGOm 22.3
GOT4.7 29.7
FES2012-HYDRO 29.7
FES2004 70.3
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FES2004
t-UGOm
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NOISE
SIGNAL
It’s really better …. but not good enough !!
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Modeling perspective Arabian Sea Bay of Bengal
Mouth of the Ganges
ADCIRC / TUGO / SELFE / TELEMAC ?
Band-Aid : Belmont Forum project 2 years Contract starting this year
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www.sonel.org
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Message
• Importance of the installation of GPS@Tide Gauge
• This is a new requirement of the GLOSS implementation Plan
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Conclusion
• India and France both had a long and rich experience on sea level observation.
• Since last year we also share the success of the launch of an innovative satellite altimetric mission (SARAL/AltiKa)
• INCOIS is a focal point regarding the sea level studies : observation and modeling (tsunami).