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
Transcript of Overview of the Sea Level research activities in France ... · The tidal model •t-UGOm (Toulouse...
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
My Background L. Testut LEGOS/NIO
http://www.legos.obs-mip.fr/observations/rosame
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
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
Gulf of Khambhat
350 Km
M2 > 3m.
J1N Harmonics Constituents
FES2004
NOISE
SIGNAL
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)
M2
M2 M4
Validation at the coast
MODEL OBSERVATION
amplitude
phase southward northward
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
FES2004
t-UGOm
NOISE
SIGNAL
It’s really better …. but not good enough !!
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
www.sonel.org
Message
• Importance of the installation of GPS@Tide Gauge
• This is a new requirement of the GLOSS implementation Plan
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).
