DASSFLOW

Examples of applications

Identification of inflow discharges. Pearl River, China.

• Identification of inflow discharge (at 3 boundaries)
• Observations :
  • water elevation at 3 gauging stations
  • discharge at 1 gauging station

Reference :

• Variational data assimilation for 2D fluvial hydraulics simulation. M. Honnorat, X. Lai, J. Monnier, FX Le Dimet.
  Invited talk at CMWR XVI-Computational Methods for Water Ressources. Copenhagen, june 2006.

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Assimilation of one satellite image. Flood plain, Moselle River, France.

• Observations :
  • Partial discharge measurements from the EDF station
  • One satellite image : partial elevation values

Observations from the EDF station : discharge values	Reliable elevation values extracted from the satellite image Work done by R. Hostache and C. Puech

• Sensitivities and identification of Manning coefficients

Manning coefficients: 10 land-uses

An video of a direct simulation on the Moselle River is available.

References :

• "Assimilation of spatial distributed water levels into a shallow-water flood model. Part II: using a remote sensing image of Mosel river". R. Hostache, X. Lai, J. Monnier, C. Puech.
  J. Hydrology Vol. 390, Issues 3-4, pp 257-268 (2010).
• "Assimilation of spatial distributed water levels into a shallow-water flood model. Part I: mathematical method and test case". X. Lai, J. Monnier.
  J. Hydrology. Vol. 377, Issue 1-2, pp. 1-11 (2009).

• Estimation de niveaux d'eau en plaine inondée à partir d'images satellites RADAR et de données topographiques fines
  Hostache R. & Puech C. 2007, revue Télédétection.

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Lagrangian data

Identification of the topography. Toy test case.

Configuration :

• Flow over a bump in a canal
• First guess : constant topography slope

Observations :

• Particle trajectories at surface
• Elevation at x=15m and x=70m

Topography and reference flow	Reference and identified topography

References :

• "Lagrangian data assimilation for river hydraulics simulations". M. Honnorat, J. Monnier, FX Le Dimet (U. Grenoble).
  Comput. Visu. Sc. (CVS). Vol. 12, Issue 5, pp. 235 (2009).
• "Lagrangian data assimilation for river hydraulics simulation". M. Honnorat's Phd thesis (in french), Grenoble Inst. Tech., 2007.

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Identification of the topography in a canal using a video camera.

• Video from an experiment conducted at the LMFA laboratory (N. Rivière, LMFA Lyon) :
  • flow over a plank in a canal
  • floating particles (confetti) are introduced

• Particle trajectories are extracted from the video (E. Huot, INRIA Clime Project)
• Identification of an "equivalent" topography (i.e. real topography + recirculation); identification of an "equivalent" Manning coefficient.

Experiment configuration	Image shot from the video: tracers at surface

References :

• "Identification of equivalent topography in an open channel flow using Lagrangian data assimilation." M. Honnorat, J. Monnier, N. Riviere, E. Huot, FX Le Dimet.
  Comput. Visu. Sc. (CVS). Vol. 13, Issue 3 (2010), pp. 111.
• "Lagrangian data assimilation for river hydraulics simulation". M. Honnorat's Phd thesis (in french), Grenoble Inst. Tech., 2007.

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Joint Assimilation Coupling algorithm: 2D zoom model over 1D global model

1D main channel coupled with 2D plain area

JAC Algorithm performs calibration (data assimilation) and coupling simultaneously.

References:

• "On a 2D zoom for 1D shallow-water model: coupling and data assimilation". I. Gejadze, J. Monnier.
  Comp. Meth. Appl. Mech. Eng. (CMAME) Vol. 196, issues 45-48, pp 4628-4643 (2007).
• "Superposition of local zoom model and simultaneous calibration for 1D-2D shallow-water flows".. J. Marin, J. Monnier.
  Math. Comput. Simul. 80 (2009), pp. 547-560.
• "Coupling superposed 1D and 2D shallow-water models: source terms and finite volume schemes".. E. Fernandez-Nieto, J. Marin, J. Monnier.
  Comput. Fluid. Vol.39, Issue 6, pp 1070-1082. (2010).

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