A flood forecasting model on river Oise with the plugin Mascaret - - PowerPoint PPT Presentation

Authors : Patrick Chassé Contributors : Cédric Chabridier, Delphine Duval, Murièle Etangsale et Charles Sourdiaux (Flood forecasting service Oise-Aisne)

Reach Origny-Sainte-Benoite to Sempigny

A flood forecasting model on river Oise with the plugin Mascaret

TUC 2019 – 15 to 16 October 2019

Sempigny station

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1)Objectives of the project 2) Project approach 3) Construction of the model on the river Oise 4) Calibration and exploitation of the model 5) Conclusion

Plan of the présentation

TUC 2019 – Cerfacs Toulouse

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• Check the feasibility of porting the existing model

under Mascaret

• Take the test on one of the seven sections of the

existing model: choice of the reach on the river Oise between Origny-Sainte-Benoite and Sempigny

• Implement the Mascaret plugin for Qgis

Reminder of objectives

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• From the existing model, including the position of

cross sections

• Integrate the bathymetry of the profiles data
• Use the existing DEM (step 1m)
• Use the hydrological data of the HYDRO database

(Origny-Sainte-Benoite, Condren, Sempigny, Serre, Ailette and Verse)

• Calibrate the model on the 2011 flood, and verify it
• n the 1993 and 1995 floods

Project method

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• Traces of the media profiles in the form of MapInfo

tables (but the name of the profiles is not in attributes)

• Tracking profiles from images in pdf format (a bit

heavy work phase)

• Retrieval of the profile file in Mascaret format for

georeferencing from support profiles (fortran routines)

• Extract topo data from DEM on support profiles

Construction of the model on the river Oise

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Cross profile example

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The model consists of :

• 5 branches
• 3 free extremities
• 175 cross profiles
• 1 basin (link between two branches separated by

the lateral canal at Chatillon-sur-Oise)

• Two river-basin links

Construction of the model on the river Oise

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Hydraulic structure under the lateral canal

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Link under the lateral canal

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Hydrological data available in the HYDRO database :

• Limnigraphs and hydrographs at Origny-Sainte-

Benoite, Condren and Sempigny stations (2011, 1993, 1995, 2013 and 2016 floods)

• Hydrographs on the tributaries of the river Oise: the

Serre, Ailette and Verse (same floods)

• Calibration flood : 2011
• Validation floods : 1993, 1995, 2013 et 2016

Calibration of the model

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Calibration of the model : flood 2011

TUC 2019 – Cerfacs Toulouse

• Results of calibration : Kriver = 18 and Kfloodplain = 8
• Taking into account of diffuse inputs on the basis of the hydrograph of the river Serre

Mascaret Hydrarive

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Calibration of the model : flood 2011

TUC 2019 – Cerfacs Toulouse

Mascaret Hydrarive

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Calibration of the model : flood 2011

TUC 2019 – Cerfacs Toulouse

Mascaret Hydrarive

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Validation flood : 1993

TUC 2019 – Cerfacs Toulouse

Mascaret Hydrarive

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Validation flood : 1993

TUC 2019 – Cerfacs Toulouse

Mascaret Hydrarive

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• The results of the calibration of the model with

Mascaret are rather satisfactory (comparable in quality to the Hydra model)

• The porting objectives of the model under Mascaret

have been achieved

• An
• ccasion

to test and improve the plugin Mascaret thanks to Artélia

Conclusion

Journées GASP Nancy 2019

Patrick Chassé Hydraulic modeling project manager +33 (0)3 44 92 60 62 patrick.chasse@cerema.fr

Thank you for your attention