Work Package 1
MUFFINS
Methodology
Work Package 1

Work Package 1: Coupling models and scales to reach users needs

This WP will be devoted to develop advanced forecasting methods coupling different models and scales. Such methods should be adapted to each end-user ’domain’, considering all damages caused by, not just river overflow, but also excessive rainfall runoff, especially in urban areas. Conversely, there is also a need for forecasting fluvial floods with larger lead-time for managing large and complex hydro-systems. That is why "seamless" modeling approaches enabling relevant information transfer between scales and/or models will be developed.

Task 1.1: High resolution precipitation products across scales: development of new merged products

This task aims at :

  • Evaluating from an ’hydrological point of view’ the actual precipitation products (QPE and QPF) used by flood forecasting centers to issue flood predictions.
  • Developing new approaches by merging already existing products.

Partners involved: INRAE, Univ. Eiffel, Meteo Fr.

Task 1.2: Regionalization and runoff production, fine scale disagregations

This task includes the adaptation and improvement of distributed hydrological models, at multiple scales, as well as crucial hydrological components (rainfall, infiltration) in fine 2D hydraulic modeling in order to overcome the issues related to hydrological forecasts in small ungauged catchments [38]. Efforts on improving multi-scale state-flux representation, and especially local runoff and stream discharge modeling, will be made using hypothesis testing and synergies with physiographic databases and hydrological signatures. This task will serve as a basis for proposing models of adequate complexity and enabling synergies with new data addressed in WP2 and experimentation on project study zones adapted to user defined scenarios/scales in WP3. The main questions addressed here will be:

  • How to combine parsimonious multi-scale hydrological models structures and constrain regional estimates of parameters and distributed runoff-discharge?
  • How to improve rainfall-runoff representation in 2D shallow water hydraulic models for fine characterization of hydraulic hazard?

This topic will include the adaptation, calibration and analysis of spatially distributed hydrological components in 2D SW models. A benchmarking of the proposed runoff modeling approaches will be performed on selected cases including fine scale local runoff issues both on small upstream basins and downstream floodplains. This includes a densely instrumented (rainfall, discharge, flow images, moisture) experimental sub-catchment of the Gapeau study watershed: the Réal Collobrier followed by INRAE for decades [32].

Partners involved: Cerema, IMFT, IMT, INRAE, INRIA Lemon.

Task 1.3: High resolution hydrological-hydraulic modeling of large domains

This task aims to develop high resolution integrated modeling approaches enabling to provide accurate information at fine scale over large basins. It will include the design implementation and test of coupled hydrological-hydraulic approaches for accurate modeling in space and time of multi-scale flash-flood processes, from local runoff generation to river network and floodplains hydrodynamics. Couplings will be performed between distributed hydrological models SMASH (INRAE) and MARINE (IMFT) with hydraulic models Floodos (Univ. Eiffel) and also DassFlow (IMT-INRAE) and TELEMAC (Cerema) including rainfall-infiltration components studied in Task 1.2. The main issues addressed here, using the study cases and rich datasets from WP3, are the following:

  • How to integrate high resolution spatial data in catchment-floodplain models?

 

  • How to couple hydrological and hydraulic models to improve the accuracy of flood simulations and information feedback?

Partners involved: Cerema, IMFT, IMT, INRAE, INRIA Lemon, Univ. Eiffel.

See also

Modification date: 15 June 2023 | Publication date: 26 April 2023 | By: Pierre-André Garambois