Combined use of physically based hydrological model and empirical models to improve parameterisation of erosion processes in a flash flood prone catchment

Author:

Hosseinzadeh Atiyeh1,Roux Hélène1ORCID,Cassan Ludovic12,Douinot Audrey13

Affiliation:

1. Institut de Mécanique des Fluides de Toulouse (IMFT) Université de Toulouse, CNRS Toulouse France

2. CECI, CERFACS/UMR5318 CNRS Toulouse France

3. Écorce, Ingénierie & Consultance Liège Belgium

Abstract

AbstractThis study assesses the effectiveness of a distributed physically based hydrological model (MARINE) to investigate erosion estimation during flash floods compared with other widely used empirical models derived from the Universal Soil Loss Equation (USLE) like Revised Universal Soil Loss Equation (RUSLE) and Modified Universal Soil Loss Equation (MUSLE). It is carried out on a small catchment in south‐eastern France, the Claduègne catchment. To compare the erosion volumes simulated by the three models, MARINE, MUSLE and RUSLE, a sensitivity analysis on the model parameters is carried out. According to physics‐based simulations, flood events fall into two categories: those dominated by raindrop erosion and those dominated by shear stress erosion. The results show that the erosion simulated by the three methods are comparable, except for events dominated by raindrop erosion suggesting that further research is needed to improve raindrop erosion within MARINE. Simulations from the MARINE model provide access to the spatio‐temporal variability of erosion dynamics during the event and can also be used to produce erosion/deposition maps, which are useful for environmental decision‐makers and planners in identifying areas at risk from erosion and deposition hazards.

Funder

Office Français de la Biodiversité

Région Occitanie Pyrénées-Méditerranée

Publisher

Wiley

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