Generation of realistic synthetic catchments to explore fine continental surface processes

Raphaël Bunel, Nicolas Lecoq, Yoann Copard, Eric Guérin, Marco Van de Wiel, Nicolas Massei

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    Abstract

    Understanding, analysing, and predicting the erosion mechanisms and sedimentary flows produced by catchments plays a key role in environmental conservation and restoration management and policies. Numerical case-testing studies are generally undertaken to analyse the sensitivity of flood and soil erosion processes to the physical characteristics of catchments. Most analyses are conducted on simple virtual catchments with physical characteristics that, unlike real catchments, are perfectly controlled. Virtual catchments generally correspond to V-shaped valley catchments. However, although these catchments are suitable for methodical analysis of the results, they do not provide a realistic representation of the spatial structures of the landscape and field conditions. They can, therefore, lead to potential modelling errors and can make it difficult to extend or generalize their results. Our proposed method bridges the gap between real and traditional virtual catchments by creating realistic virtual catchments with perfectly controllable physical characteristics. Our approach represents a real alternative to traditional test case procedures and provides a new framework for geomorphological and hydrological communities. It combines a field procedural generation approach, geographic information system processing procedures, and the CAESAR-Lisflood landscape evolution model. We illustrate how each of these components acts in the process of generating virtual catchments. Five physical parameters were adjusted and tested for each virtual catchment: drainage density, hypsometric integral, mean slope of the main channel, granulometry, and land use. One of our virtual catchments is compared with a real catchment and a virtual catchment produced by a standard method. This comparison indicates that our approach can produce more realistic virtual catchments than those produced by more traditional methods, while a high degree of controllability is maintained. This new method of generating virtual catchments therefore offers significant research potential to identify the impacts of the physical characteristics of catchments on hydro-sedimentary dynamics and responses.

    Original languageEnglish
    Pages (from-to)593-610
    Number of pages18
    JournalEarth Surface Processes and Landforms
    Volume46
    Issue number3
    Early online date14 Dec 2020
    DOIs
    Publication statusPublished - 15 Mar 2021

    Bibliographical note

    This is the peer reviewed version of the following article 'Generation of realistic
    synthetic catchments to explore fine continental surface processes', Earth Surface Processes and Landforms, vol. 46, no. 3, pp. 593-610, which has been published in final form at https://doi.org/10.1002/esp.5048. This article may be used for noncommercial purposes in accordance with Wiley Terms and Conditions for SelfArchiving.

    This document is the author’s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.

    Funder


    This work was financed by the Seine Normandy Water Agency (AESN) and also obtained financial support from the OZCAR Research Infrastructure (French Critical Zone Observatories, Research and Applications) through the Réseau de Bassins Versants (RBV).

    Keywords

    • CAESAR-Lisflood
    • controllable physical characteristics
    • GIS processing
    • procedural generation
    • realistic virtual catchments

    ASJC Scopus subject areas

    • Geography, Planning and Development
    • Earth-Surface Processes
    • Earth and Planetary Sciences (miscellaneous)

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