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What do models tell us about water and sediment connectivity?

Baartman, Jantiene E.M.; Nunes, Joao Pedro; Masselink, Rens; Darboux, Frédéric; Bielders, Charles; Degre, Aurore; Cantreul, Vincent; Cerdan, Olivier; Grangeon, Thomas; Fiener, Peter; Wilken, Florian; Schindewolf, Marcus; Wainwright, John

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Authors

Jantiene E.M. Baartman

Joao Pedro Nunes

Rens Masselink

Frédéric Darboux

Charles Bielders

Aurore Degre

Vincent Cantreul

Olivier Cerdan

Thomas Grangeon

Peter Fiener

Florian Wilken

Marcus Schindewolf



Abstract

Connectivity has been embraced by the geosciences community as a useful concept to understand and describe hydrological functioning and sediment movement through catchments. Mathematical modelling has been used for decades to quantify and predict erosion and transport of sediments, e.g. in scenarios of land use change or conservation measures. Being intrigued by both models and the connectivity concept, as a group of modellers we aimed at investigating what different models could tell us about connectivity. Therefore, we evaluated the response of contrasted spatially-distributed models to landscape connectivity features and explained the differences based on different model structures. A total of 53 scenarios were built with varying field sizes and orientations, as well as the implementation of soil conservation measures. These scenarios were simulated, for two rainfall intensities, with five event- and process-based water and soil erosion models – EROSION3D, FullSWOF_2D, LandSoil, OpenLISEM and Watersed. Results showed that rainfall amount plays the most important role in determining relative export and connected area of runoff and sediment in all models, indicating that functional aspects of connectivity were more important than structural connectivity. As for the role of structural landscape elements, there was no overall agreement between models regarding the effects of field sizes, crop allocation pattern, and conservation practices; agreement was also low on the spatial patterns of connectivity. This overall disagreement between models was unexpected. The results of this exercise suggest that the correct parameterization of runoff and sediment production and of routing patterns may be an important issue. Thus, incorporating connectivity functions based on routing would help modelling forward. Our results also suggest that structural connectivity indices may not suffice to represent connectivity in this type of catchment (relatively simple and monotonous land cover), and functional connectivity indices should be applied.

Citation

Baartman, J. E., Nunes, J. P., Masselink, R., Darboux, F., Bielders, C., Degre, A., …Wainwright, J. (2020). What do models tell us about water and sediment connectivity?. Geomorphology, 367, Article 107300. https://doi.org/10.1016/j.geomorph.2020.107300

Journal Article Type Article
Acceptance Date Jun 11, 2020
Online Publication Date Jun 30, 2020
Publication Date 2020-10
Deposit Date Jun 30, 2020
Publicly Available Date Jul 15, 2020
Journal Geomorphology
Print ISSN 0169-555X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 367
Article Number 107300
DOI https://doi.org/10.1016/j.geomorph.2020.107300

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