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Modelling Aeolian Erosion in Presence of Vegetation

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDUPONT, Sylvain
hal.structure.identifierLaboratoire Interuniversitaire des Systèmes Atmosphériques [LISA (UMR_7583)]
dc.contributor.authorBERGAMETTI, Gilles
hal.structure.identifierLaboratoire de Mecanique des Fluides et d'Acoustique [LMFA]
dc.contributor.authorSIMOËNS, Serge
dc.date.accessioned2024-04-08T12:02:31Z
dc.date.available2024-04-08T12:02:31Z
dc.date.issued2015
dc.identifier.issn2210-9838
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196208
dc.description.abstractEnSoil erosion by wind has many environmental, climatic and health implications. Dust storm represents one of the most dramatic events related to soil erosion. The possible increase of drought events due to climate change may accentuate the frequency and severity of dust storms. Such events have a large environmental cost, especially in agricultural regions. It is therefore necessary to better understand the processes involved in aeolian erosion over heterogeneous surfaces in order to predict dust storms and to identify good landscape management practices to reduce soil erosion. Saltation is a key process in soil erosion as it is the primary driver for dust emission. In the present study, a new saltation model, forced with instantaneous velocity fields and accounting for the presence of vegetation, is introduced in a Large-Eddy Simulation (LES) airflow model. In a first part, the coupled model is tested on a flat erodible surface under various wind conditions. Compared to previous saltation models, the present model is able to simulate explicitly turbulent eddies of the flow and their complete interaction with saltating processes. In the simulations, the saltation intermittency is visualized through the presence of blowing sand structures near the surface, known as aeolian streamers. This is the first time that such structures are reproduced numerically. From a correlation analysis, we confirm previous thoughts that these sand structures are a visual footprint of past turbulent eddies propagating in the surface boundary layer.The standard deviation of the saltation flux associated to these saltation patterns represents about 10 to 20% of the mean saltation flux. In a second part, the sensitivity of soil erosion to different arrangement and type of plants (bushes versus trees) is analyzed and the wind erosion reduction is quantified.
dc.language.isoen
dc.publisherElsevier
dc.subjectsoil erosion
dc.subject.enaeolian streamers
dc.subject.enlarge-eddy simulation
dc.subject.ensaltation
dc.subject.envegetated surface
dc.title.enModelling Aeolian Erosion in Presence of Vegetation
dc.typeArticle de revue
dc.identifier.doi10.1016/j.piutam.2015.06.013
dc.subject.halPlanète et Univers [physics]
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnement
dc.subject.halPhysique [physics]
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphère
bordeaux.journalProcedia IUTAM
bordeaux.page91-100
bordeaux.volume17
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02329215
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02329215v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Procedia%20IUTAM&rft.date=2015&rft.volume=17&rft.spage=91-100&rft.epage=91-100&rft.eissn=2210-9838&rft.issn=2210-9838&rft.au=DUPONT,%20Sylvain&BERGAMETTI,%20Gilles&SIMO%C3%8BNS,%20Serge&rft.genre=article


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