{"id":3293,"date":"2021-07-01T09:41:00","date_gmt":"2021-07-01T07:41:00","guid":{"rendered":"http:\/\/www.hydrosciences.org\/?p=3293"},"modified":"2021-07-01T09:41:00","modified_gmt":"2021-07-01T07:41:00","slug":"mecanismes-de-formation-des-crues-cevenoles-transfert-de-masse-ou-de-pression","status":"publish","type":"post","link":"https:\/\/www.hydrosciences.org\/?p=3293&lang=fr","title":{"rendered":"M\u00e9canismes de formation des crues c\u00e9venoles : transfert de masse ou de pression ?"},"content":{"rendered":"\n

Pr\u00e9sentation de Christophe Bouvier, chercheur IRD affect\u00e9 \u00e0 HydroSciences, le 17 juin 2021 dans le cadre des s\u00e9minaires HSM<\/p>\n\n\n\n

R\u00e9sum\u00e9 :<\/strong><\/em><\/p>\n\n\n\n

Les crues c\u00e9venoles sont connues pour leur soudainet\u00e9 et leur ampleur. Ces crues ont fait l’objet de diverses \u00e9tudes, mais les processus hydrologiques \u00e0 l\u2019origine de ces crues restent mal connus.<\/p>\n\n\n\n

L’objectif de cette pr\u00e9sentation est de r\u00e9sumer les r\u00e9sultats et les conclusions d’un article r\u00e9cemment paru dans Hydrological Processes, caract\u00e9risant les flux d’eau verticaux et lat\u00e9raux dans la zone critique (0-10m) lors des pluies intenses.<\/p>\n\n\n\n

L’\u00e9tude concerne une parcelle de 10 m2<\/sup>, suivie sous pluies naturelles et sous pluies artificielles, situ\u00e9e en zone granitique.<\/p>\n\n\n\n

Les transferts d’eau sont suivis par diff\u00e9rents capteurs de mesure sous-jacents \u00e0 la parcelle : teneurs en eau, pi\u00e9zom\u00e8tres, tra\u00e7ages et r\u00e9sistivit\u00e9s \u00e9lectriques dans la zone 0-1m, pi\u00e9zom\u00e8tre profond dans la zone 0-10m.<\/p>\n\n\n\n

Les r\u00e9sultats montrent que les pluies sont infiltr\u00e9es en totalit\u00e9 en surface, que les flux sont essentiellement verticaux dans la zone 0-10m, et que des flux lat\u00e9raux apparaissent en profondeur, \u00e0 la base de cette zone.<\/p>\n\n\n\n

Les vitesses de transfert, relativement rapides, ne permettent pas cependant d’expliquer les temps de r\u00e9ponse tr\u00e8s courts des bassins c\u00e9venols par un transfert de masse, et laissent penser que le d\u00e9clenchement<\/p>\n\n\n\n

des crues c\u00e9venoles est d\u00fb \u00e0 la propagation d’une onde de pression le long du versant.<\/p>\n","protected":false},"excerpt":{"rendered":"

Pr\u00e9sentation de Christophe Bouvier, chercheur IRD affect\u00e9 \u00e0 HydroSciences, le 17 juin 2021 dans le cadre des s\u00e9minaires HSM R\u00e9sum\u00e9 : Les crues c\u00e9venoles sont connues pour leur soudainet\u00e9 et leur ampleur. Ces crues ont fait l’objet de diverses \u00e9tudes, mais les processus hydrologiques \u00e0 l\u2019origine de ces crues restent mal connus. L’objectif de cette …<\/p>\n

M\u00e9canismes de formation des crues c\u00e9venoles : transfert de masse ou de pression ?<\/span> Lire la suite \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":3249,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[16],"tags":[],"class_list":["post-3293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-toutes-les-actualites-et-seminaires"],"yoast_head":"\nM\u00e9canismes de formation des crues c\u00e9venoles : transfert de masse ou de pression ? - HydroSciences Montpellier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hydrosciences.org\/?p=3293&lang=fr\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e9canismes de formation des crues c\u00e9venoles : transfert de masse ou de pression ? - HydroSciences Montpellier\" \/>\n<meta property=\"og:description\" content=\"Pr\u00e9sentation de Christophe Bouvier, chercheur IRD affect\u00e9 \u00e0 HydroSciences, le 17 juin 2021 dans le cadre des s\u00e9minaires HSM R\u00e9sum\u00e9 : Les crues c\u00e9venoles sont connues pour leur soudainet\u00e9 et leur ampleur. 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