{"id":409,"date":"2025-04-11T15:02:39","date_gmt":"2025-04-11T13:02:39","guid":{"rendered":"https:\/\/www.meteor-oi.re\/?page_id=409"},"modified":"2026-08-17T11:15:28","modified_gmt":"2026-08-17T09:15:28","slug":"le-risque-houle-marees-a-la-reunion","status":"publish","type":"page","link":"https:\/\/www.meteor-oi.re\/index.php\/les-risques-naturels-a-la-reunion\/le-risque-houle-marees-a-la-reunion\/","title":{"rendered":"Le risque \u00ab\u00a0houle\/mar\u00e9es\u00a0\u00bb \u00e0 La R\u00e9union"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Pour conclure le triptyque aqueux des risques naturels \u00e0 la R\u00e9union, il convient d\u2019augmenter la salinit\u00e9 d\u2019un bon cran en se penchant sur les dangers de la submersion marine. Le plus souvent il s\u2019agit d\u2019un ph\u00e9nom\u00e8ne esth\u00e9tique qui ravit les badauds et amateurs de sensations fortes pr\u00e8s de la pointe au sel. Attention toutefois \u00e0 ne pas en sous-estimer la puissance&nbsp;! La moindre erreur se payant au prix fort. Au surplus, il arrive que l\u2019oc\u00e9an Indien rev\u00eate des atours autrement plus sinistre. Que ce soit sous l\u2019action du vent pour les houles classiques ou de la sismicit\u00e9 pour les tsunamis. Dans les deux cas, les vagues sont des ondes se propageant \u00e0 la surface des oc\u00e9ans. Plus la longueur d\u2019onde sera importante, plus l\u2019\u00e9nergie g\u00e9n\u00e9r\u00e9e sera grande et potentiellement dangereuse pour les c\u00f4tes expos\u00e9es. Nous nous concentrerons principalement sur trois des aspects les plus redoutables de ce ph\u00e9nom\u00e8ne&nbsp;:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La houle cyclonique<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2025\/04\/Houle_cyclonique_Belal_Barachois_La_Reunion.webp\" alt=\"Houle cyclonique lors du cyclone Belal (2024) \u00e0 La R\u00e9union\" class=\"wp-image-561\" srcset=\"https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2025\/04\/Houle_cyclonique_Belal_Barachois_La_Reunion.webp 1000w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2025\/04\/Houle_cyclonique_Belal_Barachois_La_Reunion-300x200.webp 300w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2025\/04\/Houle_cyclonique_Belal_Barachois_La_Reunion-768x512.webp 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">Houle cyclonique lors du cyclone Belal (2024) \u00e0 La R\u00e9union<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">En lien avec le risque cyclone \u00e9voqu\u00e9 pr\u00e9c\u00e9demment, il ne faut pas confondre la houle cyclonique et l\u2019onde de temp\u00eate. Si la seconde est une hausse du niveau de l\u2019oc\u00e9an due \u00e0 la baisse de pression atmosph\u00e9rique, la premi\u00e8re est li\u00e9e aux vents de surface engendr\u00e9s par les syst\u00e8mes tropicaux. En th\u00e9orie, plus ceux-ci seront importants, plus violente sera la houle, m\u00eame si de nombreux facteurs entrent en compte. La houle cyclonique est g\u00e9n\u00e9ralement un signe avant-coureur de l\u2019approche d\u2019un cyclone tropical. Attention toutefois, certains syst\u00e8mes de d\u00e9placent si rapidement qu\u2019ils se d\u00e9placent aussi vite que leur houle cyclonique comme en 1932, avec Jenny en 1962 ou Fakir en 2018&nbsp;! Donc l\u2019absence de houle ne signifie pas forc\u00e9ment absence de syst\u00e8me dangereux pr\u00e8s de nos c\u00f4tes&nbsp;!<\/p>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Selon son intensit\u00e9, la houle cyclonique pourra charrier des mat\u00e9riaux plus ou moins lourds sur le rivage. Ainsi pendant Dina et Colina des rochers de bonne taille avaient fini sur la route et \u00e0 proximit\u00e9 de certains b\u00e2timents. Des photos historiques du Barachois cons\u00e9cutives au passage du cyclone de 1948 laissent \u00e9galement songeur sur la taille des vagues. Conjugu\u00e9e \u00e0 une onde de temp\u00eate, une houle cyclonique peut vraiment constituer un danger important pour les littoraux et si leur beaut\u00e9 hypnotique est attirante, il est crucial de respecter une distance de s\u00e9curit\u00e9 raisonnable pour jouir du spectacle. Enfin avant tout passage en alerte rouge ou violette, bien s\u00fbr !<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La houle australe<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<p class=\"wp-block-paragraph\">Ph\u00e9nom\u00e8ne beaucoup plus fr\u00e9quent et caract\u00e9ristique des hivers austraux, la houle australe est due, comme son nom l\u2019indique, \u00e0 des syst\u00e8mes subtropicaux et des remont\u00e9es anticycloniques provenant de tr\u00e8s loin au sud de La R\u00e9union. Tr\u00e8s esth\u00e9tiques, elles participent de la renomm\u00e9e de La R\u00e9union comme terre d\u2019extr\u00eames. N\u00e9anmoins, les habitants des littoraux sud et ouest accueillent g\u00e9n\u00e9ralement cette nouvelle avec plus de r\u00e9serve. En effet, les houles les plus puissantes peuvent endommager le r\u00e9seau routier voire certains b\u00e2timents c\u00f4tiers. La grande houle de mai 2007 reste un souvenir douloureux pour nombre d\u2019habitants des rivages expos\u00e9s.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe-1024x682.webp\" alt=\"Houle australe \u00e0 La R\u00e9union\" class=\"wp-image-1142\" srcset=\"https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe-1024x682.webp 1024w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe-300x200.webp 300w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe-768x512.webp 768w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe-1536x1023.webp 1536w, https:\/\/www.meteor-oi.re\/wp-content\/uploads\/2026\/08\/Houle_australe.webp 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Les tsunamis<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Les tsunamis du 26 d\u00e9cembre 2004 dans le nord de l\u2019oc\u00e9an Indien et de mars 2011 au Japon ont appos\u00e9 un sceau de tristesse dans les m\u00e9moires collectives. Ils sont g\u00e9n\u00e9ralement caus\u00e9s par des s\u00e9ismes profonds, notamment dans les zones dites de subduction entre deux plaques tectoniques. Il arrive parfois qu\u2019une plaque glisse violemment de plusieurs dizaines de centim\u00e8tres ou plus sous une autre, lib\u00e9rant alors une \u00e9nergie colossale. Le s\u00e9isme ainsi g\u00e9n\u00e9r\u00e9 lib\u00e8re une onde qui va se propager en soulevant des masses d\u2019eau consid\u00e9rables qui deviennent des vagues g\u00e9antes, atteignant plusieurs kilom\u00e8tres de long en approchant des c\u00f4tes. Les d\u00e9g\u00e2ts sont g\u00e9n\u00e9ralement consid\u00e9rables tant au niveau humain que mat\u00e9riel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quid de La R\u00e9union&nbsp;? Si <a href=\"https:\/\/www.meteor-oi.re\/index.php\/les-risques-naturels-a-la-reunion\/le-risque-sismique-a-la-reunion\/\" target=\"_blank\" rel=\"noreferrer noopener\">nous ne sommes pas directement expos\u00e9s aux s\u00e9ismes de subduction<\/a>, le tsunami de 2004 \u00e9tait si violent qu\u2019une partie de l\u2019onde lib\u00e9r\u00e9e a impact\u00e9 les c\u00f4tes nord de La R\u00e9union. Les d\u00e9g\u00e2ts dans le port de Sainte Marie, rappellent que nous ne sommes pas enti\u00e8rement \u00e0 l\u2019abri d\u2019un s\u00e9isme lointain dans l\u2019oc\u00e9an Indien. Consid\u00e9rant l\u2019\u00eele, un dernier risque th\u00e9orique est li\u00e9 au volcan et aux glissements de terrain. Nous aborderons ce point dans les sections d\u00e9di\u00e9es.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quels r\u00f4les pour M\u00e9t\u00e9oR-OI&nbsp;?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un certain nombre de nos membres sont des photographes chevronn\u00e9s amateurs de houles diverses. Aussi, pouvons-nous assurer un r\u00f4le de conseil dans la pr\u00e9vision de ces ph\u00e9nom\u00e8nes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour conclure le triptyque aqueux des risques naturels \u00e0 la R\u00e9union, il convient d\u2019augmenter la salinit\u00e9 d\u2019un bon cran en se penchant sur les dangers de la submersion marine. Le plus souvent il s\u2019agit d\u2019un ph\u00e9nom\u00e8ne esth\u00e9tique qui ravit les badauds et amateurs de sensations fortes pr\u00e8s de la pointe au sel. Attention toutefois \u00e0&hellip; <br \/> <a class=\"read-more\" href=\"https:\/\/www.meteor-oi.re\/index.php\/les-risques-naturels-a-la-reunion\/le-risque-houle-marees-a-la-reunion\/\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":394,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-409","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le risque de houle\/mar\u00e9es\/tsunami \u00e0 La R\u00e9union<\/title>\n<meta name=\"description\" content=\"Risques de submersion marine \u00e0 La R\u00e9union : houle, tsunamis, impacts pass\u00e9s et r\u00f4le de veille de M\u00e9t\u00e9oR-OI sur ces ph\u00e9nom\u00e8nes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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