{"id":1026,"date":"2007-05-17T11:16:00","date_gmt":"2007-05-17T09:16:00","guid":{"rendered":"https:\/\/kids.esa.int\/monster_waves_tracked_from_space\/"},"modified":"2026-10-08T00:35:02","modified_gmt":"2026-10-07T22:35:02","slug":"monster_waves_tracked_from_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/monster_waves_tracked_from_space\/","title":{"rendered":"Les vagues g\u00e9antes pist\u00e9es depuis l'espace"},"content":{"rendered":"<div class=\"lede\">\n<p>Au c\u0153ur de l'oc\u00e9an indien, l'\u00eele de la R\u00e9union incarne \u00e0 la perfection l'id\u00e9e que nous nous faisons tous du paradis tropical. Le 12 mai 2007 cependant, cet \u00e9den touristique a \u00e9t\u00e9 fouett\u00e9 par des vagues qui ont atteint une hauteur record de 11 m\u00e8tres. Le train de d\u00e9ferlantes a laiss\u00e9 derri\u00e8re lui le chaos et des d\u00e9g\u00e2ts importants : deux p\u00eacheurs manquent \u00e0 l'appel, plusieurs quais se sont effondr\u00e9s et des maisons et des h\u00f4tels ont \u00e9t\u00e9 inond\u00e9s.<\/p>\n<\/div>\n<p>Les \u00e9v\u00e9nements qui ont pr\u00e9c\u00e9d\u00e9 cette destruction ont \u00e9t\u00e9 enregistr\u00e9s par un instrument radar embarqu\u00e9 sur le satellite Envisat de l'ESA. Cet instrument \u00e9met des signaux radio et re\u00e7oit en retour les \u00e9chos r\u00e9fl\u00e9chis par la surface de la mer. Ce sont ces \u00e9chos qui renseignent les chercheurs sur la taille, la hauteur et la vitesse des vagues. Dans le cas de l'\u00e9norme houle r\u00e9unionnaise, Envisat a montr\u00e9 que les vagues avaient pour origine une grosse temp\u00eate en Atlantique Sud. Les vagues se sont propag\u00e9es pendant les trois jours qui ont suivi, certaines ont ainsi voyag\u00e9 vers le Nord-Est sur pr\u00e8s de 4 000 km avant d\u2019atteindre la R\u00e9union.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"3508\" data-credit=\"ECMWF, NASA Quikscat\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/05\/Observation_of_the_storm_winds2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/05\/observation_of_the_storm_winds2\/17878182-2-eng-GB\/Observation_of_the_storm_winds.jpg\" alt=\"Observation of the storm winds\"><figcaption>Observation des vents de temp\u00eate<\/figcaption><\/figure>\n<p>Si l'arriv\u00e9e d'une houle sur l'\u00eele avait \u00e9t\u00e9 annonc\u00e9e, il n'\u00e9tait pas pr\u00e9vu que les vagues d\u00e9passent les deux m\u00e8tres de haut. L'analyse des donn\u00e9es d'Envisat montre toutefois que les vagues mesuraient d\u00e9j\u00e0 pr\u00e8s de cinq m\u00e8tres de haut et \u00e9taient tr\u00e8s espac\u00e9es en mer ouverte. Un long intervalle entre les vagues indique que celles-ci ont \u00e9t\u00e9 caus\u00e9es par des vents de temp\u00eate. \u00c0 l'approche du littoral, les vagues ont ralenti et doubl\u00e9 en hauteur.<\/p>\n<p>\u201c La houle reste un facteur impr\u00e9visible, qui peut malheureusement s'av\u00e9rer mortel \u201d, a d\u00e9clar\u00e9 Bertrand Chapron, de l'IFREMER (Institut fran\u00e7ais de recherche pour l'exploitation de la mer). \u201c Dans un avenir proche, nous pr\u00e9voyons d'utiliser les donn\u00e9es sur la houle fournies par le SAR (radar spatial) pour pr\u00e9voir son heure d'arriv\u00e9e et son intensit\u00e9. \u201d<\/p>","protected":false},"excerpt":{"rendered":"<p>Reunion Island in the Indian Ocean is everyone\u2019s idea of a tropical paradise. However, on 12 May 2007, the beautiful tourist spot was lashed by waves up to 11 metres [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2007\/05\/swell_propagating_across_the_indian_ocean2\/17884879-2-eng-GB\/Swell_propagating_across_the_Indian_Ocean.gif","esa_banner_description":"Swell propagating across the Indian Ocean","esa_banner_credit":"IFREMER - BOOST Technologies","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/05\/Swell_propagating_across_the_Indian_Ocean2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,59],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1026","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-natural-disasters"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=1026"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1026\/revisions"}],"predecessor-version":[{"id":4803,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1026\/revisions\/4803"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1026"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1026"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1026"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1026"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1026"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1026"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1026"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}