{"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\/da\/monster_waves_tracked_from_space\/","title":{"rendered":"Monsterb\u00f8lger sporet fra rummet"},"content":{"rendered":"
\n

R\u00e9union i Det Indiske Ocean er for de fleste indbegrebet af et tropisk paradis. Den 12. maj 2007 blev det smukke turistm\u00e5l imidlertid ramt af b\u00f8lger p\u00e5 op til 11 meter. De voldsomme b\u00f8lger for\u00e5rsagede kaos og \u00f8del\u00e6ggelse: to fiskere blev meldt savnet, flere moler styrtede sammen, og boliger og hoteller blev oversv\u00f8mmet.<\/p>\n<\/div>\n

Begivenhederne, der f\u00f8rte frem til denne \u00f8del\u00e6ggelse, er blevet registreret af et radarinstrument ombord p\u00e5 ESA\u2019s Envisat-satellit. Dette instrument sender radiosignaler ud mod havoverfladen og opfanger ekkoerne. Disse ekkoer giver forskerne oplysninger om b\u00f8lgernes st\u00f8rrelse, h\u00f8jde og hastighed. I forbindelse med oversv\u00f8mmelserne p\u00e5 R\u00e9union viste Envisat, at b\u00f8lgerne stammede fra en stor storm i det sydlige Atlanterhav. I l\u00f8bet af de f\u00f8lgende tre dage spredte de sig v\u00e6k fra stormens centrum. Nogle b\u00f8lger bev\u00e6gede sig n\u00e6sten 4.000 km mod nord\u00f8st, f\u00f8r de ramte R\u00e9union med fuld kraft.<\/p>\n

\"Observation
Observation af stormvindene<\/figcaption><\/figure>\n

Selvom der var varslet b\u00f8lger mod \u00f8en, forventedes de generelt kun at v\u00e6re et par meter h\u00f8je. En analyse af Envisat-data viser imidlertid, at b\u00f8lgerne var omkring 5 meter h\u00f8je og l\u00e5 med store mellemrum p\u00e5 det \u00e5bne hav. Et stort mellemrum mellem b\u00f8lgerne er et tegn p\u00e5, at de var for\u00e5rsaget af stormvinde. Da b\u00f8lgerne n\u00e6rmede sig kysten, aftog deres hastighed, og h\u00f8jden fordobledes.<\/p>\n

\u201cB\u00f8lger er stadig en uforudsigelig faktor, som desv\u00e6rre kan v\u00e6re livsfarlig,\u201d sagde Bertrand Chapron fra IFREMER, det franske forskningsinstitut for udnyttelse af havet. \u201cI den n\u00e6rmeste fremtid regner vi med at bruge SAR-b\u00f8lgedata (rumradar) til at forudsige deres ankomsttidspunkt og intensitet.\u201d<\/p>","protected":false},"excerpt":{"rendered":"

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 […]<\/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\/da\/wp-json\/wp\/v2\/posts\/1026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=1026"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1026\/revisions"}],"predecessor-version":[{"id":4803,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/1026\/revisions\/4803"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=1026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=1026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=1026"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=1026"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=1026"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=1026"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=1026"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=1026"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=1026"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=1026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}