{"id":8398,"date":"2016-04-06T09:58:00","date_gmt":"2016-04-06T08:58:00","guid":{"rendered":"http:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/general\/glacialisme-a-aiguestortes\/"},"modified":"2016-07-11T16:29:32","modified_gmt":"2016-07-11T15:29:32","slug":"glacialisme-a-aiguestortes","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/general\/glacialisme-a-aiguestortes\/","title":{"rendered":"Glacialisme a Aig\u00fcestortes"},"content":{"rendered":"

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\u00a0INS Eugeni Xammar, l’Ametlla del Vall\u00e8s<\/span><\/strong><\/div>\n
\u00a0<\/span><\/div>\n
\"stesperit\"<\/a><\/div>\n
Horn i cresta glacials des del mirador de Sant Esperit, formacions geol\u00f2giques t\u00edpiques del modelatge glacial<\/em><\/div>\n
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Amb els i les alumnes de 4rt d’ESO de l’INS Eugeni Xammar de l’Ametlla del Vall\u00e8s hem fet una ruta pel Parc Nacional d’Aig\u00fcestortes, resseguint la ribera de Sant Nicolau. La nostra tasca avui ha estat gaudir i entendre l’espectacular paisatge del Parc. La geomorfologia del Parc t\u00e9 el seu m\u00e0xim exponent en les formes de modelat del relleu producte de les glaceres durant les glaciacions quatern\u00e0ries. L\u2019acci\u00f3 erosiva d\u2019aquestes importants masses de gel, que van ocupar un gran nombre de valls pirinenques, es fa especialment evident en aquest espai natural.
\nDurant el darrer m\u00e0xim glacial , fa uns cinquanta mil anys,\u00a0 importants glaceres es van instal\u2022lar en les valls existents. Aquest fet, va tenir com a conseq\u00fc\u00e8ncia una intensa erosi\u00f3 del relleu i un \u201crejoveniment\u201d del paisatge on els pics punxeguts, les retallades crestes, els grans circs a les cap\u00e7aleres de les valls i els nombrosos estanys excavats a la roca s\u00f3n les manifestacions m\u00e9s caracter\u00edstiques.<\/p>\n

Situats a la cap\u00e7alera de les valls,\u00a0 els circs glacials s\u00f3n segurament unes de les formes m\u00e9s vistoses i espectaculars que es poden veure al Parc. Tenen forma d\u2019amfiteatre i eren els principals indrets d\u2019acumulaci\u00f3 de la neu i el gla\u00e7 de les antigues geleres. De parets gaireb\u00e9 verticals, es troben separats entre ells per afilades crestes que compten amb pics esmolats i punxeguts que algunes vegades poder haver quedat isolats si l\u2019erosi\u00f3 glacial dels seus vessants va ser molt intensa.<\/p>\n

El pas de les geleres va deixar una empremta molt evident a les valls eixamplant-les i fent-les m\u00e9s profundes. Presenten un perfil transversal en forma de \u201cU\u201d molt caracter\u00edstic i un esglaonament longitudinal m\u00e9s o menys marcat, des de la cap\u00e7alera a la part baixa. Les valls principals actuaven de receptores del gla\u00e7 d\u2019un conjunt de valls secund\u00e0ries que un cop desapareguts els gla\u00e7os conflueixen amb la principal salvant importants desnivells que contenen cascades espectaculars. D\u2019altra banda, producte de l\u2019excavaci\u00f3 del substrat roc\u00f3s per part de les geleres, hi ha estanys de circ o de fons de vall repartits per tot el territori del Parc, m\u00e9s de 200. La duresa de les granodiorites va dificultar aquesta excavaci\u00f3, per\u00f2 tamb\u00e9 ha influ\u00eft de manera decisiva en la seva conservaci\u00f3 posterior.<\/p>\n

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\"IMG_20160407_124320\"<\/a><\/div>\n
L’estany de Llebreta, al fons de vall en forma d’U, fruit de l’erosi\u00f3 de les glaceres.\u00a0<\/em><\/div>\n
\u00a0Font: gencat.cat<\/span><\/span><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"

INS Eugeni Xammar, l’Ametlla del Vall\u00e8s<\/p>\n

Amb els i les alumnes de 4rt d’ESO de l’INS Eugeni Xammar de l’Ametlla del Vall\u00e8s hem fet una ruta pel Parc Nacional d’Aig\u00fcestortes, resseguint la ribera de Sant Nicolau. La nostra tasca avui ha estat gaudir i entendre l’espectacular paisatge del Parc.<\/p>\n","protected":false},"author":1,"featured_media":8516,"comment_status":"open","ping_status":"open","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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,29],"tags":[],"class_list":["post-8398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-portada"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/8398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/comments?post=8398"}],"version-history":[{"count":3,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/8398\/revisions"}],"predecessor-version":[{"id":8601,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/posts\/8398\/revisions\/8601"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/media\/8516"}],"wp:attachment":[{"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/media?parent=8398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/categories?post=8398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serveiseducatius.xtec.cat\/cda-valldeboi\/wp-json\/wp\/v2\/tags?post=8398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}