{"id":15433,"date":"2023-10-17T15:08:19","date_gmt":"2023-10-17T13:08:19","guid":{"rendered":"https:\/\/www.venicecitytours.it\/les-causes-de-lacqua-alta-a-venise\/"},"modified":"2025-06-24T12:42:11","modified_gmt":"2025-06-24T10:42:11","slug":"les-causes-de-lacqua-alta-a-venise","status":"publish","type":"post","link":"https:\/\/www.venicecitytours.it\/fr\/informations-utiles\/les-causes-de-lacqua-alta-a-venise\/","title":{"rendered":"Les causes de l&rsquo;Acqua Alta \u00e0 Venise"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"15433\" class=\"elementor elementor-15433 elementor-2809\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3dccc5e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3dccc5e\" data-element_type=\"section\" data-e-type=\"section\" id=\"contenuto\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f304334\" data-id=\"f304334\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4ff5b8d elementor-toc--minimized-on-desktop elementor-widget elementor-widget-table-of-contents\" data-id=\"4ff5b8d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;container&quot;:&quot;article&quot;,&quot;minimized_on&quot;:&quot;desktop&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;no_headings_message&quot;:&quot;Non sono state trovate intestazioni in questa pagina.&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<div class=\"elementor-toc__header-title\">\n\t\t\t\tIndex\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__4ff5b8d\" aria-expanded=\"true\" aria-label=\"Ouvrir la table des mati\u00e8res\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__4ff5b8d\" aria-expanded=\"true\" aria-label=\"Fermer la table des mati\u00e8res\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__4ff5b8d\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b0ba90 elementor-widget elementor-widget-heading\" data-id=\"0b0ba90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Pourquoi y a-t-il de l'Acqua Alta \u00e0 Venise ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-393d8b0 elementor-widget elementor-widget-text-editor\" data-id=\"393d8b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les causes de la <strong><a href=\"https:\/\/www.venicecitytours.it\/fr\/informations-utiles\/quest-ce-que-lacqua-alta-a-venise\/\" target=\"_blank\" rel=\"noopener\">Acqua Alta<\/a><\/strong> \u00e0 Venise peuvent \u00eatre divis\u00e9es en deux grandes cat\u00e9gories de raisons : <strong>m\u00e9t\u00e9orologiques et astronomiques<\/strong>. La lagune de Venise est situ\u00e9e \u00e0 l&rsquo;extr\u00e9mit\u00e9 nord de la mer Adriatique. Lorsqu&rsquo;<strong>un fort vent du sud<\/strong> (le Sirocco du sud-est) <strong>souffle<\/strong> sur le bassin de l&rsquo;Adriatique pendant une longue p\u00e9riode, des masses d&rsquo;eau de mer sont transport\u00e9es vers le nord.<\/p><p><strong>Lorsqu&rsquo;ils trouvent l&#8217;embouchure de la lagune<\/strong>, ils entrent par les bouches qui s&rsquo;ouvrent entre les bancs de sable. Le vent doit souffler imp\u00e9tueusement et longtemps pour que cette situation se produise. Le vent fort de la bora, qui vient du nord\/nord-est, peut \u00e9galement provoquer des mar\u00e9es hautes \u00e0 Venise, surtout s&rsquo;il entre en collision avec le sirocco. <strong>Le vent pousse alors les masses d&rsquo;eau de mer dans la lagune.<\/strong><\/p><p><strong>Un autre ph\u00e9nom\u00e8ne m\u00e9t\u00e9orologique<\/strong> \u00e0 l&rsquo;origine de l&rsquo;Acqua Alta \u00e0 Venise est li\u00e9 aux grandes <strong>perturbations atmosph\u00e9riques<\/strong>. Une zone de basse pression dans la partie sup\u00e9rieure de l&rsquo;Adriatique et de haute pression dans la partie sud de l&rsquo;Adriatique entra\u00eene un d\u00e9placement de l&rsquo;eau vers le nord du bassin, ce qui provoque une \u00e9l\u00e9vation du niveau de plusieurs centim\u00e8tres. Les fluctuations du niveau de l&rsquo;Adriatique, connues en hydrologie sous le nom de seiches, ont une grande influence sur les grandes mar\u00e9es dans la lagune.<\/p><p>En ce qui concerne les <strong>facteurs astronomiques<\/strong>, il faut dire qu&rsquo;en M\u00e9diterran\u00e9e, les <strong>mar\u00e9es astronomiques<\/strong> <strong>(principalement li\u00e9es \u00e0 la Lune)<\/strong> sont beaucoup moins prononc\u00e9es que dans l&rsquo;oc\u00e9an, mais ce n&rsquo;est pas pour autant qu&rsquo;elles en sont absentes. Dans certaines situations, <strong>lorsque les grandes mar\u00e9es astronomiques s&rsquo;ajoutent aux conditions m\u00e9t\u00e9orologiques d\u00e9crites ci-dessus<\/strong>, il peut y avoir des grandes mar\u00e9es plus importantes. Cependant, la grande mar\u00e9e astronomique ne co\u00efncide pas toujours avec l&rsquo;apparition des facteurs m\u00e9t\u00e9orologiques \u00e0 l&rsquo;origine de la grande mar\u00e9e.<\/p><p><strong>Les facteurs g\u00e9ologiques et climatiques font \u00e9galement partie des causes de l&rsquo;Acqua Alta \u00e0 Venise<\/strong>. Venise est sujette \u00e0 une forte subsidence, comme l&rsquo;affaissement du sol caus\u00e9 par l&rsquo;<strong>intervention humaine<\/strong>, par exemple avec le drainage des eaux souterraines d\u00fb \u00e0 l&rsquo;industrialisation du territoire c\u00f4tier au cours des 20 derni\u00e8res ann\u00e9es.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-acbfcc4 elementor-widget elementor-widget-heading\" data-id=\"acbfcc4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Le niveau z\u00e9ro cm de l'Acqua Alta \u00e0 Venise<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cc3aa46 elementor-widget elementor-widget-image\" data-id=\"cc3aa46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"500\" height=\"315\" src=\"https:\/\/www.venicecitytours.it\/wp-content\/uploads\/2023\/10\/acqua-alta-di-venezia.jpg\" class=\"attachment-large size-large wp-image-15410\" alt=\"Piazza San Marco allagata durante un episodio di acqua alta, con la Basilica e il Campanile che si riflettono sulla superficie ondulata.\" srcset=\"https:\/\/www.venicecitytours.it\/wp-content\/uploads\/2023\/10\/acqua-alta-di-venezia.jpg 500w, https:\/\/www.venicecitytours.it\/wp-content\/uploads\/2023\/10\/acqua-alta-di-venezia-300x189.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6b6e5b2 elementor-widget elementor-widget-text-editor\" data-id=\"6b6e5b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Pour r\u00e9pondre \u00e0 cette question, il faut d&rsquo;abord \u00e9tablir un point de r\u00e9f\u00e9rence et une dimension pour chaque<strong> ph\u00e9nom\u00e8ne de crue<\/strong>.<\/p><p><strong>Le niveau z\u00e9ro id\u00e9ographique \u00e0 partir duquel sont mesur\u00e9s les \u00e9pisodes de<\/strong> mar\u00e9e haute \u00e0 Venise a \u00e9t\u00e9 choisi de mani\u00e8re conventionnelle ; il est situ\u00e9 \u00e0 <strong>Punta della Salute<\/strong>. Une mar\u00e9e de <strong>140 centim\u00e8tres<\/strong> ou plus <strong>au-dessus du z\u00e9ro id\u00e9ographique \u00e0 <\/strong><strong>Punta della Salute<\/strong> est consid\u00e9r\u00e9e comme exceptionnelle.   <\/p><p>Ce ph\u00e9nom\u00e8ne se produit en moyenne une fois tous les trois ans. Les mar\u00e9es exceptionnelles sup\u00e9rieures \u00e0 140 cm entra\u00eenent des inondations dans environ 57 % de la ville, selon les donn\u00e9es de la municipalit\u00e9 de Venise. Dans ce cas, le code d&rsquo;alerte rouge est affich\u00e9 dans la ville.    <strong>Les sir\u00e8nes retentissent et avertissent les citoyens et les touristes de la situation d&rsquo;alarme.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7d09175 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7d09175\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7d4fcba\" data-id=\"7d4fcba\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les causes de l&rsquo;Acqua Alta \u00e0 Venise peuvent \u00eatre divis\u00e9es en deux grandes cat\u00e9gories de raisons : m\u00e9t\u00e9orologiques et astronomiques.<\/p>\n","protected":false},"author":2,"featured_media":15434,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[385],"tags":[],"class_list":["post-15433","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informations-utiles"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Les causes de l&#039;Acqua Alta \u00e0 Venise Venice Tours<\/title>\n<meta name=\"description\" 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