{"id":688,"date":"2014-03-09T08:24:58","date_gmt":"2014-03-09T07:24:58","guid":{"rendered":"http:\/\/mdemierre.speleologie.ch\/?p=688"},"modified":"2026-05-14T16:03:29","modified_gmt":"2026-05-14T15:03:29","slug":"etroitures-en-speleo","status":"publish","type":"post","link":"https:\/\/www.techt.ch\/mdemierre\/?p=688","title":{"rendered":"Etroitures en sp\u00e9l\u00e9ologie"},"content":{"rendered":"<p>En sp\u00e9l\u00e9ologie, les \u00e9troitures sont des r\u00e9tr\u00e9cissements d&rsquo;un passage dans une cavit\u00e9 qui sont franchissables souvent avec difficult\u00e9s. Ces r\u00e9tr\u00e9cissements proviennent de remplissages (argiles, sables, \u00e9boulements, concr\u00e9tions ou glace) ou plus fr\u00e9quemment de la faible section de la cavit\u00e9 dans la roche. On distingue en particulier :<\/p>\n<ul>\n<li>Les laminoirs qui sont\u00a0des galeries larges mais tr\u00e8s basses. Le franchissement est effectu\u00e9 en ramping.<\/li>\n<li>Les chati\u00e8res qui sont tr\u00e8s \u00e9troites et courtes. Ce sont des obstacles ponctuels tr\u00e8s difficiles \u00e0 franchir.<\/li>\n<li>Les m\u00e9andres qui sont l&rsquo;\u00e9quivalent des canyons en surface. Ils sont hauts et peuvent \u00eatre tr\u00e8s \u00e9troits. La progression se fait le plus souvent en hauteur dans les parties les plus larges.<\/li>\n<\/ul>\n<p>Les \u00a0\u00e9troitures\u00a0constituent le plus d\u00e9licat et le plus redoutable des obstacles rencontr\u00e9 en sp\u00e9l\u00e9ologie. Quand le casque se coince ou que les bottes sont trop longues, c&rsquo;est que c&rsquo;est tr\u00e8s \u00e9troit (!).<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Etroiture en sp\u00e9l\u00e9ologie\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/F9IRJrt0w_E?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>C&rsquo;est souvent en for\u00e7ant des \u00e9troitures que de nouvelles galeries sont d\u00e9couvertes, comme ici \u00e0 la grotte du Dragon. Et ce n&rsquo;est pas parce qu&rsquo;un passage est \u00e9troit que de vastes salles ou des puits profonds ne se trouvent pas derri\u00e8re.<\/p>\nngg_shortcode_0_placeholder\n","protected":false},"excerpt":{"rendered":"<p>En sp\u00e9l\u00e9ologie, les \u00e9troitures sont des r\u00e9tr\u00e9cissements d&rsquo;un passage dans une cavit\u00e9 qui sont franchissables souvent avec difficult\u00e9s. Ces r\u00e9tr\u00e9cissements [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1633,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-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":"","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-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":"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":""},"mobile":{"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":""}},"ngg_post_thumbnail":0,"footnotes":""},"categories":[80,2],"tags":[58,19],"class_list":["post-688","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technique-speleologie","category-technique","tag-speleo","tag-speleologie-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"En sp\u00e9l\u00e9ologie, les \u00e9troitures sont des r\u00e9tr\u00e9cissements d&#039;un passage dans une cavit\u00e9 qui sont franchissables souvent avec difficult\u00e9s. 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