{"id":1077,"date":"2013-08-22T11:42:29","date_gmt":"2013-08-22T10:42:29","guid":{"rendered":"http:\/\/mdemierre.speleologie.ch\/?p=1077"},"modified":"2015-01-17T22:39:17","modified_gmt":"2015-01-17T21:39:17","slug":"les-courants-dair","status":"publish","type":"post","link":"https:\/\/www.techt.ch\/mdemierre\/?p=1077","title":{"rendered":"Les courants d&rsquo;air"},"content":{"rendered":"<p>Les courants d&rsquo;air servent souvent de fil d&rsquo;Ariane aux sp\u00e9l\u00e9ologues, montrant le chemin vers la suite de la cavit\u00e9. C&rsquo;est aussi un \u00e9l\u00e9ment primordial permettant de d\u00e9couvrir de nouvelles cavit\u00e9s.<\/p>\n<p>Pour les d\u00e9tecter et les comprendre, la solution la plus simple et la plus \u00e9conomique consiste \u00e0 utiliser des b\u00e2tons d\u2019encens et observer la trajectoire de leur fum\u00e9e.<\/p>\n<p>Pour tracer des courants d&rsquo;air, le gaz banane (ac\u00e9tate d&rsquo;isopentyle) est une bonne solution. Test\u00e9 avec succ\u00e8s \u00e0 plusieurs reprise ! Il faut cependant se m\u00e9fier, car ce gaz est un signe de ralliement des abeilles pour l&rsquo;attaque.<\/p>\n<p><span style=\"text-decoration: underline;\">Tube \u00e0 vent (cavit\u00e9 \u00e0 deux entr\u00e9es \u00e0 des altitudes diff\u00e9rentes) :<\/span><\/p>\n<ul>\n<li>\u00c9t\u00e9 \u2192\u00a0courant d\u2019air descendant depuis l&rsquo;entr\u00e9e sup\u00e9rieure (trou aspireur) pour ressortir \u00e0 l&rsquo;entr\u00e9e inf\u00e9rieure.<\/li>\n<li>Hiver \u2192\u00a0courant d\u2019air montant depuis l&rsquo;entr\u00e9e inf\u00e9rieure vers l&rsquo;entr\u00e9e sup\u00e9rieure (trou souffleur)<\/li>\n<\/ul>\n<p>Une entr\u00e9e avec un courant d&rsquo;air aspireur en \u00e9t\u00e9 et souffleur en hiver est souvent la t\u00eate de r\u00e9seau (!). Il est donc essentiel de chercher ce genre de cavit\u00e9&#8230; Cependant, il est en \u00e9t\u00e9 difficile de rep\u00e9rer les trous aspireurs et il faut donc privil\u00e9gier la prospection hivernale.<\/p>\n<p><span style=\"text-decoration: underline;\">Pi\u00e8ge \u00e0 air froid (cavit\u00e9 descendante) :<\/span><\/p>\n<ul>\n<li>\u00c9t\u00e9 \u2192 pas de courant d\u2019air<\/li>\n<li>Hiver \u2192\u00a0\u00e9change d\u2019air (l&rsquo;air froid ext\u00e9rieur descend dans la cavit\u00e9 pour y chasser \u00a0l&rsquo;air plus chaud qui ressort par le plafond)<\/li>\n<\/ul>\n<p>Dans les cavit\u00e9s peu volumineuses, ces courants d&rsquo;airs sont pas\/peu perceptibles.<\/p>\n<p><span style=\"text-decoration: underline;\">Pi\u00e8ge \u00e0 air air chaud (cavit\u00e9 montante) :<\/span><\/p>\n<ul>\n<li>\u00c9t\u00e9 \u2192 \u00e9change d\u2019air (l&rsquo;air chaud ext\u00e9rieur monte dans la cavit\u00e9 pour y chasser l&rsquo;air plus frais, qui ressort de la cavit\u00e9 en coulant sur le sol)<\/li>\n<li>Hiver \u2192\u00a0pas de courant d\u2019air<\/li>\n<\/ul>\n<p>Dans les cavit\u00e9s peu volumineuses, ces courants d&rsquo;airs sont pas\/peu perceptibles.<\/p>\n<p><span style=\"text-decoration: underline;\">Autres courants d&rsquo;air :<\/span><\/p>\n<ul>\n<li>Des courants d&rsquo;airs apparaissent aussi \u00e0 proximit\u00e9 des rivi\u00e8res souterraines.<\/li>\n<li>Lors de brusques changements de pression, des courants d&rsquo;airs signifie de gros volumes de vide&#8230;<\/li>\n<li>La mise en charge des r\u00e9seau peut aussi chasser l&rsquo;air et provoquer des courants d&rsquo;airs<\/li>\n<\/ul>\n<p><strong><span style=\"text-decoration: underline;\">R\u00e9f\u00e9rences :<\/span><\/strong><\/p>\n<ul>\n<li><span style=\"text-decoration: underline; color: #0000ff;\"><a href=\"http:\/\/mdemierre.speleologie.ch\/wp-content\/uploads\/climatologie_monde_souterrain-tome1.pdf\"><span style=\"color: #0000ff; text-decoration: underline;\">Climatologie\u00a0du monde souterrain, tome 1, vent des t\u00e9n\u00e8bres,\u00a0Baudouin LISMONDE<\/span><\/a><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><span style=\"color: #0000ff;\"><a href=\"http:\/\/mdemierre.speleologie.ch\/wp-content\/uploads\/climatologie_monde_souterrain-tome2.pdf\"><span style=\"color: #0000ff; text-decoration: underline;\">Climatologie du monde souterrain, tome 2, a\u00e9rologie des syst\u00e8mes karstiques, Baudouin LISMONDE<\/span><\/a><\/span><\/span><\/li>\n<li><span style=\"text-decoration: underline; color: #0000ff;\"><a href=\"http:\/\/mdemierre.speleologie.ch\/wp-content\/uploads\/climatologie_monde_souterrain-corrections.pdf\"><span style=\"text-decoration: underline; color: #0000ff;\">climatologie_du monde_souterrain &#8211; corrections<\/span><\/a><\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les courants d&rsquo;air servent souvent de fil d&rsquo;Ariane aux sp\u00e9l\u00e9ologues, montrant le chemin vers la suite de la cavit\u00e9. C&rsquo;est [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1271,"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":"","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-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":[79,2],"tags":[19,20],"class_list":["post-1077","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technique-souterrain","category-technique","tag-speleologie-2","tag-ventilation"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Les courants d&#039;air servent souvent de fil d&#039;Ariane aux sp\u00e9l\u00e9ologues, montrant le chemin vers la suite de la cavit\u00e9. 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