{"id":236,"date":"2009-12-12T21:43:11","date_gmt":"2009-12-12T20:43:11","guid":{"rendered":"http:\/\/clan.des.tritons.free.fr\/blog\/?p=236"},"modified":"2018-03-13T22:37:09","modified_gmt":"2018-03-13T21:37:09","slug":"la-grotte-du-pre-de-neyrac-lozere","status":"publish","type":"post","link":"https:\/\/clandestritons.fr\/?p=236","title":{"rendered":"La grotte du Pr\u00e9 de NEYRAC &#8211; Loz\u00e8re"},"content":{"rendered":"<address>d&rsquo;apr\u00e8s Jean Philippe GRANDCOLAS, avec la collaboration de Christophe TSCHERTER (photos) et Alexandre PONT.<\/address>\n<address> <\/address>\n<address><\/address>\n<p><span style=\"text-decoration: underline;\">Documents \u00e0 t\u00e9l\u00e9charger<\/span> <span style=\"color: #ff0000;\">(Mise \u00e0 jour 03\/2018)<\/span> :<\/p>\n<ul>\n<li><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2009_02-ind-d-topographie-toporobot.pdf\">pre-de-neyrac-2009_02-ind-d-topographie-toporobot<\/a> (fichier .pdf)<\/li>\n<li><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2009_02-ind-d-report-en-surface.pdf\">pre-de-neyrac-2009_02-ind-d-report-en-surface<\/a> (fichier .pdf)<\/li>\n<li><a href=\"\/wp-content\/uploads\/galerie\/compte-rendu-de-la-radiolocalisation-a-la-grotte-du-pre-de-neyrac-27-juin-2009.pdf\">compte-rendu-de-la-radiolocalisation-a-la-grotte-du-pre-de-neyrac-27-juin-2009<\/a><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal<\/w:View> <w:Zoom>0<\/w:Zoom> <w:TrackMoves \/> <w:TrackFormatting \/> <w:HyphenationZone>21<\/w:HyphenationZone> <w:PunctuationKerning \/> <w:ValidateAgainstSchemas \/> <w:SaveIfXMLInvalid>false<\/w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false<\/w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false<\/w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF \/> <w:LidThemeOther>FR<\/w:LidThemeOther> <w:LidThemeAsian>X-NONE<\/w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE<\/w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables \/> <w:SnapToGridInCell 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Priority=\"37\" Name=\"Bibliography\" \/> <w:LsdException Locked=\"false\" Priority=\"39\" QFormat=\"true\" Name=\"TOC Heading\" \/> <\/w:LatentStyles> <\/xml><![endif]--> <!--[if gte mso 10]>\n<mce:style><!   \/* Style Definitions *\/  table.MsoNormalTable \t{mso-style-name:\"Tableau Normal\"; \tmso-tstyle-rowband-size:0; \tmso-tstyle-colband-size:0; \tmso-style-noshow:yes; \tmso-style-priority:99; \tmso-style-qformat:yes; \tmso-style-parent:\"\"; \tmso-padding-alt:0cm 5.4pt 0cm 5.4pt; \tmso-para-margin:0cm; \tmso-para-margin-bottom:.0001pt; \tmso-pagination:widow-orphan; \tfont-size:11.0pt; \tfont-family:\"Calibri\",\"sans-serif\"; \tmso-ascii-font-family:Calibri; \tmso-ascii-theme-font:minor-latin; \tmso-fareast-font-family:\"Times New Roman\"; \tmso-fareast-theme-font:minor-fareast; \tmso-hansi-font-family:Calibri; \tmso-hansi-theme-font:minor-latin; \tmso-bidi-font-family:\"Times New Roman\"; \tmso-bidi-theme-font:minor-bidi;} --><!--[endif]--><span style=\"font-family: &amp;amp;amp;\"> par Daniel Chailloux &#8211; AREMIS \u2013 CDS94<\/span> (fichier .pdf)<\/li>\n<li><a href=\"\/wp-content\/uploads\/galerie\/grotte-du-pre-de-neyrac-2009_02.zip\">grotte-du-pre-de-neyrac-2009_02<\/a> (Fichier .kmz , \u00e0 ouvrir avec google earth)<\/li>\n<li><a href=\"\/wp-content\/uploads\/publications\/Topographies\/Neyrac\/Grotte.du.Pre.de.Neyrac_Speleo.Dossier.38_2013.pdf\" target=\"_blank\">article Sp\u00e9l\u00e9o Dossier n\u00b0 38 (2013)<\/a> par JPG (<span style=\"color: #ff6600;\">nouveau 2018<\/span> : pdf 4,7 Mo)<\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"text-decoration: underline;\">En r\u00e9sum\u00e9<\/span> : Apr\u00e8s la plong\u00e9 de Jean Pierre Baudu le d\u00e9veloppement topographi\u00e9 a atteint 1972 m pour un d\u00e9nivel\u00e9 de -4\/+30 et il en reste encore un peu \u00e0 faire (mais la t\u00eate dans l&rsquo;eau&#8230;)<\/p>\n<p style=\"text-align: justify;\">\n<p style=\"text-align: center;\"><em>Debout, la sp\u00e9l\u00e9o c&rsquo;est sympa !<\/em><a href=\"\/wp-content\/uploads\/galerie\/p9100075.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-264\" title=\"p9100075\" src=\"\/wp-content\/uploads\/galerie\/p9100075.jpg\" alt=\"\" width=\"500\" height=\"666\" srcset=\"https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p9100075.jpg 783w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p9100075-225x300.jpg 225w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p9100075-768x1024.jpg 768w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>La grotte du Pr\u00e9 de Neyrac (commune de Cubi\u00e8res &#8211; Loz\u00e8re) est d\u00e9couverte le 28 mars 2005, lors d&rsquo;une prospection dans une zone reconnue par Christophe Tscherter. Le courant d&rsquo;air nous incite \u00e0 y entamer rapidement une d\u00e9sobstruction ! la r\u00e9surgence du Rieutord (mesur\u00e9e \u00e0 20 l\/s \u00e0 l&rsquo;\u00e9tiage) sort une cinquantaine de m\u00e8tres en aval. Cette cavit\u00e9 s&rsquo;ouvre au d\u00e9bouch\u00e9 d&rsquo;une vall\u00e9e s\u00e8che, sur le flanc nord du Mont Loz\u00e8re, au contact des schistes et des calcaires de l&rsquo;Hettangien.<\/p>\n<p>Deux bonnes s\u00e9ances de d\u00e9sobstruction permettent d&rsquo;acc\u00e9der \u00e0 une suite prometteuse. Arr\u00eat sur un lac. Un mois plus tard, la vo\u00fbte mouillante est pass\u00e9e et quelques centaines de m\u00e8tres sont parcourus. Une tr\u00e9mie est forc\u00e9e, plusieurs diverticules sont explor\u00e9s, la topographie est lev\u00e9e en 3 s\u00e9ances. Le d\u00e9veloppement topographi\u00e9 de la cavit\u00e9 est de 975 m\u00e8tres.<\/p>\n<p style=\"text-align: center;\"><em>C\u2019est par l\u00e0 qu\u2019il faut passer !<\/em><\/p>\n<p><a href=\"\/wp-content\/uploads\/galerie\/p7141829.jpg\"><img decoding=\"async\" class=\"size-medium wp-image-261 aligncenter\" title=\"p7141829\" src=\"\/wp-content\/uploads\/galerie\/p7141829-300x225.jpg\" alt=\"\" width=\"494\" height=\"368\" \/><\/a><\/p>\n<p>A posteriori, nous avons profit\u00e9 de l\u2019\u00e9tiage exceptionnel de 2005 pour p\u00e9n\u00e9trer dans la cavit\u00e9. Les observations faites sous terre nous laissent penser que le r\u00e9seau est rapidement noy\u00e9 lors des hautesdiront davantage. Du mat\u00e9riel de mesure de d\u00e9bit est install\u00e9 sur le site afin de suivre l&rsquo;\u00e9volution des hauteurs d&rsquo;eau dans le lac. Les fortes pr\u00e9cipitations de la fin ao\u00fbt emp\u00eachant de franchir le lac depuis cette date.<\/p>\n<p>2006 et 2007 seront plus laborieux, la d\u00e9sobstruction dans le m\u00e9andre terminal bien ventil\u00e9 au-dessus de l\u2019actif siphonnant est poursuivie ; escalades et rep\u00e9rage Arva sont effectu\u00e9s pour d\u00e9celer une entr\u00e9e qui nous permettrait de shunter la zone siphonnante. Les conditions m\u00e9t\u00e9o pas toujours rassurantes sont la cause d\u2019annulation de sortie. Nous en profiterons pour visiter les mines de Neyrac. Enfin, le 2 septembre 2007, l\u2019\u00e9troiture terminale est franchie et environ 300 m\u00e8tres de galerie sont parcourus. Sans suite \u00e9vidente ! Mais le courant d\u2019air est pr\u00e9sent\u2026 et un siphon reste \u00e0 plonger.<\/p>\n<p>Ce siphon sera plong\u00e9e par Jean Pierre BAUDU en juin 2009. En une explo 1 km de de nouvelles galeries est explor\u00e9.<\/p>\n<p style=\"text-align: center;\"><em>Parfois, c&rsquo;est sympa !<\/em><\/p>\n<p><a href=\"\/wp-content\/uploads\/galerie\/p7294446.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-259\" title=\"p7294446\" src=\"\/wp-content\/uploads\/galerie\/p7294446.jpg\" alt=\"\" width=\"499\" height=\"375\" srcset=\"https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p7294446.jpg 829w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p7294446-300x225.jpg 300w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p7294446-768x576.jpg 768w\" sizes=\"(max-width: 499px) 100vw, 499px\" \/><\/a><\/p>\n<p style=\"text-align: center;\">\n<p style=\"text-align: center;\"><em>Il y a des jours o\u00f9 la vie est belle&#8230;<\/em><\/p>\n<p style=\"text-align: justify;\"><a href=\"\/wp-content\/uploads\/galerie\/p1010927.jpg\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-260\" title=\"p1010927\" src=\"\/wp-content\/uploads\/galerie\/p1010927.jpg\" alt=\"\" width=\"500\" height=\"354\" srcset=\"https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p1010927.jpg 972w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p1010927-300x213.jpg 300w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/p1010927-768x544.jpg 768w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">\n<p style=\"text-align: justify;\">En juillet 2008, la perte de la Sagnette est d\u00e9sobstru\u00e9e\u2026 Cette perte s\u2019ouvre \u00e0 1120 m d\u2019altitude, au contact des schistes et calcaire, et \u00e0 environ 700 m de la grotte de Pr\u00e9 de Neyrac pour 120 m de d\u00e9nivel\u00e9. Les explorations 2009 laissent pr\u00e9sager une suite besogneuse&#8230;<\/p>\n<p style=\"text-align: justify;\"><a href=\"\/wp-content\/uploads\/galerie\/logo-tritons.bmp\"><img decoding=\"async\" width=\"156\" height=\"166\" class=\"alignright size-thumbnail wp-image-206\" title=\"logo-tritons\" src=\"\/wp-content\/uploads\/galerie\/logo-tritons.bmp\" alt=\"\" \/><\/a><\/p>\n<p style=\"text-align: center;\">\n<p style=\"text-align: center;\"><a href=\"http:\/\/cesame.ardeche.free.fr\/\" target=\"_blank\"><img decoding=\"async\" class=\"alignleft size-thumbnail wp-image-238\" title=\"CESAME\" src=\"\/wp-content\/uploads\/galerie\/cesame-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/cesame-150x150.jpg 150w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/cesame-300x300.jpg 300w, https:\/\/clandestritons.fr\/wp-content\/uploads\/galerie\/cesame.jpg 451w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><span style=\"text-decoration: underline;\"><strong>Explorations en cours <\/strong><\/span><\/p>\n<p style=\"text-align: center;\"><strong>Clan des Tritons \u2013 Lyon (Rh\u00f4ne) <\/strong><\/p>\n<p style=\"text-align: center;\"><strong>CESAME (Loire)<\/strong><\/p>\n<p style=\"text-align: center;\">\n<p style=\"text-align: center;\">\n<p style=\"text-align: center;\">\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\">\n<p style=\"text-align: left;\"><strong><span style=\"text-decoration: underline;\">Archives<\/span><br \/>\n<\/strong><\/p>\n<ul>\n<li><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2005_03.zip\">pre-de-neyrac-2005_03<\/a> (Fichier .kmz , \u00e0 ouvrir avec google earth)<\/li>\n<li><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2005_03-ind-c-topographie-toporobot.pdf\">pre-de-neyrac-2005_03-ind-c-topographie-toporobot<\/a> (fichier .pdf)<\/li>\n<li><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2005_03-ind-c-report-en-surface.pdf\">pre-de-neyrac-2005_03-ind-c-repor<\/a><a href=\"\/wp-content\/uploads\/galerie\/pre-de-neyrac-2005_03-ind-c-report-en-surface.pdf\">t-en-surface<\/a> (fichier .pdf)<\/li>\n<\/ul>\n<div class=\"mceTemp\"><a><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>d&rsquo;apr\u00e8s Jean Philippe GRANDCOLAS, avec la collaboration de Christophe TSCHERTER (photos) et Alexandre PONT. Documents \u00e0 t\u00e9l\u00e9charger (Mise \u00e0 jour 03\/2018) : pre-de-neyrac-2009_02-ind-d-topographie-toporobot (fichier .pdf) pre-de-neyrac-2009_02-ind-d-report-en-surface (fichier .pdf) compte-rendu-de-la-radiolocalisation-a-la-grotte-du-pre-de-neyrac-27-juin-2009 par Daniel Chailloux &#8211; AREMIS \u2013 CDS94 (fichier .pdf) grotte-du-pre-de-neyrac-2009_02 (Fichier .kmz , \u00e0 ouvrir avec google earth) article Sp\u00e9l\u00e9o Dossier n\u00b0 38 (2013) par JPG [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","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":""}},"footnotes":""},"categories":[8,35],"tags":[90,68,91],"class_list":["post-236","post","type-post","status-publish","format-standard","hentry","category-actu","category-environnement","tag-grotte-de-pre-de-neyrac","tag-speleo","tag-tritons"],"_links":{"self":[{"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/posts\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=236"}],"version-history":[{"count":31,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/posts\/236\/revisions"}],"predecessor-version":[{"id":2035,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=\/wp\/v2\/posts\/236\/revisions\/2035"}],"wp:attachment":[{"href":"https:\/\/clandestritons.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clandestritons.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}