{"id":1307,"date":"2020-09-10T08:50:00","date_gmt":"2020-09-10T08:50:00","guid":{"rendered":"http:\/\/ostreisud.fr\/?p=1307"},"modified":"2021-03-17T17:48:23","modified_gmt":"2021-03-17T16:48:23","slug":"lhistoire-de-la-lagune-de-thau","status":"publish","type":"post","link":"https:\/\/ostreisud.fr\/?p=1307","title":{"rendered":"L’histoire de la lagune de Thau"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

L’\u00e9tang de Thau, la plus grande lagune c\u00f4ti\u00e8re m\u00e9diterran\u00e9enne d’Occitanie<\/h2>\n\n\n\n

La lagune de Thau, ou \u00e9tang de Thau (d\u2019apr\u00e8s l\u2019occitan estanh) fait partie d’une s\u00e9rie d’\u00e9tangs c\u00f4tiers m\u00e9diterran\u00e9en. Sa surface de 7500ha fait d’elle la plus grande lagune d’Occitanie.<\/p>\n\n\n\n

L’\u00e9tang de Thau se distingue par sa profondeur moyenne de 5m (contre moins de 2m pour les autres \u00e9tangs). Sur un tiers de sa superficie la profondeur d\u00e9passe dix m\u00e8tres. La fosse de la Vise, d’o\u00f9 est capt\u00e9 l’eau thermale de Balaruc les bains, atteint 32m de profondeur. <\/p>\n\n\n\n

La formation de la Lagune<\/h2>\n\n\n\n

Sa formation est le r\u00e9sultat du contre coup de la pouss\u00e9e des monts de la Gardiole, du mont Saint Claire de S\u00e8te et par la chaine des volcans venant du Massif Central se terminant au cap d\u2019Agde. Le plissement de la plaque continentale a form\u00e9 une vall\u00e9e en dessous du niveau de la mer.<\/p>\n\n\n\n

Il y a 10 000 ans \u00e0 la fin de l\u2019\u00e8re glaciaire la vall\u00e9e s’est retrouv\u00e9e sous le niveau de la mer et s’est remplit. Cependant la pr\u00e9sence des deux reliefs \u00e0 ses extr\u00e9mit\u00e9s a g\u00ean\u00e9e les mouvements de l’eau et surtout des s\u00e9diments. La mer, trop faible l\u2019\u00e9t\u00e9 face \u00e0 cet obstacle, a progressivement d\u00e9pos\u00e9 un banc de sable formant un banc de sable de 11km de long et 1 \u00e0 2 de large, le Lido. <\/p>\n\n\n\n

\"\"
Vue sur le lido. cr\u00e9dit photo: Christian Ferrer<\/strong><\/figcaption><\/figure>\n\n\n\n

Les scientifiques ne savent pas pr\u00e9cis\u00e9ment quand la lagune s’est ferm\u00e9e, mais des indices indirectes, comme la sp\u00e9ciation des hippocampes de la Lagune de Thau<\/a> semble indiquer que le ph\u00e9nom\u00e8ne est assez ancien, de l’ordre de 6000 ans. <\/p>\n\n\n\n

Les ouvertures vers la mer, les Grau<\/h2>\n\n\n\n

D\u2019apr\u00e8s les archives des passages ou Graus (Grau du Quinzi\u00e8me, Grau du Rieu, Grau de Pisse Saumes) aurait perdur\u00e9 jusqu\u2019au 17i\u00e8me<\/sup> si\u00e8cle et une partie du delta de l\u2019H\u00e9rault aurait transit\u00e9 par l\u2019\u00e9tang. <\/p>\n\n\n\n

Le Grau de Pisses Saumes fut le dernier \u00e0 disparaitre. D’abord \u00e9largi sous l’occupation pour stopper un \u00e9ventuelle charge de char d’assaut, il fut transform\u00e9 en canal des Allemands entre 1971 et 1973. <\/p>\n\n\n\n

Aujourd\u2019hui la lagune, o\u00f9 d\u00e9bouche le canal du midi et le canal du Rh\u00f4ne, est ouverte sur la mer via le canal royal \u00e0 S\u00e8te et le Grau de Marseillan.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’\u00e9tang de Thau, la plus grande lagune c\u00f4ti\u00e8re m\u00e9diterran\u00e9enne d’Occitanie La lagune de Thau, ou \u00e9tang de Thau (d\u2019apr\u00e8s l\u2019occitan estanh) fait partie d’une s\u00e9rie d’\u00e9tangs c\u00f4tiers m\u00e9diterran\u00e9en. Sa surface de 7500ha fait d’elle la plus grande lagune d’Occitanie. L’\u00e9tang de Thau se distingue par sa profondeur moyenne de 5m (contre moins de 2m pour […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"zakra_page_container_layout":"customizer","zakra_page_sidebar_layout":"customizer","zakra_remove_content_margin":false,"zakra_sidebar":"customizer","zakra_transparent_header":"customizer","zakra_logo":0,"zakra_main_header_style":"default","zakra_menu_item_color":"","zakra_menu_item_hover_color":"","zakra_menu_item_active_color":"","zakra_menu_active_style":"","zakra_page_header":true,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2,4],"tags":[],"class_list":["post-1307","post","type-post","status-publish","format-standard","hentry","category-blog","category-histoire-de-la-lagune-de-thau"],"acf":[],"yoast_head":"\nL'histoire de la lagune de Thau Ostr\u00e9isud<\/title>\n<meta name=\"description\" content=\"Comment s'est form\u00e9e l'\u00e9tang de Thau? 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