{"id":3101,"date":"2024-11-06T10:00:56","date_gmt":"2024-11-06T09:00:56","guid":{"rendered":"https:\/\/www.abyssa.com\/?p=3101"},"modified":"2024-11-06T15:09:07","modified_gmt":"2024-11-06T14:09:07","slug":"etudes-des-sources-hydrothermales-a-prony-les-resultats-de-la-campagne-abyssa-nc-et-island-robotics-enfin-disponibles","status":"publish","type":"post","link":"https:\/\/www.abyssa.com\/fr\/etudes-des-sources-hydrothermales-a-prony-les-resultats-de-la-campagne-abyssa-nc-et-island-robotics-enfin-disponibles\/","title":{"rendered":"\u00c9tudes des sources hydrothermales \u00e0 Prony : les r\u00e9sultats de la campagne Abyssa NC et Island Robotics enfin disponibles !"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column]<div id=\"ultimate-heading-224469f410685208d\" class=\"uvc-heading ult-adjust-bottom-margin ultimate-heading-224469f410685208d uvc-8718 \" data-hspacer=\"no_spacer\"  data-halign=\"left\" style=\"text-align:left\"><div class=\"uvc-heading-spacer no_spacer\" style=\"top\"><\/div><div class=\"uvc-main-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-224469f410685208d h2'  data-responsive-json-new='{\"font-size\":\"desktop:34px;\",\"line-height\":\"desktop:44px;\"}' ><h2 style=\"font-family:&#039;Exo 2&#039;;font-weight:200;margin-bottom:25px;\">Soutenu par l\u2019Agence Cal\u00e9donienne de l\u2019Energie et la DIMENC, notre projet a consist\u00e9 \u00e0 tester les capacit\u00e9s de deux types de robots sous-marins afin de caract\u00e9riser des sources hydrothermales susceptibles d\u2019\u00e9mettre en mer des flux d\u2019hydrog\u00e8ne naturel.<\/h2><\/div><div class=\"uvc-sub-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-224469f410685208d .uvc-sub-heading '  data-responsive-json-new='{\"font-size\":\"desktop:18px;\",\"line-height\":\"desktop:28px;\"}'  style=\"font-family:&#039;Exo 2&#039;;font-weight:300;margin-bottom:35px;\">Island Robotics et ABYSSA NC sont deux startups cal\u00e9doniennes qui d\u00e9veloppent des explorations sous-marines \u00e0 l\u2019aide de robots autonomes ou t\u00e9l\u00e9guid\u00e9s.<\/p>\n<p>Leur objet est de dresser des inventaires des patrimoines sous-marins, qu\u2019ils soient naturels ou artificiels<\/p>\n<p>Ces deux startups sont tr\u00e8s compl\u00e9mentaires, op\u00e9rant de m\u00eames technologies : Island Robotics des outils \u00ab petits fonds \u00bb et ABYSSA des outils \u00ab grands fonds \u00bb, jusqu\u2019\u00e0 6000 m\u00e8tres.<\/p>\n<p>La Grande Terre de Nouvelle-Cal\u00e9donie est une anomalie g\u00e9ologique constitu\u00e9e en partie par des roches du manteau terrestre revenues \u00e0 la surface.<\/p>\n<p>Celles-ci sont constitu\u00e9es majoritairement de p\u00e9ridotites qui ont la propri\u00e9t\u00e9, sous l\u2019effet de l\u2019eau &#8211; de pluie ou de mer &#8211; d\u2019\u00eatre \u00e0 l\u2019origine d\u2019un ph\u00e9nom\u00e8ne de serpentinisation qui pi\u00e8ge du CO2 et \u00e9met de l\u2019hydrog\u00e8ne naturel.<\/p>\n<p>Dans le sud de la Grande Terre, la Baie de Prony est un site unique au monde o\u00f9 se d\u00e9veloppe ce ph\u00e9nom\u00e8ne, avec des sources hydrothermales \u00e0 terre et par petits fonds.<\/p>\n<p>Les p\u00e9ridotites se poursuivent en mer jusqu\u2019\u00e0 plus de 2.000 m\u00e8tres et on consid\u00e8re qu\u2019elles pourraient \u00eatre les sites de sources d\u2019hydrog\u00e8ne profond.<\/div><\/div>[vc_raw_html css=\u00a0\u00bb\u00a0\u00bb]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[\/vc_raw_html]<div id=\"ultimate-heading-286869f4106852177\" class=\"uvc-heading ult-adjust-bottom-margin ultimate-heading-286869f4106852177 uvc-1695 \" data-hspacer=\"no_spacer\"  data-halign=\"left\" style=\"text-align:left\"><div class=\"uvc-heading-spacer no_spacer\" style=\"top\"><\/div><div class=\"uvc-main-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-286869f4106852177 h3'  data-responsive-json-new='{\"font-size\":\"desktop:28px;\",\"line-height\":\"desktop:38px;\"}' ><h3 style=\"font-family:&#039;Exo 2&#039;;font-weight:600;margin-bottom:25px;\">A Prony, les sources hydrothermales ont fait l\u2019objet de plusieurs \u00e9tudes oc\u00e9anographiques par le pass\u00e9.<\/h3><\/div><div class=\"uvc-sub-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-286869f4106852177 .uvc-sub-heading '  data-responsive-json-new='{\"font-size\":\"desktop:18px;\",\"line-height\":\"desktop:28px;\"}'  style=\"font-family:&#039;Exo 2&#039;;font-weight:300;margin-bottom:35px;\">Dans le d\u00e9but des ann\u00e9es 2000 une carte bathym\u00e9trique de r\u00e9solution d\u00e9cam\u00e9trique a mis en \u00e9vidence la pr\u00e9sence de 37 aiguilles hydrothermales sur les fonds de la Baie.<\/p>\n<p>Des \u00e9tudes compl\u00e9mentaires ont \u00e9galement prouv\u00e9 l\u2019existence de cet hydrothermalisme, la pr\u00e9sence d\u2019effluents ultrabasiques producteurs d\u2019aiguilles mais aussi de flux permanents, mais pas encore quantifi\u00e9s, d\u2019azote, d\u2019hydrog\u00e8ne et de m\u00e9thane. Il a aussi \u00e9t\u00e9 prouv\u00e9 la pr\u00e9sence d\u2019une biodiversit\u00e9 exceptionnelle, en particulier d\u2019une faune bact\u00e9rienne extr\u00eamophile et in\u00e9dite.<\/p>\n<p>Les outils utilis\u00e9s sont : un drone sous-marin autonome ou AUV \u00e9quip\u00e9 d\u2019un sonar lat\u00e9ral et de diff\u00e9rents capteurs ; un robot sous-marin t\u00e9l\u00e9guid\u00e9 ou ROV \u00e9quip\u00e9 d\u2019un capteur optique de tr\u00e8s haute r\u00e9solution et d\u2019un bras manipulateur pour de possibles pr\u00e9l\u00e8vements ; enfin nous disposons \u00e9galement d\u2019un sondeur multifaisceaux de tr\u00e8s haute r\u00e9solution.<\/p>\n<p>Grace \u00e0 ces outils d\u2019exploration des fonds, \u00e0 la fois non invasifs et de tr\u00e8s haute r\u00e9solution, nous avons men\u00e9 3 campagnes exploratoires entre novembre 2023 et septembre 2024.<\/p>\n<p>L\u2019objectif a \u00e9t\u00e9 d\u2019\u00e9valuer la capacit\u00e9 de ces outils \u00e0 caract\u00e9riser ces sources hydrothermales en petits fonds et d\u2019en tirer de possibles perspectives pour les grands fonds.<\/p>\n<p>Pour d\u00e9tecter ces possibles sources hydrothermales, nos outils utilisent diff\u00e9rents capteurs et instruments pouvant d\u00e9tecter les indices de leur pr\u00e9sence : sonar et bathym\u00e9trie, imagerie optique et autres capteurs\u2026<\/p>\n<p>S\u2019ajoute \u00e0 cela, la caract\u00e9risation de la biodiversit\u00e9 possiblement associ\u00e9e, gr\u00e2ce \u00e0 l\u2019imagerie haute r\u00e9solution d\u2019un ROV.<\/div><\/div><div id=\"ultimate-heading-853369f410685223f\" class=\"uvc-heading ult-adjust-bottom-margin ultimate-heading-853369f410685223f uvc-3175 \" data-hspacer=\"no_spacer\"  data-halign=\"left\" style=\"text-align:left\"><div class=\"uvc-heading-spacer no_spacer\" style=\"top\"><\/div><div class=\"uvc-main-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-853369f410685223f h3'  data-responsive-json-new='{\"font-size\":\"desktop:28px;\",\"line-height\":\"desktop:38px;\"}' ><h3 style=\"font-family:&#039;Exo 2&#039;;font-weight:600;margin-bottom:25px;\">Conform\u00e9ment aux pr\u00e9c\u00e9dentes \u00e9tudes, nous avons concentr\u00e9 nos recherches sur 3 zones de la Baie de Prony.<\/h3><\/div><div class=\"uvc-sub-heading ult-responsive\"  data-ultimate-target='.uvc-heading.ultimate-heading-853369f410685223f .uvc-sub-heading '  data-responsive-json-new='{\"font-size\":\"desktop:18px;\",\"line-height\":\"desktop:28px;\"}'  style=\"font-family:&#039;Exo 2&#039;;font-weight:300;margin-bottom:35px;\">Ces campagnes ont men\u00e9 \u00e0 des r\u00e9sultats probants parmi lesquels :<\/p>\n<ul>\n<li>l\u2019identification de 65 aiguilles hydrothermales de petites \u00e0 grandes dimension, contre 37 identifi\u00e9es par les m\u00e9thodes pr\u00e9c\u00e9dentes. Et cela gr\u00e2ce au sonar lat\u00e9ral.<\/li>\n<li>Une caract\u00e9risation tr\u00e8s pr\u00e9cise de ces aiguilles et de leur parties actives, ainsi qu\u2019une observation plus fine, avec une r\u00e9solution de l\u2019ordre de 20 \u00e0 50 cm, par rapport \u00e0 la bathym\u00e9trie d\u00e9cam\u00e9trique existante.<\/li>\n<li>Les cam\u00e9ras embarqu\u00e9es 4K d\u2019un ROV permettent d\u2019identifier et de d\u00e9crire pr\u00e9cis\u00e9ment la biodiversit\u00e9 associ\u00e9e \u00e0 ces sources, une alternative aux interventions humaines, en plong\u00e9e par 40 \u00e0 50 m\u00e8tres de profondeur, souvent dangereuses et limit\u00e9es dans le temps et l\u2019espace.<\/li>\n<li>Le sonar lat\u00e9ral a identifi\u00e9 sur le fond des trac\u00e9s de lignes d\u2019ancres des navires qui sont en attente devant le port de l\u2019Usine du Sud. L\u2019outil permet ainsi d\u2019\u00e9valuer le risque de voir un impact n\u00e9gatif de ces mouillages sur des aiguilles situ\u00e9es \u00e0 proximit\u00e9 et donc sur le patrimoine g\u00e9ologique et \u00e9cosyst\u00e9mique de la baie.\u2026<\/li>\n<li>Notons que de nombreuses aiguilles mortes sont rep\u00e9r\u00e9es au pied de plusieurs sites, de quoi attester d\u2019une \u00e9volution de cet \u00e9cosyst\u00e8me comme le montrent un certain nombre de mod\u00e9lisations 3D que nous avons pu r\u00e9aliser.<\/li>\n<li>Enfin ces campagnes nous ont permis d\u2019\u00e9tablir un ensemble de donn\u00e9es g\u00e9or\u00e9f\u00e9renc\u00e9es libres de droits et donc utilisables par la suite.<\/li>\n<\/ul>\n<p>Ainsi nous sommes en mesure d\u2019affirmer que gr\u00e2ce aux technologies utilis\u00e9es nous parvenons \u00e0 de meilleures connaissances, m\u00eame si de nombreuses r\u00e9ponses nous \u00e9chappent encore et qu\u2019une poursuite de nos investigations avec des capteurs compl\u00e9mentaires est tr\u00e8s hautement souhaitable.<\/div><\/div>[\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Soutenu par l\u2019Agence Cal\u00e9donienne de l\u2019Energie et la DIMENC, notre projet a consist\u00e9 \u00e0 tester les capacit\u00e9s de deux types de robots sous-marins afin de caract\u00e9riser des sources hydrothermales susceptibles d\u2019\u00e9mettre en mer des flux d\u2019hydrog\u00e8ne naturel.<\/p>\n","protected":false},"author":1,"featured_media":3105,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-3101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-abyssa","category-3","description-off"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - 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