{"id":90860,"date":"2025-01-16T17:19:15","date_gmt":"2025-01-16T10:19:15","guid":{"rendered":"https:\/\/www.forestsnews.org\/?p=90860"},"modified":"2025-09-08T11:18:33","modified_gmt":"2025-09-08T04:18:33","slug":"sur-le-passage-dun-cyclone-le-pouvoir-protecteur-des-mangroves-est-plus-determinant-que-jamais","status":"publish","type":"post","link":"https:\/\/www.forestsnews.org\/fr\/90860\/sur-le-passage-dun-cyclone-le-pouvoir-protecteur-des-mangroves-est-plus-determinant-que-jamais","title":{"rendered":"Sur le passage d\u2019un cyclone, le pouvoir protecteur des mangroves est plus d\u00e9terminant que jamais"},"content":{"rendered":"<h3><span style=\"color: #ff9900;\">\u00ab Lorsque je me pr\u00e9pare pour des recherches de terrain, je m\u2019attends \u00e0 des terrains difficiles, des conditions m\u00e9t\u00e9orologiques impr\u00e9visibles et des d\u00e9fis logistiques sans fin. Pourtant, rien ne m\u2019avait pr\u00e9par\u00e9 \u00e0 me retrouver sur la trajectoire d\u2019un cyclone, ni \u00e0 r\u00e9aliser \u00e0 quel point je d\u00e9pendrais des mangroves environnantes pour ma s\u00e9curit\u00e9 \u00bb .<\/span><\/h3>\n<p>En octobre 2024, j\u2019ai accompagn\u00e9 une \u00e9quipe de chercheurs du Centre de Recherche Foresti\u00e8re Internationale et du Centre International de Recherche en Agroforesterie (CIFOR-ICRAF), du Service Forestier des \u00c9tats-Unis (USFS) et des agents du d\u00e9partement des for\u00eats de l\u2019\u00c9tat d\u2019Odisha \u00e0 Bhitarkanika, la deuxi\u00e8me plus grande for\u00eat de mangroves deltaiques de l\u2019Inde apr\u00e8s les Sundarbans. Situ\u00e9e \u00e0 la confluence des rivi\u00e8res Brahmani et Baitarani dans l\u2019\u00c9tat d\u2019Odisha, cette r\u00e9gion exceptionnelle comprend le sanctuaire de faune de Bhitarkanika, le parc national et le sanctuaire de faune marine de Gahirmatha.<\/p>\n<p>Bhitarkanika constitue un habitat essentiel pour les crocodiles marins (<em>Crocodylus porosus<\/em>) et est potentiellement le plus grand site mondial de ponte massive pour la tortue oliv\u00e2tre (<em>Lepidochelys olivacea<\/em>), une esp\u00e8ce menac\u00e9e. Class\u00e9e site Ramsar en 2002, cette zone n\u2019est pas seulement un haut lieu de biodiversit\u00e9, mais aussi un rempart naturel vital, prot\u00e9geant les zones c\u00f4ti\u00e8res contre les temp\u00eates et l\u2019\u00e9rosion tout en offrant des b\u00e9n\u00e9fices \u00e9cologiques essentiels.<\/p>\n<p>Les travaux men\u00e9s \u00e0 Bhitarkanika s\u2019inscrivent dans une initiative plus large de surveillance de <a href=\"https:\/\/www.cifor-icraf.org\/mangrove-monitoring-india\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">la sant\u00e9 des mangroves \u00e0 travers toute l\u2019Inde<\/a>. Cela inclut des sites dans <a href=\"https:\/\/www.forestsnews.org\/87675\/crocodiles-tigers-rising-tides-fieldwork-in-the-largest-mangrove-forest-on-earth?fnl=\">la r\u00e9serve de biosph\u00e8re des Sundarbans<\/a> au Bengale-Occidental, <a href=\"https:\/\/india.mongabay.com\/2024\/10\/almost-20-years-after-the-tsunami-andamans-mangroves-are-still-changing\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">les \u00eeles Andaman et Nicobar<\/a>, ainsi que <a href=\"https:\/\/www.forestsnews.org\/89131\/india-on-ground-monitoring-set-to-shore-up-mangrove-resilience-in-coringa-wildlife-sanctuary?fnl=en\">le sanctuaire de faune de Coringa<\/a> en Andhra Pradesh. Ce projet national, fruit d\u2019une collaboration entre CIFOR-ICRAF, l\u2019USFS et les gouvernements des \u00c9tats, repose sur une m\u00e9thodologie syst\u00e9matique pour \u00e9valuer la r\u00e9silience des \u00e9cosyst\u00e8mes de mangroves en Inde.<\/p>\n<figure id=\"attachment_90863\" aria-describedby=\"caption-attachment-90863\" style=\"width: 450px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-90863\" src=\"https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1.webp\" alt=\"\" width=\"450\" height=\"600\" srcset=\"https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1.webp 450w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1-300x400.webp 300w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1-311x415.webp 311w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1-135x180.webp 135w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/2.-rSET-installation-scaled-1-335x446.webp 335w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-90863\" class=\"wp-caption-text\">L&rsquo;\u00e9quipe installe le rSET. Cr\u00e9dit photo : M. Sudip Debnath \/ Universit\u00e9 de Vidyasagar<\/figcaption><\/figure>\n<p>\u00c0 Bhitarkanika, notre mission consistait \u00e0 installer des tables d\u2019\u00e9l\u00e9vation de surface \u00e0 tige (rSET) et des enregistreurs automatiques de salinit\u00e9 et de profondeur de l\u2019eau. Ces dispositifs permettent de suivre les changements subtils mais significatifs dans la sant\u00e9 et la r\u00e9silience des mangroves au fil du temps, notamment les variations de l\u2019\u00e9l\u00e9vation du sol et des niveaux de salinit\u00e9. Cette surveillance \u00e0 long terme est essentielle pour comprendre comment les mangroves r\u00e9agissent aux pressions environnementales, en particulier celles induites par le changement climatique. Ces donn\u00e9es peuvent ensuite appuyer l\u2019\u00e9laboration de strat\u00e9gies de conservation et de gestion plus efficaces.<\/p>\n<p>Cependant, alors que nous commencions nos travaux de terrain, nous avons appris l\u2019arriv\u00e9e imminente du cyclone Dana, une temp\u00eate tropicale de cat\u00e9gorie 1. Nous avons suspendu nos activit\u00e9s pour assurer la s\u00e9curit\u00e9 de tous et nous nous sommes r\u00e9fugi\u00e9s dans une petite maison d\u2019h\u00f4tes \u00e0 Dangamala, Rajnagar, entour\u00e9e d\u2019\u00e9paisses for\u00eats de mangroves.<\/p>\n<p>Le 24 octobre, alors que le cyclone touchait terre et que les vents s\u2019intensifiaient, nous avons pleinement mesur\u00e9 la force et la r\u00e9silience des \u00ab murs \u00bb de mangroves qui nous entouraient et nous prot\u00e9geaient. En tant que scientifiques sp\u00e9cialis\u00e9s dans les mangroves, nous savions d\u00e9j\u00e0 que ces \u00e9cosyst\u00e8mes agissent comme des barri\u00e8res naturelles, absorbant et dissipant la force des vents et des vagues, et prot\u00e9geant les communaut\u00e9s proches en r\u00e9duisant l\u2019\u00e9nergie des cyclones.<\/p>\n<p>Cependant, lire sur ces bienfaits protecteurs et les vivre concr\u00e8tement sont deux exp\u00e9riences bien diff\u00e9rentes. Depuis l\u2019abri de la for\u00eat, nous pouvions entendre la violence de la temp\u00eate, rappel brutal des ravages que de telles temp\u00eates peuvent infliger aux c\u00f4tes non prot\u00e9g\u00e9es. Mais autour de nous, les mangroves absorbaient une grande partie de l\u2019impact, demeurant r\u00e9silientes face au cyclone.<\/p>\n<figure id=\"attachment_90865\" aria-describedby=\"caption-attachment-90865\" style=\"width: 1100px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-90865\" src=\"https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1.webp\" alt=\"\" width=\"1100\" height=\"508\" srcset=\"https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1.webp 1100w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-566x261.webp 566w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-832x384.webp 832w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-768x355.webp 768w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-220x102.webp 220w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-800x369.webp 800w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-610x282.webp 610w, https:\/\/www.forestsnews.org\/wp-content\/uploads\/2025\/01\/1.-Dana-crossing-scaled-1-672x310.webp 672w\" sizes=\"auto, (max-width: 1100px) 100vw, 1100px\" \/><figcaption id=\"caption-attachment-90865\" class=\"wp-caption-text\">Le passage du cyclone Dana. Cr\u00e9dit photo : Utchimahali Mariappan \/ CIFOR-ICRAF<\/figcaption><\/figure>\n<p>Cette exp\u00e9rience a donn\u00e9 un sens nouveau \u00e0 notre travail. En installant les rSET et les enregistreurs de donn\u00e9es, nous pouvons d\u00e9sormais documenter et quantifier les services protecteurs des mangroves, tels que les variations de l\u2019\u00e9l\u00e9vation du sol, les niveaux d\u2019eau et l\u2019impact des temp\u00eates. Savoir que nos donn\u00e9es mettront en lumi\u00e8re le r\u00f4le d\u00e9terminant des mangroves dans la protection des c\u00f4tes donne une v\u00e9ritable valeur \u00e0 nos efforts.<\/p>\n<p>Une fois le cyclone pass\u00e9, nous avons repris nos installations, profond\u00e9ment reconnaissants de la protection offerte par les mangroves de Bhitarkanika. Nos enregistreurs collectent d\u00e9sormais des donn\u00e9es sur la salinit\u00e9, la temp\u00e9rature et les niveaux d\u2019eau, fournissant des informations essentielles sur la r\u00e9silience de la for\u00eat face \u00e0 l\u2019\u00e9l\u00e9vation du niveau de la mer et aux temp\u00eates.<\/p>\n<div class='short-link'>\n\t\t\t<a class='GTMshortLink' href='https:\/\/www.cifor-icraf.org\/mangrove-monitoring-india\/' target='_blank'>\n\t\t\t\t<span class='short-link__box'><span>A LIRE EGALEMENT<\/span><\/span>\n\t\t\t\t<span class='short-link__desc'>Mangrove monitoring for climate change mitigation in India<\/span>\n\t\t\t<\/a>\n\t\t<\/div>\n<p>Les cyclones sont fr\u00e9quents dans le golfe du Bengale et affectent souvent gravement la r\u00e9serve de biosph\u00e8re des Sundarbans et le parc national de Bhitarkanika. Les mangroves continuent de prosp\u00e9rer malgr\u00e9 ces \u00e9v\u00e9nements climatiques extr\u00eames. Cependant, il est incertain de savoir combien de temps leur r\u00e9silience pourra r\u00e9sister face \u00e0 la mont\u00e9e du niveau de la mer, au stress environnemental et \u00e0 la fr\u00e9quence accrue des \u00e9v\u00e9nements m\u00e9t\u00e9orologiques extr\u00eames.<\/p>\n<p>Ainsi, \u00ab un ensemble de donn\u00e9es solide \u00e0 long terme et des mod\u00e8les sp\u00e9cifiques aux esp\u00e8ces sont n\u00e9cessaires pour comprendre les impacts du changement climatique mondial sur les mangroves \u00bb, a d\u00e9clar\u00e9 Sahadev Sharma, scientifique de l\u2019USFS et membre de l\u2019\u00e9quipe de terrain. \u00ab La conservation et la gestion des mangroves existantes sont essentielles, avec des actions de restauration et de r\u00e9habilitation bas\u00e9es sur des donn\u00e9es scientifiques. \u00bb<\/p>\n<p>\u00ab Une compr\u00e9hension plus approfondie de la r\u00e9ponse de ces syst\u00e8mes naturels aux pressions anthropiques et naturelles complexes est importante pour une meilleure prise de d\u00e9cision \u00bb, a ajout\u00e9 Rupesh Bhomia, scientifique du CIFOR-ICRAF en charge de la mise en place des sites de surveillance des mangroves \u00e0 long terme dans tout le pays.<\/p>\n<p>Cette mission de terrain a marqu\u00e9 un tournant dans ma carri\u00e8re, r\u00e9affirmant les raisons pour lesquelles j\u2019ai choisi ce domaine de recherche. Les mangroves sont bien plus que de simples v\u00e9g\u00e9taux c\u00f4tiers : elles sont des boucliers naturels contre les extr\u00eames climatiques, des protectrices de la biodiversit\u00e9 et des ressources pr\u00e9cieuses pour les communaut\u00e9s environnantes. Travailler \u00e0 Bhitarkanika pendant le cyclone Dana a renforc\u00e9 mon admiration pour ces \u00e9cosyst\u00e8mes et les innombrables vies qu\u2019ils prot\u00e8gent \u2014 humaines ou non.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00ab Lorsque je me pr\u00e9pare pour des recherches de terrain, je m\u2019attends \u00e0 des terrains difficiles, des conditions m\u00e9t\u00e9orologiques impr\u00e9visibles et des d\u00e9fis logistiques sans fin. Pourtant, rien ne m\u2019avait pr\u00e9par\u00e9 \u00e0 me retrouver sur la trajectoire d\u2019un cyclone, ni \u00e0 r\u00e9aliser \u00e0 quel point je d\u00e9pendrais des mangroves environnantes pour ma s\u00e9curit\u00e9 \u00bb . [&hellip;]<\/p>\n","protected":false},"author":475,"featured_media":90861,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[12040,12051,12056],"tags":[8787,1812],"language":[2170],"location":[12253,12281],"tag-bahasa":[],"tag-espanol":[],"tag-francais":[11859,2327],"type-espanol":[],"type-bahasa":[],"type-english":[],"type-francais":[2999],"coauthors":[11848],"class_list":["post-90860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-changement-climatique-et-energetique","category-gestion-et-restauration-forestiere","category-paysages","tag-cyclone","tag-mangrove","language-francais","location-asia-pacific","location-india","tag-francais-cyclone","tag-francais-mangroves","type-francais-analyses"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - 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