{"id":8008,"date":"2022-11-14T08:37:42","date_gmt":"2022-11-14T07:37:42","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=8008"},"modified":"2022-11-14T08:37:43","modified_gmt":"2022-11-14T07:37:43","slug":"ilots-de-chaleur-et-forets","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/11\/14\/ilots-de-chaleur-et-forets\/","title":{"rendered":"\u00celots de chaleur et for\u00eats"},"content":{"rendered":"\n<p>Les deux articles pr\u00e9c\u00e9dents montraient <a rel=\"noreferrer noopener\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/11\/07\/sadapter-au-rechauffement-climatique-autour-du-parc-de-sceaux\/\" target=\"_blank\">la r\u00e9alit\u00e9 du r\u00e9chauffement climatique, nationalement<\/a>, puis sur le<a rel=\"noreferrer noopener\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/11\/08\/annee-chaude-autour-du-parc-de-sceaux\/\" target=\"_blank\"> territoire autour du parc de Sceaux<\/a>. Ceci rend indispensable de prendre des mesures d\u2019adaptation. Celles-ci peuvent \u00eatre tr\u00e8s diverses. Nous aborderons y celles des \u00eelots de chaleur, du patrimoine arboricole, de l\u2019isolation des logements. Dans chaque cas, nous examinerons la situation fran\u00e7aise et essaierons d\u2019en tirer des le\u00e7ons locales.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00celots de chaleur<\/h2>\n\n\n\n<p>Le <a>CEREMA<\/a>, \u00e9tablissement public sous la tutelle du minist\u00e8re de la Transition \u00e9cologique et de la Coh\u00e9sion des territoires, sch\u00e9matise ainsi le ph\u00e9nom\u00e8ne des \u00eelots de chaleur urbains (ICU):<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"287\" height=\"215\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Ilots-de-chaleur.png\" alt=\"\" class=\"wp-image-8013\"\/><\/figure><\/div>\n\n\n\n<p>Le CEREMA pointe ce qui provoque ce surcro\u00eet de chaleur dans les centres-villes&nbsp;:<\/p>\n\n\n\n<p>Le ph\u00e9nom\u00e8ne des ICU est li\u00e9 \u00e0 plusieurs facteurs :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Les propri\u00e9t\u00e9s thermophysiques des mat\u00e9riaux utilis\u00e9s pour la construction des b\u00e2timents, des voiries et autres infrastructures,<\/li><li>L\u2019occupation du sol (sols min\u00e9ralis\u00e9s, absence de v\u00e9g\u00e9tation),<\/li><li>La morphologie urbaine (voies de circulation importantes, \u00ab rugosit\u00e9 \u00bb urbaine diminuant la convection\u2026),<\/li><li>Le d\u00e9gagement de chaleur issu des activit\u00e9s humaines (moteurs, syst\u00e8mes de chauffage et de climatisation\u2026).<\/li><\/ul>\n\n\n\n<p>La capacit\u00e9 des humains \u00e0 r\u00e9cup\u00e9rer en p\u00e9riode de fortes chaleurs doit prendre en compte des contraintes.<\/p>\n\n\n\n<p>Les mat\u00e9riaux urbains stockent la chaleur (15 \u00e0 30% de plus que les zones moins denses) la journ\u00e9e qui se re-lib\u00e8re la nuit. Pour cette raison, le ph\u00e9nom\u00e8ne d\u2019ICU est plus marqu\u00e9 la nuit, emp\u00eachant les temp\u00e9ratures de redescendre.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-medium\"><img decoding=\"async\" width=\"300\" height=\"212\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-300x212.png\" alt=\"\" class=\"wp-image-8020\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-300x212.png 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-1024x724.png 1024w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-768x543.png 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-1536x1086.png 1536w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/E6-Carte-des-ilots-de-chaleur-et-de-fraicheur-urbains-Paris-2048x1448.png 2048w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure><\/div>\n\n\n\n<p>La diminution du ph\u00e9nom\u00e8ne suppose de diminuer localement ses causes avec deux grands moyens&nbsp;: augmenter le pouvoir r\u00e9fl\u00e9chissant des installations (par exemple en peignant les toits ou les routes en blanc), augmenter la part du v\u00e9g\u00e9talis\u00e9 dans la surface du sol. La partie v\u00e9g\u00e9talis\u00e9e comprend notamment les bois et for\u00eats.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nature.com\/articles\/s41467-021-26768-w\" target=\"_blank\" rel=\"noreferrer noopener\">Une \u00e9tude r\u00e9cente<\/a> \u00e0 partir de l\u2019 analyse des donn\u00e9es satellitaires de 293 villes d&rsquo;Europe montre que les arbres ont un effet rafra\u00eechissant, contrairement aux autres espaces verts,<a href=\"https:\/\/www.newscientist.com\/article\/2298675-trees-cool-the-land-surface-temperature-of-cities-by-up-to-12c\/\" target=\"_blank\" rel=\"noreferrer noopener\"> pouvant refroidir la temp\u00e9rature<\/a> de surface jusqu&rsquo;\u00e0 12\u00b0C. La carte des ilots de chaleur \u00e0 Paris illustre bien le ph\u00e9nom\u00e8ne : les bois de Boulogne et de Vincennes sont logiquement les zones les plus fraiches. Mais on voit aussi le r\u00f4le du fleuve ou du parc des Buttes Chaumont. Notons que sur cette carte(source : <a href=\"http:\/\/www.e6-consulting.fr\">www.e6-consulting.fr<\/a>), il y a 15\u00b0 de diff\u00e9rence entre les zones les plus fraiches et les plus chaudes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Bois et for\u00eats en France<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-medium\"><img decoding=\"async\" width=\"300\" height=\"276\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Surfaces-foresti\u00e8res-300x276.png\" alt=\"\" class=\"wp-image-8014\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Surfaces-foresti\u00e8res-300x276.png 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Surfaces-foresti\u00e8res.png 312w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure><\/div>\n\n\n\n<p>L\u2019<a href=\"https:\/\/www.ign.fr\/institut\">Institut national de l\u2019information g\u00e9ographique et foresti\u00e8re<\/a>(IGN) publie chaque ann\u00e9e un \u00ab\u00a0<a rel=\"noreferrer noopener\" href=\"https:\/\/inventaire-forestier.ign.fr\/IMG\/pdf\/memento_2022.pdf\" target=\"_blank\">inventaire forestier national<\/a>\u00a0\u00bb. Celui de 2022 prend en compte les ph\u00e9nom\u00e8nes observ\u00e9s en 2022, avec \u00ab\u00a0<em>la s\u00e9cheresse d\u00e9but\u00e9e au printemps, la canicule de l\u2019\u00e9t\u00e9 et les incendies qui ont d\u00e9truit plus de 70.000 hectares de for\u00eats en France m\u00e9tropolitaine<\/em>\u00a0\u00bb. Ses principales conclusions sont r\u00e9sum\u00e9es en d\u00e9but de publication\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>La surface de la for\u00eat augmente, atteignant 17,1 millions d\u2019hectares, soit + 21 % depuis 1985.<\/li><li>Le volume total de bois en for\u00eat s\u2019accro\u00eet \u00e9galement, atteignant 2,8 milliards de m\u00e8tres cubes. En effet, la production biologique \u00ab nette \u00bb, c\u2019est-\u00e0-dire la croissance des arbres, mortalit\u00e9 des arbres d\u00e9duite, est sup\u00e9rieure aux pr\u00e9l\u00e8vements.<\/li><li>Toutefois, encore \u00e0 hauteur de 5,3 m\u00b3 par hectare et par an il y a une d\u00e9cennie, cette production biologique \u00ab nette \u00bb est aujourd\u2019hui de 4,8 m\u00b3 par hectare et par an, ralentissant de 10 % environ.<\/li><li>Une augmentation significative de la mortalit\u00e9 des arbres. Ce flux annuel de la mortalit\u00e9, qui \u00e9quivaut \u00e0 0,4 % du volume de bois vivant, a augment\u00e9 de plus de 50 % entre les p\u00e9riodes 2005-2013 et 2012-2020.<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"269\" height=\"293\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Superficie-foresti\u00e8re-par-d\u00e9partement.png\" alt=\"\" class=\"wp-image-8015\"\/><\/figure><\/div>\n\n\n\n<p>L\u2019augmentation de la surface foresti\u00e8re apr\u00e8s des si\u00e8cles de d\u00e9forestation est la cons\u00e9quence de l\u2019augmentation de la productivit\u00e9 agricole \u00e0 l\u2019hectare et du remplacement du bois comme moyen de chauffage et de cuisson par les sources fossiles puis \u00e9lectriques.<\/p>\n\n\n\n<p>La surface des for\u00eats n\u2019est pas homog\u00e8ne en France. La r\u00e9gion parisienne est moins bois\u00e9e que la moyenne, mais elle poss\u00e8de malgr\u00e9 tout une superficie bois\u00e9e non n\u00e9gligeable.<\/p>\n\n\n\n<p>L\u2019inventaire note que la mortalit\u00e9 des arbres \u00e9tait sur les 5 derni\u00e8res ann\u00e9es en moyenne de 0,7 m\u00b3\/ha\/an. Soit en moyenne 0,4% du volume total de bois vivant sur pied et une augmentation de 54% par rapport \u00e0 la p\u00e9riode 2005\/2013. \u00ab&nbsp;<em>Cette hausse est notamment due aux crises sanitaires li\u00e9es \u00e0 des conditions climatiques \u00e0 la fois difficiles pour les arbres (s\u00e9cheresses) et propices aux insectes xylophages, notamment les scolytes<\/em>.&nbsp;\u00bb Elle n\u2019est pas homog\u00e8ne sur le territoire, comme le montre la carte ci-dessous.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"252\" height=\"288\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Mortalit\u00e9-foresti\u00e8re.png\" alt=\"\" class=\"wp-image-8016\"\/><\/figure><\/div>\n\n\n\n<p>On notera que le sud de la r\u00e9gion parisienne subit une mortalit\u00e9 foresti\u00e8re sup\u00e9rieure \u00e0 la moyenne. Cette surmortalit\u00e9 s&rsquo;explique par les esp\u00e8ces pr\u00e9sentes, la mortalit\u00e9 diff\u00e9rant de mani\u00e8re importante selon les esp\u00e8ces et leurs parasites sp\u00e9cifiques.<\/p>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/inventaire-forestier.ign.fr\/IMG\/pdf\/lif_sante-des-forets_web.pdf\" target=\"_blank\">Le num\u00e9ro 47 de l\u2019IF<\/a> (pour inventaire forestier) traite de la question de la sant\u00e9 des for\u00eats sous l\u2019angle de l\u2019analyse des donn\u00e9es sanitaires. On y apprend que les for\u00eats g\u00e9r\u00e9es sont en meilleur \u00e9tat sanitaire que celles qui ne le sont pas et que trois esp\u00e8ces sont particuli\u00e8rement attaqu\u00e9es&nbsp;: ch\u00e2taignier, fr\u00eane et \u00e9pic\u00e9a commun, le fr\u00eane \u00e9tant le plus en danger. Ce num\u00e9ro ne donne par contre pas d\u2019\u00e9l\u00e9ments sur les actions \u00e0 mener pour maintenir ou am\u00e9liorer la sant\u00e9 des arbres.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"440\" height=\"255\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Sant\u00e9-arbres-selon-esp\u00e8ce.png\" alt=\"\" class=\"wp-image-8017\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Sant\u00e9-arbres-selon-esp\u00e8ce.png 440w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/11\/Sant\u00e9-arbres-selon-esp\u00e8ce-300x174.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><\/figure>\n\n\n\n<p>Le r\u00f4le de la gestion publique est majeur dans la p\u00e9riode \u00e0 venir&nbsp;: s\u2019il est probable que la for\u00eat continue de grandir, le r\u00e9chauffement climatique facilite les crises sanitaires et contraint \u00e0 introduire des esp\u00e8ces adapt\u00e9es.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les deux articles pr\u00e9c\u00e9dents montraient la r\u00e9alit\u00e9 du r\u00e9chauffement climatique, nationalement, puis sur le territoire autour du parc de Sceaux. Ceci rend indispensable de prendre des mesures d\u2019adaptation. Celles-ci peuvent \u00eatre tr\u00e8s diverses. Nous aborderons y celles des \u00eelots de chaleur, du patrimoine arboricole, de l\u2019isolation des logements. Dans chaque&#8230;<\/p>\n","protected":false},"author":11,"featured_media":8013,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53,267,268,265,263,264,269],"tags":[],"class_list":["post-8008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","category-antony","category-bagneux","category-bourg-la-reine","category-chatenay-malabry","category-fontenay-aux-roses","category-le-plessis-robinson","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00celots de chaleur et for\u00eats - La Gazette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/11\/14\/ilots-de-chaleur-et-forets\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00celots de chaleur et for\u00eats - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Les deux articles pr\u00e9c\u00e9dents montraient la r\u00e9alit\u00e9 du r\u00e9chauffement climatique, nationalement, puis sur le territoire autour du parc de Sceaux. Ceci rend indispensable de prendre des mesures d\u2019adaptation. Celles-ci peuvent \u00eatre tr\u00e8s diverses. Nous aborderons y celles des \u00eelots de chaleur, du patrimoine arboricole, de l\u2019isolation des logements. 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