{"id":12022,"date":"2023-06-19T17:46:08","date_gmt":"2023-06-19T15:46:08","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=12022"},"modified":"2023-06-20T08:57:20","modified_gmt":"2023-06-20T06:57:20","slug":"__trashed-2","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/","title":{"rendered":"R\u00e9duire l\u2019ilot de chaleur de l\u2019\u00e9cole des Blagis"},"content":{"rendered":"\n<p>Mercredi 7 juin, le conseil consultatif des transitions (CCT) a \u00e9t\u00e9 l\u2019occasion de pr\u00e9senter les travaux sur les<a href=\"https:\/\/www.notre-planete.info\/terre\/climatologie_meteo\/ilot-chaleur-urbain.php\" target=\"_blank\" rel=\"noreferrer noopener\"> ilots de chaleur<\/a> \u00e0 Sceaux. A la demande de la ville, une \u00e9tude a pr\u00e9cis\u00e9 la situation et pr\u00e9conis\u00e9 des solutions pratiques pour l\u2019am\u00e9liorer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le choix des Blagis<\/h2>\n\n\n\n<p>Plusieurs points au programme de ce CCT anim\u00e9 par Florence Presson et auquel assistaient une vingtaine de personnes. Le premier portait sur les<a href=\"https:\/\/lejournal.cnrs.fr\/articles\/comprendre-les-ilots-de-chaleur-urbains\" target=\"_blank\" rel=\"noreferrer noopener\"> ilots de chaleur,<\/a> un sujet qui a fait l\u2019objet de plusieurs r\u00e9unions de groupe de travail depuis un an.<\/p>\n\n\n\n<p>Plusieurs raisons ont pouss\u00e9 \u00e0 cibler la place des Ailantes, o\u00f9 se trouvent les \u00e9coles \u00e9l\u00e9mentaires et maternelles des Blagis<\/p>\n\n\n\n<p>D\u2019abord, la carte des ilots de chaleur montre une zone plus chaude en \u00e9t\u00e9 dans cette zone. Ensuite, une proposition citoyenne avait \u00e9t\u00e9 faite l\u2019an dernier, dans le cadre du budget participatif, pour une plus grande v\u00e9g\u00e9talisation.<\/p>\n\n\n\n<p>La ville a donc confi\u00e9 une mission \u00e0 un cabinet d\u2019\u00e9tudes, <a href=\"https:\/\/www.cereg.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">le CEREG<\/a>, avec trois objectifs. D\u2019abord \u00e9tudier la surchauffe urbaine sur le site des Blagis. Ensuite, proposer des pistes d\u2019am\u00e9nagement ambitieuses, pour baisser la temp\u00e9rature pour les \u00e9l\u00e8ves. Enfin, \u00e9valuer les gains attendus.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi des ilots de chaleur&nbsp;?<\/h2>\n\n\n\n<p>Les r\u00e9sultats ont \u00e9t\u00e9 pr\u00e9sent\u00e9s par un consultant du CEREG. Celui-ci a d\u2019abord pr\u00e9sent\u00e9 les cinq d\u00e9terminants des \u00e9missions de chaleur. D\u2019abord un facteur anthropique&nbsp;: les \u00e9missions de chaleur li\u00e9es \u00e0 l\u2019activit\u00e9 humaine et ses divers outils. \u00c9videmment, beaucoup plus importantes en milieu urbain dense qu\u2019\u00e0 la campagne.<\/p>\n\n\n\n<p>Ensuite deux param\u00e8tres morphologiques : les effets du vent (on parle de \u00ab&nbsp;rugosit\u00e9&nbsp;\u00bb) et ceux du pi\u00e9geage du rayonnement. Le premier renvoie au fait que la circulation de l\u2019air (qui apporte des masses plus fraiches) peut \u00eatre frein\u00e9e par diverses causes dont les constructions et leur hauteur. Le second est li\u00e9 au parcours des rayons solaires. S\u2019ils sont r\u00e9fl\u00e9chis par le sol ou une surface quelconque, ils se reportent-ils selon le cas vers l\u2019atmosph\u00e8re ou vers une autre surface, et encore une autre.<\/p>\n\n\n\n<p>Enfin, deux d\u00e9terminants&nbsp;surfaciques: la faible \u00e9vaporation et l\u2019absorption\/stockage de la chaleur. Ce sont les plus importants et surtout ceux sur lesquels il est possible d&rsquo;agir sur la place des Ailantes<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Caract\u00e9ristiques de la place<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-medium\"><img decoding=\"async\" width=\"300\" height=\"184\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant-300x184.jpg\" alt=\"\" class=\"wp-image-12045\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant-300x184.jpg 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant-768x471.jpg 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant.jpg 858w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure><\/div>\n\n\n<p>La zone \u00e9tudi\u00e9e comprend la place des Ailantes elle-m\u00eame et les b\u00e2timents autour, dont les deux \u00e9coles.<\/p>\n\n\n\n<p>Premier point, le taux d\u2019artificialisation. Ici, entre les b\u00e2timents et les sols b\u00e9tonn\u00e9s ou goudronn\u00e9s, il se situe \u00e0 87%. On le comprend, il existe un peu de v\u00e9g\u00e9tation, dont quelques arbres, mais en surface limit\u00e9e.<\/p>\n\n\n\n<p>L\u2019\u00e9tude a aussi fait ressortir un coefficient de biotope par surface (CBS) et un coefficient de ruissellement (CR). Ils \u00e9taient respectivement de 0,41 et de 0,85. On y reviendra.<\/p>\n\n\n\n<p>Les consultants ont \u00e9valu\u00e9 une dur\u00e9e d\u2019ensoleillement au sol moyenne, \u00e0 partir de l\u2019\u00e9valuation des dur\u00e9es d\u2019ensoleillement de chaque surface. Selon sa situation, chaque surface est expos\u00e9e plus ou moins longtemps au soleil. Les calculs sont faits ici pour le 30 juin, une p\u00e9riode o\u00f9 les journ\u00e9es sont particuli\u00e8rement longues. Les dur\u00e9es d\u2019exposition sont tr\u00e8s vari\u00e9es. On imagine la diff\u00e9rence entre une surface prot\u00e9g\u00e9e par un b\u00e2timent au sud et une autre dans un grand espace libre. Certaines &nbsp;surfaces peuvent \u00eatre prot\u00e9g\u00e9e par l\u2019ombre d\u2019un ou plusieurs b\u00e2timents et\/ou celle d\u2019un ou plusieurs arbres.<\/p>\n\n\n\n<p>La carte fait appara\u00eetre des zones o\u00f9 l\u2019ensoleillement dure entre 1 et 2 heures et d\u2019autres o\u00f9 il dure plus de 15 heures. Avec bien s\u00fbr les diff\u00e9rentes situations interm\u00e9diaires. La moyenne est \u00e9valu\u00e9e \u00e0 5h56.<\/p>\n\n\n\n<p>Les temp\u00e9ratures au sol ont \u00e9t\u00e9 aussi mesur\u00e9es, aboutissant \u00e0 une moyenne maximale de sol \u00e0 33,6\u00b0C. L\u00e0 aussi, cette moyenne recouvre des valeurs tr\u00e8s diff\u00e9rentes, entre moins de 20\u00b0C et plus de 50\u00b0C.<\/p>\n\n\n\n<p>On imagine que la dur\u00e9e d\u2019ensoleillement a un impact important sur ce r\u00e9sultat. Mais ce n\u2019est pas le seul&nbsp;: le type de mat\u00e9riau joue lui aussi un grand r\u00f4le. Le bitume est ainsi beaucoup plus chaud que le b\u00e9ton d\u00e9sactiv\u00e9 (\u00e0 l\u2019aspect gravillonn\u00e9).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les solutions propos\u00e9es<\/h2>\n\n\n\n<p>Le CEREG propose d\u2019agir dans deux directions&nbsp;: augmentation de la v\u00e9g\u00e9talisation et choix de rev\u00eatements qui chauffent moins.<\/p>\n\n\n\n<p>Dans le domaine de la v\u00e9g\u00e9talisation, la proposition vise des arbres dits de haute tige. Les esp\u00e8ces choisies devront \u00eatre r\u00e9sistantes au manque d\u2019eau et non allerg\u00e8nes. Quatre esp\u00e8ces ont \u00e9t\u00e9 propos\u00e9es, par exemple le tilleul \u00e0 petites feuilles ou l\u2019\u00e9rable plane.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-medium\"><img decoding=\"async\" width=\"300\" height=\"183\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-vision-20-ans-300x183.jpg\" alt=\"\" class=\"wp-image-12046\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-vision-20-ans-300x183.jpg 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-vision-20-ans-768x470.jpg 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-vision-20-ans.jpg 860w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure><\/div>\n\n\n<p>La dur\u00e9e de croissance de ces arbres a amen\u00e9 le CEREG a \u00e9valu\u00e9 les gains attendus \u00e0 5 ans et \u00e0 20 ans.<\/p>\n\n\n\n<p>Pour ce qui est des mat\u00e9riaux et du rev\u00eatement, outre les sols en herbe, sont \u00e9voqu\u00e9s les copeaux de bois et le b\u00e9ton clair drainant.<\/p>\n\n\n\n<p><strong>R\u00e9sultats attendus des am\u00e9nagements propos\u00e9s<\/strong><\/p>\n\n\n\n<p>Le CBS passerait de 0,41 \u00e0 0,47 (plus de v\u00e9g\u00e9tations) et le CR de 0,85 \u00e0 0,79 (les eaux sont mieux absorb\u00e9es).<\/p>\n\n\n\n<p>La dur\u00e9e moyenne d\u2019ensoleillement au sol en juin passerait de 5h56 \u00e0 4h49 au bout de 5 ans, puis 3h57 au bout de 20 ans.<\/p>\n\n\n\n<p>La temp\u00e9rature maximale au sol moyenne passerait de 33,6\u00b0C \u00e0 29,8\u00b0C au bout de 5 ans et 28,2\u00b0C au bout de 20 ans.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Et demain&nbsp;?<\/h2>\n\n\n\n<p>Philippe Szynkowski, conseiller municipal, a questionn\u00e9 Florence Presson sur l\u2019extension de ce type d\u2019\u00e9tudes \u00e0 d\u2019autres zones identifi\u00e9es comme ilots de chaleur. Cette derni\u00e8re a pr\u00e9cis\u00e9 qu\u2019on n\u2019en \u00e9tait pas l\u00e0 et qu\u2019il faut \u00eatre ouvert \u00e0 d\u2019autres id\u00e9es que les am\u00e9nagements propos\u00e9s. Le projet en cours a valeur d\u2019exp\u00e9rimentation et de prototype de sorte que les co\u00fbts n\u2019ont pas \u00e9t\u00e9 abord\u00e9s \u00e0 ce stade.<\/p>\n\n\n\n<p>Pour elle, si l\u2019\u00e9tude a d\u00e9gag\u00e9 des pistes d\u2019am\u00e9lioration int\u00e9ressantes, elle reste \u00e0 approfondir avant de penser extension. Elle n\u2019a pas identifi\u00e9 d\u2019\u00e9ch\u00e9ance pr\u00e9cise pour cela.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Limites de l\u2019\u00e9tude<\/h2>\n\n\n\n<p>L\u2019important gain de temp\u00e9rature attendu (plus de 5\u00b0 \u00e0 terme) concerne la temp\u00e9rature au sol, non la temp\u00e9rature ambiante. De mani\u00e8re compr\u00e9hensible, l\u2019\u00e9tude s\u2019est focalis\u00e9e sur les d\u00e9terminants observ\u00e9s comme les plus importants, ind\u00e9pendamment de ce qui se passe autour de la zone. On comprendra bien que la temp\u00e9rature ambiante d\u2019une zone aussi petite ne peut baisser \u00e0 ce point si elle ne bouge pas sur les zones voisines. On y reviendra.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mercredi 7 juin, le conseil consultatif des transitions (CCT) a \u00e9t\u00e9 l\u2019occasion de pr\u00e9senter les travaux sur les ilots de chaleur \u00e0 Sceaux. A la demande de la ville, une \u00e9tude a pr\u00e9cis\u00e9 la situation et pr\u00e9conis\u00e9 des solutions pratiques pour l\u2019am\u00e9liorer. Le choix des Blagis Plusieurs points au programme&#8230;<\/p>\n","protected":false},"author":11,"featured_media":12045,"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":[258,253,266],"tags":[],"class_list":["post-12022","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environnement","category-manifestations-locales","category-sceaux","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R\u00e9duire l\u2019ilot de chaleur de l\u2019\u00e9cole des Blagis - 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\/2023\/06\/19\/__trashed-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9duire l\u2019ilot de chaleur de l\u2019\u00e9cole des Blagis - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Mercredi 7 juin, le conseil consultatif des transitions (CCT) a \u00e9t\u00e9 l\u2019occasion de pr\u00e9senter les travaux sur les ilots de chaleur \u00e0 Sceaux. A la demande de la ville, une \u00e9tude a pr\u00e9cis\u00e9 la situation et pr\u00e9conis\u00e9 des solutions pratiques pour l\u2019am\u00e9liorer. Le choix des Blagis Plusieurs points au programme&#8230;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/\" \/>\n<meta property=\"og:site_name\" content=\"La Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-19T15:46:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-20T06:57:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"858\" \/>\n\t<meta property=\"og:image:height\" content=\"526\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"G\u00e9rard Bardier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"G\u00e9rard Bardier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/\"},\"author\":{\"name\":\"G\u00e9rard Bardier\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/#\/schema\/person\/5650e206a121f68c6f5e76379bccfbc4\"},\"headline\":\"R\u00e9duire l\u2019ilot de chaleur de l\u2019\u00e9cole des Blagis\",\"datePublished\":\"2023-06-19T15:46:08+00:00\",\"dateModified\":\"2023-06-20T06:57:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/\"},\"wordCount\":1148,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2023\/06\/Ilot-chaleur-Blagis-existant.jpg\",\"articleSection\":[\"Environnement\",\"Manifestations locales\",\"Sceaux\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/\",\"url\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2023\/06\/19\/__trashed-2\/\",\"name\":\"R\u00e9duire l\u2019ilot de chaleur de l\u2019\u00e9cole des Blagis - 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