{"id":160152,"date":"2026-06-30T10:29:24","date_gmt":"2026-06-30T08:29:24","guid":{"rendered":"https:\/\/www.immo-invest.ch\/asphalt-hitze-kollaps-und-wer-die-rechnung-zahlt\/"},"modified":"2026-06-30T11:04:05","modified_gmt":"2026-06-30T09:04:05","slug":"asphalt-hitze-kollaps-und-wer-die-rechnung-zahlt","status":"publish","type":"post","link":"https:\/\/www.immo-invest.ch\/fr\/asphalt-hitze-kollaps-und-wer-die-rechnung-zahlt\/","title":{"rendered":"Asphalte, chaleur, effondrement\u2026 et qui paie la note ?"},"content":{"rendered":"<p>Les villes sont plus chaudes que leurs environs. Cet effet, connu sous le nom d\u2019\u00ab \u00eelot de chaleur urbain \u00bb, est d\u00fb aux sols imperm\u00e9abilis\u00e9s, aux toits sombres, aux masses de b\u00e9ton et \u00e0 la chaleur d\u00e9gag\u00e9e par la circulation et les climatiseurs. L\u2019eau de pluie s\u2019\u00e9coule imm\u00e9diatement dans les \u00e9gouts, au lieu de rafra\u00eechir l\u2019atmosph\u00e8re par \u00e9vaporation. Il en r\u00e9sulte des nuits tropicales.\u00a0 Des nuits durant lesquelles la temp\u00e9rature ne descend pas en dessous de 20 degr\u00e9s. Pour les personnes \u00e2g\u00e9es, les enfants et les personnes malades, cela repr\u00e9sente un danger permanent pour la sant\u00e9.<\/p>\n<p><strong>L\u2019h\u00e9ritage de la ville con\u00e7ue pour la voiture<br \/>\n<\/strong>Pendant des d\u00e9cennies, la mobilit\u00e9 a \u00e9t\u00e9 consid\u00e9r\u00e9e comme la priorit\u00e9 absolue en mati\u00e8re d\u2019urbanisme. Les routes ont \u00e9t\u00e9 \u00e9largies, des parkings am\u00e9nag\u00e9s, des arbres abattus. Ce qui fonctionnait dans le mod\u00e8le de circulation \u00e9choue lorsqu\u2019il fait 38 degr\u00e9s \u00e0 l\u2019ombre. Arbres d\u00e9plac\u00e9s, asphalte surchauff\u00e9, absence de circulation d\u2019air. Barcelone fait mieux. Avec ses \u00ab superblocs \u00bb, la ville a lib\u00e9r\u00e9 des p\u00e2t\u00e9s de maisons de la circulation de transit et gagn\u00e9 d\u2019immenses espaces pour les arbres, l\u2019ombre et l\u2019\u00e9vaporation naturelle.<\/p>\n<p><strong>Une ville-\u00e9ponge plut\u00f4t qu\u2019un r\u00e9seau d\u2019assainissement<br \/>\n<\/strong>Le principe de la ville-\u00e9ponge renverse l\u2019ancienne logique d\u2019urbanisme. Il ne s\u2019agit pas d\u2019\u00e9vacuer les eaux de pluie, mais de les stocker, de les laisser s\u2019infiltrer et de les utiliser comme agent rafra\u00eechissant en cas de forte chaleur. Des cuvettes v\u00e9g\u00e9talis\u00e9es, des sols nus et des r\u00e9servoirs souterrains lib\u00e8rent progressivement l\u2019humidit\u00e9 en cas de chaleur extr\u00eame. Medell\u00edn a transform\u00e9 des rues tr\u00e8s fr\u00e9quent\u00e9es en couloirs verts et a ainsi r\u00e9duit l\u2019effet d\u2019\u00eelot de chaleur d\u2019environ 2 degr\u00e9s Celsius, selon le r\u00e9seau de villes C40. Paris exploite un r\u00e9seau de plus de 1 400 espaces publics rafra\u00eechissants et un r\u00e9seau souterrain de refroidissement urbain. La lutte contre la chaleur y est consid\u00e9r\u00e9e comme une mission de service public.<\/p>\n<p><strong>Les arbres sont des infrastructures, pas de simples \u00e9l\u00e9ments d\u00e9coratifs<br \/>\n<\/strong>Un vieil arbre \u00e0 feuilles caduques rafra\u00eechit davantage que n\u2019importe quelle mesure technique. Pourtant, entre 2018 et 2025, plus de 900 000 arbres ont disparu dans 195 villes allemandes, selon le \u00ab Hitze-Check 2026 \u00bb de l\u2019association Deutsche Umwelthilfe. Un jeune arbre de remplacement met des d\u00e9cennies avant de produire le m\u00eame effet rafra\u00eechissant qu\u2019un vieil arbre abattu. Si l\u2019on veut des arbres urbains durables, il faut penser d\u00e8s le d\u00e9part \u00e0 l\u2019espace racinaire, \u00e0 l\u2019approvisionnement en eau et \u00e0 la protection contre le compactage du sol, et non a posteriori.<\/p>\n<p><strong>La lutte pour l\u2019espace<br \/>\n<\/strong>Les connaissances n\u00e9cessaires pour mettre en \u0153uvre les mesures ad\u00e9quates existent. Le probl\u00e8me est d\u2019ordre politique. Chaque cuvette d\u2019infiltration, chaque arbre, chaque bande d\u2019ombre a besoin d\u2019espace. L\u00e0 o\u00f9 r\u00e8gnent aujourd\u2019hui les places de stationnement et les voies de circulation, l\u2019adaptation au changement climatique devient source de conflit. Singapour r\u00e9sout ce probl\u00e8me gr\u00e2ce \u00e0 un syst\u00e8me centralis\u00e9 de refroidissement des quartiers. Le froid est produit et distribu\u00e9 de mani\u00e8re centralis\u00e9e, au lieu que chaque appartement utilise son propre climatiseur gourmand en \u00e9lectricit\u00e9. La protection contre la chaleur n\u2019est plus une question de confort. C\u2019est la condition fondamentale pour des villes habitables au XXIe si\u00e8cle.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fin juin 2026, la barre des 40 degr\u00e9s a \u00e9t\u00e9 franchie pour la premi\u00e8re fois en Allemagne au mois de juin. \u00c0 M\u00f6ckern-Drewitz, en Saxe-Anhalt, le thermom\u00e8tre a affich\u00e9 41,5 degr\u00e9s Celsius, un nouveau record historique. Ce n\u2019est pas un cas isol\u00e9. C\u2019est la cons\u00e9quence de d\u00e9cennies d\u2019urbanisme mal con\u00e7u.<\/p>\n","protected":false},"author":2,"featured_media":160153,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[22699,56006,22703,56027],"tags":[60043,872,3931,44617,2002,5141,11995,60044,60045],"class_list":["post-160152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-durabilite","category-international","category-mobilite","category-planification-developpement","tag-hitzeinseln","tag-immoinvest-fr","tag-immonews-fr","tag-klimaanpassung-fr","tag-news-fr","tag-schwammstadt-fr","tag-stadtplanung-fr","tag-urban-heat-island","tag-versiegelung"],"acf":{"bild_mit_ki_erstellt_worden":["Ja"],"lead":"Fin juin 2026, la barre des 40 degr\u00e9s a \u00e9t\u00e9 franchie pour la premi\u00e8re fois en Allemagne au mois de juin. \u00c0 M\u00f6ckern-Drewitz, en Saxe-Anhalt, le thermom\u00e8tre a affich\u00e9 41,5 degr\u00e9s Celsius, un nouveau record historique. Ce n\u2019est pas un cas isol\u00e9. C\u2019est la cons\u00e9quence de d\u00e9cennies d\u2019urbanisme mal con\u00e7u.","autor":"","ort":"","bildunterschrift":"","zusammenfassung":"","bild_im_grid":false,"gallerie":"","newsim":"3149"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Fin juin 2026, la barre des 40 degr\u00e9s a \u00e9t\u00e9 franchie pour la premi\u00e8re fois en Allemagne au mois de juin. \u00c0 M\u00f6ckern-Drewitz, en Saxe-Anhalt, le thermom\u00e8tre a affich\u00e9 41,5 degr\u00e9s Celsius, un nouveau record historique. Ce n\u2019est pas un cas isol\u00e9. 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