{"id":1818,"date":"2018-08-09T13:30:02","date_gmt":"2018-08-09T11:30:02","guid":{"rendered":"https:\/\/www.umweltperspektiven.ch\/?p=1818"},"modified":"2022-02-09T11:10:53","modified_gmt":"2022-02-09T10:10:53","slug":"gruene-staedte-senken-das-ueberflutungsrisiko","status":"publish","type":"post","link":"https:\/\/www.organisator.ch\/fr\/sustainability\/2018-08-09\/gruene-staedte-senken-das-ueberflutungsrisiko\/","title":{"rendered":"Les villes vertes r\u00e9duisent le risque d'inondation"},"content":{"rendered":"<figure id=\"attachment_1819\" aria-describedby=\"caption-attachment-1819\" style=\"width: 640px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1819\" src=\"\/\/www.umweltperspektiven.ch\/wp-content\/uploads\/2018\/08\/Gr\u00fcne-St\u00e4dte-senken-das-\u00dcberflutungsrisiko-up-umweltperspektiven.jpg\" alt=\"\" width=\"640\" height=\"424\" \/><figcaption id=\"caption-attachment-1819\" class=\"wp-caption-text\">A Berne, chaque habitant dispose d'un peu plus de 131 m\u00e8tres carr\u00e9s, \u00e0 Zurich de seulement 79 m\u00e8tres carr\u00e9s de verdure. (Source : Tagesanzeiger). (Image : zVg)<\/figcaption><\/figure>\n<p>Les villes vertes existent aussi en Suisse, voir la l\u00e9gende de la photo ci-dessus, mais dans de nombreuses grandes villes, les surfaces construites et imperm\u00e9abilis\u00e9es ne cessent d'augmenter en raison de la demande croissante de logements. \"De plus, les petits cours d'eau urbains, comme l'Aa \u00e0 M\u00fcnster (Rh\u00e9nanie-du-Nord-Westphalie), sont souvent confin\u00e9s dans des canalisations \u00e9troites et les espaces verts ou les zones d'\u00e9vitement en centre-ville font d\u00e9faut. Les canalisations ne peuvent pas contenir les pr\u00e9cipitations violentes et des crues urbaines soudaines se produisent\", explique le professeur Helmut Gr\u00fcning. \"Les cours d'eau ont besoin d'espace\", poursuit l'expert en technique de drainage du d\u00e9partement \u00c9nergie - B\u00e2timent - Environnement de l'Universit\u00e9 des sciences appliqu\u00e9es de M\u00fcnster.<\/p>\n<p><strong>\u00c9v\u00e9nements extr\u00eames<\/strong><\/p>\n<p>En moyenne, il tombe 800 mm de pr\u00e9cipitations par an dans notre pays. \"En principe, cela ne pose pas de probl\u00e8me si cela est r\u00e9parti sur l'ann\u00e9e. Au contraire, les conditions climatiques en Allemagne sont si bonnes que les probl\u00e8mes de manque d'eau sont un ph\u00e9nom\u00e8ne rare\". Normalement, deux tiers des pr\u00e9cipitations s'\u00e9vaporent et un tiers s'infiltre. L'objectif est de maintenir autant que possible cet \u00e9quilibre naturel de l'eau dans les zones urbaines, au lieu de rejeter les \u00e9coulements dans les \u00e9gouts.<\/p>\n<p>\"Les plantes jouent ici un r\u00f4le \u00e9norme. Elles sont garantes des processus d'\u00e9vaporation, car elles absorbent l'eau par les racines et l'\u00e9vaporent par les feuilles\". Ce faisant, elles produisent en m\u00eame temps du froid par \u00e9vaporation - un effet positif pour les chauds mois d'\u00e9t\u00e9. \"Nous ne pouvons rien faire de mieux que de v\u00e9g\u00e9taliser nos b\u00e2timents\". En effet, un toit vert ou une fa\u00e7ade de maison v\u00e9g\u00e9talis\u00e9e contribuent d\u00e9j\u00e0 \u00e0 cr\u00e9er des surfaces d'\u00e9vaporation. De plus, les plantes produisent de l'oxyg\u00e8ne, filtrent les poussi\u00e8res et les polluants atmosph\u00e9riques.<\/p>\n<p><strong>Ne pas rejeter l'eau de pluie dans les \u00e9gouts<\/strong><\/p>\n<p>\"Il est important pour moi de d\u00e9velopper des id\u00e9es qui r\u00e9pondent \u00e0 la probl\u00e9matique des fortes pluies et des inondations (voir aussi <a href=\"\/\/www.umweltperspektiven.ch\/abo-bestellung\/\">\"Une meilleure gestion des \u00e9pisodes de fortes pluies\", Perspectives environnementales 2018_04<\/a>).\" C'est pourquoi, selon lui, un bon concept, surtout dans les nouveaux quartiers, consiste \u00e0 \u00e9vacuer l'eau via des surfaces multifonctionnelles. Il peut s'agir de terrains de sport, de parcs, d'espaces verts ou encore d'aires de jeux pour enfants qui peuvent absorber temporairement l'eau. Les surfaces ouvertes, non imperm\u00e9abilis\u00e9es, prot\u00e8gent les constructions des cons\u00e9quences des risques climatiques, car l'eau de pluie peut s'infiltrer et \u00eatre restitu\u00e9e par une \u00e9vaporation contr\u00f4l\u00e9e.<\/p>\n<p>\"L'id\u00e9al serait de ne plus rejeter d'eau de pluie dans les \u00e9gouts, mais de la laisser s'infiltrer et s'\u00e9vaporer compl\u00e8tement\", explique Gr\u00fcning. Dans les structures urbaines d\u00e9velopp\u00e9es, cela ne sera toutefois possible que de mani\u00e8re limit\u00e9e. Mais Gr\u00fcning cherche \u00e9galement des opportunit\u00e9s de v\u00e9g\u00e9talisation urbaine dans les rues \u00e9troitement construites. C'est pourquoi il pr\u00e9voit un projet de recherche visant \u00e0 \u00e9tablir des arbres qui se contentent d'un espace minimal sans limiter les places de stationnement au bord de la route.<\/p>\n<p>\"Pour cela, il faut certes un syst\u00e8me d'irrigation sp\u00e9cial, car les plantes ont besoin d'eau pendant les phases de s\u00e9cheresse. Les arbres offrent de l'ombre, une fra\u00eecheur par \u00e9vaporation et assurent un \u00e9change d'air\".<\/p>\n<p>La v\u00e9g\u00e9talisation des villes pr\u00e9senterait de nombreux autres avantages, notamment en ce qui concerne les changements climatiques attendus. \"Toutefois, les urbanistes et les planificateurs des transports, mais aussi les politiciens et les propri\u00e9taires de maisons individuelles, doivent changer leur fa\u00e7on de penser afin de concevoir diff\u00e9remment les espaces urbains et de faire face au risque d'inondation\".<\/p>\n<p>Gauche :<\/p>\n<ul>\n<li><em>Prof. Dr Helmut Gr\u00fcning<\/em><br \/>\n<em><a href=\"\/\/www.fh-muenster.de\/fb4\/ueber-uns\/gruening\/gruening-helmut.php\">https:\/\/www.fh-muenster.de\/fb4\/ueber-uns\/gruening\/gruening-helmut.php<\/a><\/em><\/li>\n<li><em>Domaine \u00e9nergie - b\u00e2timent - environnement<\/em><br \/>\n<em><a href=\"\/\/www.fh-muenster.de\/egu\">www.fh-muenster.de\/egu<\/a><\/em><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Gr\u00fcne St\u00e4dte gibt es auch in der Schweiz, siehe obige Bildlegende, allerdings nehmen in vielen Grossst\u00e4dten die bebauten und versiegelten Fl\u00e4chen aufgrund der steigenden Nachfrage nach Wohnraum stetig zu. \u201eZudem sind kleine Stadtgew\u00e4sser, wie zum Beispiel die Aa in M\u00fcnster (Nordrhein Westfalen), h\u00e4ufig in engen Kan\u00e4len eingeschn\u00fcrt und innerst\u00e4dtische Gr\u00fcnfl\u00e4chen oder Ausweichfl\u00e4chen fehlen. Die Kanalisation [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":9564,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"Gr\u00fcne St\u00e4dte","_yoast_wpseo_metadesc":"Gibt es noch gr\u00fcne St\u00e4dte und was hat Hitze, Gewitter, Starkregen mit unserer Pflanzenwelt zu tun? Prof. Dr. Helmut Gr\u00fcning FH M\u00fcnster weiss Bescheid.","articlekey":"","footnotes":""},"categories":[580],"tags":[1472,1838,2183,2194,2456],"class_list":["post-1818","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sustainability","tag-kanalisation","tag-niederschlag","tag-stadtbegruenung","tag-starkregen","tag-verkehrsplanung"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gr\u00fcne St\u00e4dte senken das \u00dcberflutungsrisiko - Organisator<\/title>\n<meta name=\"description\" content=\"Gibt es noch gr\u00fcne St\u00e4dte und was hat Hitze, Gewitter, Starkregen mit unserer Pflanzenwelt zu tun? 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Le professeur Helmut Gr\u00fcning de l'Universit\u00e9 des sciences appliqu\u00e9es de M\u00fcnster en sait quelque chose.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.organisator.ch\/fr\/sustainability\/2018-08-09\/gruene-staedte-senken-das-ueberflutungsrisiko\/","og_locale":"fr_FR","og_type":"article","og_title":"Gr\u00fcne St\u00e4dte senken das \u00dcberflutungsrisiko - Organisator","og_description":"Gibt es noch gr\u00fcne St\u00e4dte und was hat Hitze, Gewitter, Starkregen mit unserer Pflanzenwelt zu tun? 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