{"id":2994,"date":"2026-07-10T19:22:43","date_gmt":"2026-07-10T19:22:43","guid":{"rendered":"https:\/\/swissdaily.ch\/secheresse-suisse\/"},"modified":"2026-07-10T19:22:43","modified_gmt":"2026-07-10T19:22:43","slug":"secheresse-suisse","status":"publish","type":"post","link":"https:\/\/swissdaily.ch\/de\/secheresse-suisse\/","title":{"rendered":"La Suisse face \u00e0 une s\u00e9cheresse historique : donn\u00e9es, impacts et perspectives hydrologiques"},"content":{"rendered":"<p>Le lac de Constance affiche en ce moment le niveau le plus bas jamais mesur\u00e9 pour cette p\u00e9riode de l&rsquo;ann\u00e9e. Ce chiffre, \u00e0 lui seul, r\u00e9sume l&rsquo;ampleur d&rsquo;une situation hydrologique qui d\u00e9passe le cadre d&rsquo;un simple \u00e9pisode estival sec : la Suisse traverse l&rsquo;une des s\u00e9cheresses les plus s\u00e9v\u00e8res depuis le d\u00e9but des relev\u00e9s m\u00e9t\u00e9orologiques syst\u00e9matiques.<\/p>\n<\/p>\n<p>Apr\u00e8s un printemps exceptionnellement d\u00e9ficitaire en pr\u00e9cipitations, les orages ponctuels des derni\u00e8res semaines n&rsquo;ont apport\u00e9 qu&rsquo;un soulagement localis\u00e9 et de courte dur\u00e9e. Selon la <strong>Plateforme nationale sur la s\u00e9cheresse<\/strong> de la Conf\u00e9d\u00e9ration, le manque d&rsquo;eau touche d\u00e9sormais l&rsquo;ensemble du territoire suisse, du Plateau central au Valais en passant par le Jura. M\u00e9t\u00e9oSuisse ne pr\u00e9voit aucun changement durable des conditions atmosph\u00e9riques \u00e0 court terme : quelques orages isol\u00e9s restent possibles, mais aucune p\u00e9riode prolong\u00e9e de pr\u00e9cipitations g\u00e9n\u00e9ralis\u00e9es ne se dessine \u00e0 l&rsquo;horizon.<\/p>\n<\/p>\n<p>Les donn\u00e9es de pr\u00e9cipitations illustrent concr\u00e8tement l&rsquo;\u00e9tendue du d\u00e9ficit. Sur les quatre-vingt-dix derniers jours, certaines r\u00e9gions situ\u00e9es au nord des Alpes et en Valais ont enregistr\u00e9 jusqu&rsquo;\u00e0 61 % de pluie en moins par rapport \u00e0 la moyenne historique. Le d\u00e9ficit des trente derniers jours demeure lui aussi significatif dans une grande partie du pays. Or, les orages, m\u00eame intenses, ne constituent pas une r\u00e9ponse structurelle \u00e0 ce type de d\u00e9ficit : leur port\u00e9e g\u00e9ographique reste trop limit\u00e9e et leur dur\u00e9e trop br\u00e8ve pour permettre une r\u00e9humidification profonde des sols. Quirin Beck, m\u00e9t\u00e9orologue chez blue News, le soulignait d\u00e8s le mois de mai : c&rsquo;est la quantit\u00e9 totale de pluie accumul\u00e9e sur plusieurs semaines qui d\u00e9termine la reconstitution des r\u00e9serves hydriques, non l&rsquo;intensit\u00e9 d&rsquo;un \u00e9pisode isol\u00e9. Pour que les nappes phr\u00e9atiques, les sols et les cours d&rsquo;eau retrouvent un niveau satisfaisant, la Conf\u00e9d\u00e9ration estime qu&rsquo;il faudrait plusieurs semaines de pluies mod\u00e9r\u00e9es et r\u00e9guli\u00e8res \u2014 un sc\u00e9nario que les mod\u00e8les m\u00e9t\u00e9orologiques actuels n&rsquo;anticipent pas.<\/p>\n<\/p>\n<p>Les effets sur le r\u00e9seau hydrographique sont d\u00e9j\u00e0 mesurables. De nombreuses rivi\u00e8res affichent des d\u00e9bits nettement inf\u00e9rieurs aux normales saisonni\u00e8res, notamment dans le Jura et sur le Plateau occidental. Le lac de Walenstadt et le lac de Zoug pr\u00e9sentent \u00e9galement des niveaux inhabituellement bas. Dans les Alpes, la fonte des neiges s&rsquo;est achev\u00e9e plus t\u00f4t que d&rsquo;ordinaire, privant les cours d&rsquo;eau d&rsquo;un apport compl\u00e9mentaire qui compense habituellement les d\u00e9ficits pluviom\u00e9triques estivaux. Les nappes phr\u00e9atiques superficielles, particuli\u00e8rement r\u00e9actives aux variations de recharge, accusent d\u00e9j\u00e0 des niveaux sensiblement inf\u00e9rieurs \u00e0 la normale dans de nombreuses r\u00e9gions.<\/p>\n<\/p>\n<p>Sur le plan agricole, la pression s&rsquo;exerce depuis plusieurs mois. Les cultures de ma\u00efs, de betteraves sucri\u00e8res et les prairies nouvellement ensemenc\u00e9es souffrent d&rsquo;un d\u00e9ficit d&rsquo;humidit\u00e9 qui ralentit la germination et r\u00e9duit les rendements. Les p\u00e2turages produisent moins de fourrage, ce qui contraint les exploitations d&rsquo;\u00e9levage \u00e0 anticiper leurs besoins en alimentation compl\u00e9mentaire. La <strong>Plateforme nationale sur la s\u00e9cheresse<\/strong> signale qu&rsquo;une grande partie du territoire pr\u00e9sente d\u00e9sormais un d\u00e9ficit d&rsquo;humidit\u00e9 des sols qualifi\u00e9 d&rsquo;important \u00e0 tr\u00e8s important, rendant l&rsquo;irrigation indispensable dans de nombreuses exploitations. Plusieurs communes ont d&rsquo;ores et d\u00e9j\u00e0 instaur\u00e9 des restrictions sur les pr\u00e9l\u00e8vements d&rsquo;eau ou lanc\u00e9 des appels formels \u00e0 l&rsquo;\u00e9conomie de la ressource.<\/p>\n<\/p>\n<p>Du c\u00f4t\u00e9 de l&rsquo;approvisionnement en eau potable, la situation reste pour l&rsquo;instant ma\u00eetris\u00e9e \u00e0 l&rsquo;\u00e9chelle nationale. L&rsquo;<strong>Office f\u00e9d\u00e9ral de l&rsquo;environnement (OFEV)<\/strong> pr\u00e9cise cependant que les petits r\u00e9seaux d&rsquo;alimentation locaux pourraient se retrouver sous pression si la s\u00e9cheresse se prolonge. Les cantons et communes disposent de la comp\u00e9tence \u2014 relevant de la <strong>Kantonssouvr\u00e4nit\u00e4t<\/strong> en mati\u00e8re de gestion des ressources naturelles \u2014 pour d\u00e9cider d&rsquo;interdire ou de limiter les pr\u00e9l\u00e8vements selon les conditions locales. Parall\u00e8lement, le risque d&rsquo;incendie de for\u00eat s&rsquo;accro\u00eet \u00e0 mesure que les sols se dess\u00e8chent, et plusieurs r\u00e9gions ont d\u00e9j\u00e0 rehauss\u00e9 leur niveau d&rsquo;alerte.<\/p>\n<\/p>\n<p>La Conf\u00e9d\u00e9ration maintient une surveillance continue des niveaux d&rsquo;eau, de l&rsquo;humidit\u00e9 des sols, des nappes phr\u00e9atiques et du danger d&rsquo;incendie. L&rsquo;OFEV anticipe une aggravation de la situation de basses eaux dans un premier temps, les pr\u00e9visions m\u00e9t\u00e9orologiques faisant \u00e9tat d&rsquo;une nouvelle hausse des temp\u00e9ratures sans \u00e9pisode pluvieux durable. La <strong>Plateforme nationale sur la s\u00e9cheresse<\/strong> s&rsquo;attend \u00e0 une poursuite de la baisse de l&rsquo;humidit\u00e9 des sols et du d\u00e9bit de nombreux cours d&rsquo;eau.<\/p>\n<\/p>\n<p>Tout repose d\u00e9sormais sur la dur\u00e9e et l&rsquo;intensit\u00e9 des pr\u00e9cipitations \u00e0 venir. Sans plusieurs semaines de pluies abondantes et r\u00e9guli\u00e8res, le d\u00e9ficit hydrique accumul\u00e9 depuis le printemps ne pourra \u00eatre r\u00e9sorb\u00e9 avant l&rsquo;automne \u2014 et les donn\u00e9es disponibles ne permettent pas, \u00e0 ce stade, d&rsquo;anticiper ce retournement.<\/p>","protected":false},"excerpt":{"rendered":"<p>Le lac de Constance affiche en ce moment le niveau le plus bas jamais mesur\u00e9 pour cette p\u00e9riode de l&rsquo;ann\u00e9e. Ce chiffre, \u00e0 lui seul, r\u00e9sume l&rsquo;ampleur d&rsquo;une situation hydrologique qui d\u00e9passe le cadre d&rsquo;un simple \u00e9pisode estival sec : la Suisse traverse l&rsquo;une des s\u00e9cheresses les plus s\u00e9v\u00e8res depuis le d\u00e9but des relev\u00e9s m\u00e9t\u00e9orologiques [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2993,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,5],"tags":[],"class_list":["post-2994","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-suisse"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S\u00e9cheresse historique en Suisse : enjeux hydrologiques critiques<\/title>\n<meta name=\"description\" content=\"La Suisse face \u00e0 une s\u00e9cheresse sans pr\u00e9c\u00e9dent. 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