{"id":7331,"date":"2021-01-21T15:54:37","date_gmt":"2021-01-21T20:54:37","guid":{"rendered":"https:\/\/canarie.machinedev.ca\/rne\/case-studies\/risq\/"},"modified":"2023-09-21T08:19:22","modified_gmt":"2023-09-21T12:19:22","slug":"risq","status":"publish","type":"page","link":"https:\/\/www.canarie.ca\/fr\/rnre\/etudes-de-cas\/risq\/","title":{"rendered":"RISQ"},"content":{"rendered":"\n\n<section class=\"section section--text-with-image  alignfull container squares-right\">\n  <svg version=\"1.1\" class=\"animated-square-graphic\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\"\n\t viewBox=\"0 0 1084.85 1080\" style=\"enable-background:new 0 0 1084.85 1080;\" xml:space=\"preserve\">\n<style type=\"text\/css\">\n\t.st0{opacity:0.51;fill:#FEFEFE;}\n\t.st1{fill:#F4F4F5;}\n\t.st2{fill:#58C3D2;}\n\t.st3{fill:#E90D0B;}\n\t.st4{fill:#393D3F;}\n<\/style>\n<g>\n\t<path class=\"st0\" 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pr\u00e9cipitations au point de cong\u00e9lation<\/h1>\n  \t\t  \t\t                              <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n\n\n<p><strong>\u00c9tude de cas du RNRE par&nbsp;<a href=\"https:\/\/www.risq.quebec\/\" target=\"_blank\" rel=\"noreferrer noopener\">RISQ<\/a><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Une m\u00e9t\u00e9o hivernale impr\u00e9visible<\/h3>\n\n\n\n<p>Qui n\u2019a pas v\u00e9cu de temp\u00eate en hiver? L\u2019image qui vient le plus souvent \u00e0 l\u2019esprit est celle d\u2019un blizzard. Cependant, quand la temp\u00e9rature tourne autour du z\u00e9ro, les pr\u00e9cipitations peuvent prendre d\u2019autres formes. Le verglas, la bruine vergla\u00e7ante, la gr\u00eale, la neige roul\u00e9e et la neige fondante en sont des exemples.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>Ces pr\u00e9cipitations ont un impact marqu\u00e9 sur la soci\u00e9t\u00e9. Ainsi, la&nbsp;<a href=\"https:\/\/www.thecanadianencyclopedia.ca\/fr\/article\/ice-storm-1998\">temp\u00eate de verglas de 1998<\/a>&nbsp;figure parmi les plus grands cataclysmes dans l\u2019histoire du pays&nbsp;: six cent mille personnes d\u00e9log\u00e9es, 945&nbsp;hospitalisations et 35&nbsp;d\u00e9c\u00e8s, avec des dommages approximatifs de 5,4&nbsp;milliards de dollars. Des temp\u00eates similaires aux pr\u00e9cipitations mixtes malm\u00e8nent les Canadiens partout au pays chaque ann\u00e9e, causant accidents de la circulation, retards de vols ou pannes d\u2019\u00e9lectricit\u00e9 monstres.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote small is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong><strong>Qu\u2019est-ce que le RNRE?<\/strong><\/strong><\/p>\n\n\n\n<p><em><em>Le R\u00e9seau national de recherche et d\u2019\u00e9ducation (RNRE) est un regroupement d\u2019infrastructures, d\u2019outils et de personnes d\u2019une importance capitale dont la raison d\u2019\u00eatre est de rehausser le leadership du Canada dans les domaines de la recherche, de l\u2019enseignement et de l\u2019innovation. Les partenaires du RNRE canadien coop\u00e8rent afin de rendre cette infrastructure indispensable encore plus s\u00fbre. Un projet pancanadien sans pr\u00e9c\u00e9dent dans l\u2019histoire est en cours pour assurer une surveillance coordonn\u00e9e des menaces qui p\u00e8sent sur le r\u00e9seau.<\/em><\/em><\/p>\n<\/blockquote>\n\n\n\n<p>Une des plus grandes difficult\u00e9s que posent les pr\u00e9cipitations quand la temp\u00e9rature voisine le point de cong\u00e9lation est qu\u2019on a beaucoup de mal \u00e0 les pr\u00e9voir avec pr\u00e9cision. En effet, la moindre baisse du mercure aura un effet draconien sur leur nature et leur intensit\u00e9. Pour mieux comprendre les temp\u00eates de ce genre et les pr\u00e9dire avec plus d\u2019exactitude, des chercheurs de l\u2019Universit\u00e9 du Qu\u00e9bec \u00e0 Montr\u00e9al (UQAM) ont commenc\u00e9 \u00e0 recourir \u00e0 des techniques d\u2019observation et \u00e0 des programmes de mod\u00e9lisation num\u00e9rique plus complexes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Attaquer le probl\u00e8me sur deux fronts<\/h3>\n\n\n\n<p>Leurs travaux s\u2019appuient sur deux approches principales. La premi\u00e8re consiste \u00e0 r\u00e9unir de meilleures donn\u00e9es. En collaboration avec des chercheurs de la Saskatchewan et du Colorado, l\u2019\u00e9quipe de l\u2019UQAM compare les relev\u00e9s des stations m\u00e9t\u00e9orologiques sur l\u2019accumulation de pluie et de neige durant les \u00e9pisodes de pr\u00e9cipitations une minute \u00e0 la fois. Ces donn\u00e9es sont ensuite combin\u00e9es \u00e0 d\u2019autres venant de nouveaux capteurs \u00e0 LIDAR qui indiquent avec pr\u00e9cision et en trois dimensions la vitesse et la direction du vent durant ces pr\u00e9cipitations. Gr\u00e2ce \u00e0 ces perfectionnements, les scientifiques saisissent mieux les minuscules d\u00e9tails qui forgent les syst\u00e8mes mod\u00e9lisant le climat.<\/p>\n\n\n\n<p>La deuxi\u00e8me approche consiste \u00e0 am\u00e9liorer les mod\u00e8les climatiques. En ajoutant de nouvelles dimensions aux propri\u00e9t\u00e9s microphysique qui commandent la formation des gouttelettes \u2013 taille des particules, vitesse \u00e0 laquelle elles se forment, conditions qui pr\u00e9ludent \u00e0 leur amalgame, gradient de temp\u00e9rature, trajectoire dans les nuages, l\u2019\u00e9quipe am\u00e9liore consid\u00e9rablement l\u2019estimation des conditions atmosph\u00e9riques et des pr\u00e9cipitations en surface. Ces perfectionnements d\u2019ordre microphysique ne sont toutefois r\u00e9alisables qu\u2019avec les mod\u00e8les \u00e0 plus grande r\u00e9solution qui int\u00e8grent les donn\u00e9es prises au sol pour les extrapoler \u00e0 la colonne atmosph\u00e9rique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">La technologie canadienne \u00e0 la rescousse<\/h3>\n\n\n\n<p>Inutile de dire que le passage des mod\u00e8les climatiques de la deuxi\u00e8me \u00e0 la troisi\u00e8me dimension exige une meilleure r\u00e9solution dans le temps et l\u2019espace. Multiplier les donn\u00e9es des capteurs tout en \u00e9largissant leurs propri\u00e9t\u00e9s engendre un blizzard de donn\u00e9es&nbsp;: 200 \u00e0 300&nbsp;To par jeu. La puissance informatique que n\u00e9cessitent de tels mod\u00e8les \u00e9mane de Calcul Canada tandis que, par sa rapidit\u00e9 exceptionnelle, le R\u00e9seau national de la recherche et de l\u2019\u00e9ducation (RNRE) canadien procure le d\u00e9bit sans lequel les chercheurs ne pourraient collaborer. Le RISQ, partenaire qu\u00e9b\u00e9cois du RNRE, raccorde les scientifiques de l\u2019UQAM \u00e0 leurs homologues du Canada par le truchement des autres partenaires provinciaux et territoriaux du RNRE, puis aux chercheurs du monde entier par le biais de CANARIE, le partenaire f\u00e9d\u00e9ral. Le RNRE connecte les chercheurs canadiens entre eux et avec leurs coll\u00e8gues des \u00c9tats-Unis afin qu\u2019ils puissent \u00e9changer des jeux colossaux de donn\u00e9es et perfectionner sans cesse les mod\u00e8les climatiques, puis comparer leurs r\u00e9sultats comme il serait impossible de le faire sur les r\u00e9seaux commerciaux usuels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Des pr\u00e9visions pragmatiques<\/h3>\n\n\n\n<p>Mieux comprendre les conditions m\u00e9t\u00e9orologiques au point de cong\u00e9lation et la forme que prendront les pr\u00e9cipitations a des retomb\u00e9es tr\u00e8s concr\u00e8tes. En sachant exactement quand tombera la glace, la neige ou la pluie, les municipalit\u00e9s r\u00e9agiront plus vite et plus efficacement. D\u2019autre part, les conditions sur les routes gagneront en s\u00e9curit\u00e9 et on g\u00e8rera les cataclysmes en temps plus opportun. Les crues qui ont r\u00e9cemment d\u00e9vast\u00e9 l\u2019Alberta ne sont qu\u2019une des catastrophes naturelles affect\u00e9es de mani\u00e8re dramatique par la nature des pr\u00e9cipitations et le moment o\u00f9 elles surviennent. Or les ph\u00e9nom\u00e8nes de ce genre se multiplient avec le r\u00e9chauffement de la plan\u00e8te. Les chercheurs de l\u2019UQAM collaborent d\u2019ores et d\u00e9j\u00e0 avec Environnement et Changement climatique Canada afin que chacun profite de la pr\u00e9cision sup\u00e9rieure des mod\u00e8les microphysiques qui reproduisent les conditions voisines du point de cong\u00e9lation. Tous les pays de l\u2019h\u00e9misph\u00e8re nord ont besoin de meilleures pr\u00e9visions et le Canada pave la voie gr\u00e2ce \u00e0 ces recherches de pointe en m\u00e9t\u00e9orologie.<\/p>\n\n\n\n<section class=\"section section--quick-links\">\n    <div class=\"grid-container\">\n      <div class=\"grid-x grid-padding-x\">\n        <div class=\"cell\">\n                  \t<h2>En savoir plus sur RISQ, visitez : <\/h2>\n                                <div class=\"wp-block-buttons\">\n                \t\t\t\t  \t<a class=\"button wp-block-button__link\" href=\"https:\/\/www.risq.quebec\/\" target=\"_blank\">risq.quebec<\/a><br>\n    \t\t\t        \t\t\t  <\/div>\n    \t\t\t          <\/div>\n      <\/div>\n    <\/div>\n  <\/section>","protected":false},"excerpt":{"rendered":"<p>\u00c9tude de cas du RNRE par&nbsp;RISQ Une m\u00e9t\u00e9o hivernale impr\u00e9visible Qui n\u2019a pas v\u00e9cu de temp\u00eate en hiver? L\u2019image qui [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":7023,"parent":7168,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-7331","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RISQ - CANARIE<\/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:\/\/www.canarie.ca\/fr\/rnre\/etudes-de-cas\/risq\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RISQ - CANARIE\" \/>\n<meta property=\"og:description\" content=\"\u00c9tude de cas du RNRE par&nbsp;RISQ Une m\u00e9t\u00e9o hivernale impr\u00e9visible Qui n\u2019a pas v\u00e9cu de temp\u00eate en hiver? 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