{"id":16639,"date":"2023-02-13T19:10:17","date_gmt":"2023-02-13T18:10:17","guid":{"rendered":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/?p=16639"},"modified":"2024-01-30T15:50:04","modified_gmt":"2024-01-30T14:50:04","slug":"estudiem-a-fons-la-riera-de-vallvidrera","status":"publish","type":"post","link":"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/general\/estudiem-a-fons-la-riera-de-vallvidrera\/","title":{"rendered":"Estudiem a fons la riera de Vallvidrera"},"content":{"rendered":"<p>El dilluns 13 de febrer, els estudiants de Ci\u00e8ncies de la Terra i del Medi Ambient de 2n de Batxillerat de l&#8217;<a href=\"https:\/\/www.institutmarina.cat\/\" target=\"_blank\" rel=\"noopener\">Institut Marina<\/a> de La Llagosta han avaluat <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/geologia\/risc-dinundacio-a-la-riera-de-vallvidrera\/\" target=\"_blank\" rel=\"noopener\">el risc d&#8217;inundaci\u00f3 de la riera de Vallvidrera<\/a> a la zona on desemboca al riu Llobregat i tamb\u00e9 ha conegut <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/ambits\/dinamica-dels-ecosistemes\/introduccio-a-la-limnologia-cursos-fluvials\/\" target=\"_blank\" rel=\"noopener\">l&#8217;estat ecol\u00f2gic de la riera<\/a> aig\u00fces amunt, en el seu pas per la zona de La Rierada.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16662 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/IMG_20230213_152753-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/IMG_20230213_152753-300x300.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/IMG_20230213_152753-150x150.jpg 150w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/IMG_20230213_152753.jpg 350w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Hem comen\u00e7at calculant l&#8217;afectaci\u00f3 a tres ponts de Molins de Rei per possibles avingudes provinents de la riera de Vallvidrera. La darrera inundaci\u00f3 d&#8217;aquesta vall es va produir a la d\u00e8cada dels anys noranta, afectant a les vies i a la circulaci\u00f3 de trens. El repte principal es calcular el cabal m\u00e0xim que podria arribar la vall baixa de la riera de Vallvidrera abans de la seva desembocadura al riu Llobregat.<\/p>\n<p>Els estudiants han emprat dades clim\u00e0tiques hist\u00f2riques, dades geogr\u00e0fiques de la conca fluvial i han efectuat c\u00e0lculs per a per\u00edodes de retorn de 100 i 500 anys. Els ha calgut trobar les \u00e0rees de pas dels tres ponts: el de Rodalies R-4, el del pol\u00edgon del Mol\u00ed i el de la\u00a0 C-1413A. A nivell m\u00e9s te\u00f2ric, han aplicat m\u00e8todes de c\u00e0lcul algor\u00edtmics senzills i han conegut els que empra l&#8217;<a href=\"http:\/\/aca.gencat.cat\/ca\/inici\" target=\"_blank\" rel=\"noopener\">Ag\u00e8ncia Catalana de l&#8217;Aigua<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16659 alignright\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/PHOTO-2023-02-13-14-57-13-1-300x245.jpg\" alt=\"\" width=\"300\" height=\"245\" srcset=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/PHOTO-2023-02-13-14-57-13-1-300x245.jpg 300w, https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/PHOTO-2023-02-13-14-57-13-1.jpg 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Han obtingut que l&#8217;\u00e0rea de la conca hidrol\u00f2gica \u00e9s d&#8217;uns 25 km<sup>2<\/sup> i la riera mesura uns 13 Km de longitud. Un cop calculades les \u00e0rees de pas dels ponts han comprovat que cap dels tres ponts podria engolir l&#8217;aigua que s&#8217;acumularia amb pluges d&#8217;un per\u00edode de retorn de 100 i 500 anys El resultats obtinguts els han fet pensar en les vulnerabilitats a les persones, als serveis del pol\u00edgon industrial i a les pr\u00f2pies infraestructures vi\u00e0ries.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16663 alignleft\" src=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/wp-content\/uploads\/usu1385\/2023\/02\/20230213_131027.jpg\" alt=\"\" width=\"194\" height=\"300\" \/><\/p>\n<p>Despr\u00e9s ens hem traslladat fins al <a href=\"https:\/\/serveiseducatius.xtec.cat\/cda-cansantoi\/\" target=\"_blank\" rel=\"noopener\">CdA de Can Santo<\/a>i per completar la feina. Primer han mesurat par\u00e0metres com la velocitat, l&#8217;amplada i diverses fond\u00e0ries de la riera per obtenir el cabal.\u00a0 A continuaci\u00f3 amb fet breu estudi de la qualitat de l&#8217;aigua de\u00a0 la\u00a0 riera fent servir com a bioindicadors els macroinvertebrats que han capturat<em> in situ<\/em>. Un cop al laboratori amb l&#8217;ajuda de lupes binoculars i fitxes han identificat els invertebrats aix\u00ed com l&#8217;index bi\u00f3tic associat a cada esp\u00e8cie. Amb totes les dades recopilades podran con\u00e8ixer l&#8217;estat de conservaci\u00f3 de l&#8217;ecosistema de la riera.<\/p>\n<p>&nbsp;<\/p>\n<p>Felicitats per tota la feina que heu portat a terme!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El dilluns 13 de febrer, els estudiants de Ci\u00e8ncies de la Terra i del Medi Ambient de 2n de Batxillerat de l&#8217;Institut Marina de La Llagosta han avaluat el risc d&#8217;inundaci\u00f3 de la riera de Vallvidrera a la zona on desemboca al riu Llobregat i tamb\u00e9 ha conegut l&#8217;estat ecol\u00f2gic de la riera aig\u00fces amunt, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":16658,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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