{"id":1232,"date":"2023-07-25T14:54:49","date_gmt":"2023-07-25T12:54:49","guid":{"rendered":"http:\/\/nagare.tech\/?page_id=1232"},"modified":"2023-07-25T15:54:29","modified_gmt":"2023-07-25T13:54:29","slug":"optimisation-du-plan-de-monitoring-de-sites-pollues","status":"publish","type":"page","link":"http:\/\/nagare.tech\/?page_id=1232","title":{"rendered":"Optimisation du plan de monitoring de sites pollu\u00e9s"},"content":{"rendered":"\t\t
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La technologie de Nagar\u00e9 a \u00e9t\u00e9 mise en \u0153uvre sur un site industriel bord\u00e9 par une rivi\u00e8re dans la r\u00e9gion de Bruxelles, en Belgique. L’aquif\u00e8re alluvial est contamin\u00e9 par 8 m\u00e9taux lourds et pr\u00e9sente un risque de dispersion dans la rivi\u00e8re. L’\u00e9valuation des risques bas\u00e9e sur la concentration n’ayant pas permis de quantifier pr\u00e9cis\u00e9ment le risque de rejet dans la rivi\u00e8re, un plan de gestion des risques lourd et co\u00fbteux, comprenant 43 puits de surveillance \u00e9chantillonn\u00e9s deux fois par an et pendant 21 ans, a \u00e9t\u00e9 mis en \u0153uvre.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Les mesures de flux des eaux souterraines ont \u00e9t\u00e9 effectu\u00e9es sur 43 puits de surveillance, r\u00e9partis comme un panneau de contr\u00f4le le long de la limite du site. Ces mesures ont permis de caract\u00e9riser l’h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9 spatiale de l’\u00e9coulement des eaux souterraines et de quantifier le d\u00e9bit total des eaux souterraines \u00e0 travers la limite du site et alimentant la rivi\u00e8re.<\/p>

Les flux massiques de m\u00e9taux lourds et les d\u00e9bits massiques ont \u00e9t\u00e9 calcul\u00e9s sur la base des flux d’eaux souterraines et des concentrations de m\u00e9taux obtenus lors de la campagne de surveillance men\u00e9e par le bureau d’\u00e9tude. L’utilisation des d\u00e9bits massiques a permis d’\u00e9valuer directement le risque de dispersion des m\u00e9taux lourds et de r\u00e9duire significativement le plan de monitoring en place.<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\u00a0<\/p>

Sur les 8 m\u00e9taux pr\u00e9sents dans les eaux souterraines \u00e0 des concentrations sup\u00e9rieures \u00e0 la valeur seuil, Nagar\u00e9 a d\u00e9montr\u00e9 que seul 1 d’entre eux est susceptible de pr\u00e9senter un risque pour la rivi\u00e8re. Selon l’hypoth\u00e8se conservatrice la plus pessimiste, le d\u00e9bit massique total des 7 m\u00e9taux n’est pas suffisant pour menacer la qualit\u00e9 de l’eau de la rivi\u00e8re.
L’approche par d\u00e9bit massique a \u00e9galement permis de mieux analyser l’\u00e9volution temporelle de l’importance des rejets. Une analyse de tendance\u00a0 robuste a montr\u00e9 une diminution globale de la masse totale de la d\u00e9charge des m\u00e9taux depuis 2014, ce qui \u00e9tait impossible \u00e0 prouver jusqu’\u00e0 pr\u00e9sent sur la base des seules concentrations.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\u00c9tant donn\u00e9 qu’un seul m\u00e9tal pr\u00e9sente un risque pour la rivi\u00e8re, que l’analyse des tendances a montr\u00e9 une diminution des rejets globaux et que la variabilit\u00e9 spatiale des rejets de m\u00e9taux dans les eaux souterraines a \u00e9t\u00e9 caract\u00e9ris\u00e9e, il a \u00e9t\u00e9 possible d’optimiser le plan de surveillance en cours.
Nagar\u00e9 a ainsi permis de r\u00e9duire le nombre de pi\u00e9zom\u00e8tres \u00e0 monitorer en se focalisant uniquement sur les pi\u00e9zom\u00e8tres localis\u00e9s dans la zone de fortes d\u00e9charges. La dur\u00e9e du monitoring a \u00e9galement pu \u00eatre r\u00e9duite de plus de 50% gr\u00e2ce \u00e0 l’analyse de tendance robuste obtenue par les donn\u00e9es des d\u00e9bits massiques. <\/p>

Sur l’ensemble de l’\u00e9tude, Nagar\u00e9 a ainsi permis d’\u00e9conomiser 70 % du co\u00fbt total<\/b> du plan de monitoring initial.
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La technologie de Nagar\u00e9 a \u00e9t\u00e9 mise en \u0153uvre sur un site industriel bord\u00e9 par une rivi\u00e8re dans la r\u00e9gion de Bruxelles, en Belgique. L’aquif\u00e8re alluvial est contamin\u00e9 par 8 m\u00e9taux lourds et pr\u00e9sente un risque de dispersion dans la rivi\u00e8re. L’\u00e9valuation des risques bas\u00e9e sur la concentration n’ayant pas permis de quantifier pr\u00e9cis\u00e9ment le … <\/p>\n

Lire la suite de\u00ab\u00a0Optimisation du plan de monitoring de sites pollu\u00e9s\u00a0\u00bb<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-1232","page","type-page","status-publish","hentry"],"aioseo_notices":[],"yoast_head":"\nOptimisation du plan de monitoring de sites pollu\u00e9s - NAGARE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/nagare.tech\/?page_id=1232\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optimisation du plan de monitoring de sites pollu\u00e9s - NAGARE\" \/>\n<meta property=\"og:description\" content=\"La technologie de Nagar\u00e9 a \u00e9t\u00e9 mise en \u0153uvre sur un site industriel bord\u00e9 par une rivi\u00e8re dans la r\u00e9gion de Bruxelles, en Belgique. 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