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"PROJCS[\"WGS_1984_Web_Mercator_Auxiliary_Sphere\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator_Auxiliary_Sphere\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Standard_Parallel_1\",0.0],PARAMETER[\"Auxiliary_Sphere_Type\",0.0],UNIT[\"Meter\",1.0]]", "wkid": 3857 }, "description": "<p>Cette thématique présente l\u2019évolution des concentrations ambiantes des paramètres physicochimiques et bactériologiques de l\u2019eau des rivières du Québec méridional et du fleuve Saint-Laurent. Les tendances temporelles sont déterminées sur une période de 10 ans (2015 à 2024). La tendance observée dans les concentrations renseigne sur l\u2019évolution de la qualité ambiante d\u2019un cours d\u2019eau.</p><p>Les tendances temporelles sur 10 ans sont calculées sur des concentrations non ajustées pour l\u2019effet des débits. Ces tendances sont disponibles pour cinq paramètres physicochimiques et un paramètre bactériologique pour la période 2015-2024, soit l\u2019azote ammoniacal dissous, l\u2019azote total dissous, la chlorophylle α active, les nitrites-nitrates dissous, les matières en suspension puis les coliformes fécaux (paramètre bactériologique). Des tableaux et des figures, portant sur les tendances produites, sont disponibles dans la table attributaire du jeu de données.</p><p>Les tendances temporelles du phosphore total n'ont pas été produites en raison d'une sous-estimation provoquée par un changement de méthode analytique affectant la majorité des données ciblées pour les calculs. En effet, certaines analyses de phosphore réalisées entre 2011 et 2021 peuvent comporter une sous-estimation causée par une interférence des chlorures. Cette possibilité de sous-estimation concerne les appareils munis d\u2019un filtre d\u2019une longueur d\u2019onde de 880 nm et utilisant le chlorure stanneux comme réactif, à la suite d\u2019une digestion au persulfate à l\u2019autoclave. La sous-estimation ne concerne pas les échantillons avec une faible concentration de chlorures. La présence de données sous-estimées et non sous-estimées dans les séries 2004 2023 et 2015 2024 crée une incertitude trop importante pour détecter et estimer correctement les tendances temporelles, ce qui en limite fortement la validité.</p><p>Les tendances temporelles sur 10 ans de la qualité de l\u2019eau sont analysées à l\u2019aide de tests non paramétriques sur les données mensuelles d\u2019une station d\u2019échantillonnage. Le choix du test non paramétrique de détection de tendance se fait en fonction de la présence de saisonnalité et de dépendance des données (autocorrélation), ainsi que la proportion de données censurées (p. ex. : valeurs sous la limite de détection de la méthode). Dans certains cas où les données manquantes ou censurées sont plus importantes ou en présence d\u2019autocorrélation, des tests paramétriques additionnels sont effectués pour valider la présence ou non de tendances. Une tendance est validée lorsque les valeurs-p du test principal ainsi que la valeur-p du test paramétrique sont significatives au même seuil (p &lt; 0,05, p &lt; 0,1 ou p &lt; 0,2). Le résultat de la tendance doit être interprété avec précaution lorsque les valeurs-p du test principal et du test de validation divergent. En absence de test paramétrique (validation non requise), le test principal est considéré valide. 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"PROJCS[\"WGS_1984_Web_Mercator_Auxiliary_Sphere\",GEOGCS[\"GCS_WGS_1984\",DATUM[\"D_WGS_1984\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Mercator_Auxiliary_Sphere\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",0.0],PARAMETER[\"Standard_Parallel_1\",0.0],PARAMETER[\"Auxiliary_Sphere_Type\",0.0],UNIT[\"Meter\",1.0]]", "wkid": 3857 }, "description": "<p>Cette thématique présente l\u2019évolution des concentrations et des charges (poids par unités de temps; p. ex.: tonne/an) d\u2019éléments physicochimiques et bactériologique sur une période de 20 ans (2004 à 2023). La tendance observée dans les concentrations renseigne sur l\u2019évolution de la qualité ambiante d\u2019un cours d\u2019eau, tandis que la tendance observée dans les charges renseigne sur l\u2019évolution d\u2019un élément exportée vers le milieu récepteur. Les tendances sur les charges sont particulièrement pertinentes pour les cours d'eau se déversant dans un lac ou le fleuve Saint-Laurent.</p><p>Les tendances temporelles sur 20 ans sont calculées sur des concentrations ajustées pour l\u2019effet des débits. Ces calculs permettent d\u2019estimer des tendances d\u2019un paramètre en éliminant mathématiquement l\u2019effet des variations hydrologiques naturelles sur la qualité de l\u2019eau. Cela permet de s'assurer qu'une tendance estimée ne soit pas attribuable à une tendance dans les débits, donc permet d\u2019évaluer l\u2019efficacité des politiques, des règlements et des mesures correctives déployées pour réduire les apports d\u2019un paramètre dans les cours d\u2019eau et leur milieu récepteur. Ces tendances sont disponibles pour cinq paramètres physicochimiques et un paramètre bactériologique pour la période 2004-2023, soit l\u2019azote ammoniacal dissous, l\u2019azote total dissous, la chlorophylle α active, les nitrites-nitrates dissous, les matières en suspension puis les coliformes fécaux (paramètre bactériologique). Des tableaux et des figures, portant sur les tendances produites, sont disponibles dans la table attributaire du jeu de données.  </p><p>Les tendances temporelles du phosphore total n'ont pas été produites en raison d'une sous-estimation provoquée par un changement de méthode analytique affectant la majorité des données ciblées pour les calculs. En effet, certaines analyses de phosphore réalisées entre 2011 et 2021 peuvent comporter une sous-estimation causée par une interférence des chlorures. Cette possibilité de sous-estimation concerne les appareils munis d\u2019un filtre d\u2019une longueur d\u2019onde de 880 nm et utilisant le chlorure stanneux comme réactif, à la suite d\u2019une digestion au persulfate à l\u2019autoclave. La sous-estimation ne concerne pas les échantillons avec une faible concentration de chlorures. 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Les limites sont générées à l\u2019aide d\u2019un système d\u2019information géographique (SIG) à partir des cartes topographiques, de modèles numériques d\u2019élévation et de modèles d\u2019écoulement, et des limites de bassins versants produites par la Direction principale de l\u2019expertise hydrique (DPEH).L\u2019aire de drainage sert à calculer la superficie drainée en amont de la station d\u2019échantillonnage, à caractériser le territoire drainé (par exemple, pour déterminer l\u2019utilisation du territoire) et à répondre à des besoins spécifiques de cartographie. La classification générale de l\u2019utilisation du territoire a été compilée pour chaque aire de drainage (forestier, agricole, humide, aquatique et anthropique). À noter que le territoire hors Québec n\u2019est pas considéré dans la compilation des pourcentages d\u2019utilisation du territoire. 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