Evaluating diffuse and point source phosphorus inputs to streams in a cold climate region using a Load Apportionment Model

Rattan, K. J.; Bowes, M. J.; Yates, A. G.; Culp, J. M.; Chambers, P. A.

doi:https://open-science.canada.ca/handle/123456789/708

Evaluating diffuse and point source phosphorus inputs to streams in a cold climate region using a Load Apportionment Model

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dc.contributor.author: Rattan, K. J.; Bowes, M. J.; Yates, A. G.; Culp, J. M.; Chambers, P. A.
dc.date.accepted: 2020-05-06
dc.date.accessioned: 2023-06-13T14:21:02Z
dc.date.available: 2023-06-13T14:21:02Z
dc.date.issued: 2021-06-02
dc.date.submitted: 2019-11-21
dc.description - en: Variation in the timing and quantity of non point and point source inputs of phosphorus (P) to streams can be evaluated by using P concentration – flow relationships. This study tested the suitability of a load apportionment model, a power-law function of flow, to estimate contributions of diffuse and point inputs to P loads for eight sub-watersheds in the Red River Valley, a cold-climate rural region of Manitoba, Canada. The models identified significant point-source inputs during summer to both watersheds and during snowmelt for one watershed.
dc.description.abstract - en: Variation in the timing and quantity of diffuse versus point-source inputs of phosphorus (P) to streams can be evaluated by examining P concentration-flow relationships. Diffuse load inputs usually increase with stream flow (due to increased delivery caused by precipitation), whereas point-source concentrations decrease with rising river flow (due to increased dilution). This study tested the suitability of a load apportionment model (LAM), a power-law function of flow, to estimate contributions of diffuse and point inputs to P loads for eight sub- watersheds in the Red River Valley, a cold-climate rural region of Manitoba, Canada. For all but two sub-watersheds, annual and seasonal (snowmelt and summer) models of P concentration versus flow best fit a strictly diffuse source contribution. The models identified significant point-source inputs (in addition to diffuse sources) to two sub-watersheds, during summer to both watersheds (consistent with the fact that wastewater from sewage lagoons is discharged to upstream reaches between June and September) and during snowmelt for one watershed. Application of a LAM proved to be a simple and rapid method for nutrient source apportionment, and detection of unknown sources, for cold-climate rural sub-watersheds. Such information is critical for developing the most effective mitigation strategies to reduce P concentrations and eutrophication risk.
dc.description.fosrctranslation - fr: La variation du moment et de la quantité d’apports de phosphore (P) provenant de sources non ponctuelles et ponctuelles dans les cours d’eau peut être évaluée en utilisant la relation concentration-débit de P. Cette étude a mis à l’essai la pertinence d’un modèle de répartition des charges, une fonction d’écoulement en fonction de la puissance, pour estimer les contributions des apports diffus et ponctuels aux charges de P pour huit sous-bassins versants dans la vallée de la rivière Rouge, une région rurale du Manitoba, au Canada, à climat froid. Les modèles ont identifié d’importants apports de sources ponctuelles pendant l’été dans les bassins versants et pendant la fonte des neiges pour un bassin hydrographique.
dc.identifier.issn: 2773-0719; 0380-1330
dc.identifier.uri: https://open-science.canada.ca/handle/123456789/708
dc.language.iso: en
dc.publisher: ScienceDirect
dc.relation.isreplacedby: https://doi.org/10.1016/j.jglr.2020.05.003
dc.rights - en: Open Government Licence - Canada
dc.rights - fr: Licence du gouvernement ouvert - Canada
dc.rights.openaccesslevel - en: Green
dc.rights.openaccesslevel - fr: Vert
dc.rights.uri - en: https://open.canada.ca/en/open-government-licence-canada
dc.rights.uri - fr: https://ouvert.canada.ca/fr/licence-du-gouvernement-ouvert-canada
dc.subject - en: Nature and environment; Water; Science and technology
dc.subject - fr: Nature et environnement; Eau; Sciences et technologie
dc.subject.en - en: Nature and environment; Water; Science and technology
dc.subject.fr - fr: Nature et environnement; Eau; Sciences et technologie
dc.title - en: Evaluating diffuse and point source phosphorus inputs to streams in a cold climate region using a Load Apportionment Model
dc.type - en: Accepted manuscript
dc.type - fr: Manuscrit accepté
local.article.journalissue: 3
local.article.journaltitle: Journal of Great Lakes Research
local.article.journalvolume: 47
local.pagination: 35 pages
local.peerreview - en: Yes
local.peerreview - fr: Oui