Suspended Sediment Concentrations Downstream of a Harvested Peat Bog: Analysis and Preliminary Modelling of Exceedances Using Logistic Regression

St‐Hilaire, André; Courtenay, Simon C.; Díaz-Delgado, Carlos; Pavey, Bronwyn; Ouarda, Taha B. M. J.; Boghen, Andrew D.; Bobée, Bernard

doi:10.4296/cwrj3103139

Cited by 17 publications

(17 citation statements)

References 21 publications

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“…From the comparison between months of each year, 50% of coefficients of correlation were inferior or equal to the absolute value of 0.30; and more than 75% of values of coefficients of correlation were inferior or equal to the absolute value of 0.50. These results on the concentration of suspended matters in the sedimentation basins of drained peatlands confirm those previously done in eastern New Brunswick [34][35][36], except that these previous studies were focused in spring and autumn with continuous measurements. The results acquired for the suspended solids rate in this case of study could probably be explained by climate events (excessive precipitations or winds) or by the knowing of the maintenance conditions of sedimentation basins.…”

Section: Suspended Solids Concentrations: Spatial and Temporal Variabsupporting

confidence: 89%

“…Indeed, a previous study done by Es-Salhi et al [36] in New Brunswick demonstrated that the rate of suspended matters from sedimentation basin of drained peatlands exceeded 25 mg·L -1 several times; the same observation was found in a study completed during the spring season in Ref. [34]. Thus, the peatlands drainage is one of the causes of an excess of solids suspension in the water system.…”

Section: Suspended Solids Impactsmentioning

confidence: 68%

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Suspended Solids from Drained Peatlands in the East Coastal Zone of New Brunswick: Point Estimates and Climate Effects on the Environment

Quenum¹,

Tétégan²,

Sall³

2015

JESE-A

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Peatlands represent one of the most important economic resources and abandoned peatlands after mining can be considered as ecological resources by re-vegetation restoration or management. However, some environmental problems like particles from peatlands and their effects in the water system have to be characterized. Since centuries, artificial drainage has been a current practice for the mining of peatlands. Mainly mined for horticultural purpose, New Brunswick's peatlands-predominantly located in the eastern of the province-cover about 140,000 ha. At the downstream end of the drainage system, the water from peatlands flow into sedimentation basins. Drainage waters are often laden with solid particles. Once they have flowed through the ponds to allow sediment settling, the water is released into the water system. This paper describes the spatio-temporal evolution of suspended solids from 12 New Brunswick drained peatlands. The studied sites were characterized by some heterogeneity in the concentration of suspended solids. This study also provides knowledge on the suspended solids amount that can be released by drained peatlands, and it proposes a function to estimate the concentration of suspended solids by using climate variables; and identifies some potential ecological risks.

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Section: Suspended Solids Concentrations: Spatial and Temporal Variabsupporting

confidence: 89%

Section: Suspended Solids Impactsmentioning

confidence: 68%

Suspended Solids from Drained Peatlands in the East Coastal Zone of New Brunswick: Point Estimates and Climate Effects on the Environment

Quenum¹,

Tétégan²,

Sall³

2015

JESE-A

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“…There are still many methods which have been used successfully in many forecasting applications in engineering and science; however, they have not yet been fully explored in water temperature modelling. Examples include parametric approaches, such as the logistic regression for threshold exceedance (St-Hilaire et al, 2006), and geostatistical models (Gardner et al, 2003). Nonparametric models include artificial neural networks (Bélanger et al, 2005) and regression trees (Dzeroski et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Comparison of non-parametric and parametric water temperature models on the Nivelle River, France

Benyahya

St‐Hilaire

Ouarda

et al. 2008

Hydrological Sciences Journal

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Water temperature is an important abiotic variable in aquatic habitat studies and may be one of the factors limiting the potential fish habitat (e.g. salmonids) in a stream. Stream water temperatures are modelled using statistical approaches with air temperature and streamflow as exogenous variables in the Nivelle River, southern France. Two different models are used to model mean weekly maximum temperature data: a non-parametric approach, the k-nearest neighbours method (k-NN) and a parametric approach, the periodic autoregressive model with exogenous variables (PARX). The k-NN is a data-driven method, which consists of finding, at each point of interest, a small number of neighbours nearest to this value, and the prediction is estimated based on these neighbours. The PARX model is an extension of commonly-used autoregressive models in which parameters are estimated for each period within the years. Different variants of air temperature and flow are used in the model development. In order to test the performance of these models, a jack-knife technique is used, whereby model goodness of fit is assessed separately for each year. The results indicate that both models give good performances, but the PARX model should be preferred, because of its good estimation of the individual weekly temperatures and its ability to explicitly predict water temperature using exogenous variables.Key words stream water temperature; non-parametric vs parametric models; PARX, k-nearest neighbours Comparaison de modèles paramétriques et non-paramétriques de température de l'eau de la Rivière Nivelle, France Résumé La température de l'eau est une variable très importante pour les études d'habitat aquatique. Elle peut être un facteur limitant pour plusieurs espèces de poisson, telles que les salmonidés. Cet article présente une modélisation statistique de la température de l'eau en utilisant la température de l'air et le débit comme variables explicatives. Les données utilisées dans la modélisation numérique sont les températures hebdomadaires de la rivière Nivelle (France). Deux modèles de température de l'eau sont alors proposés et comparés, soit la méthode non-paramétrique des k plus proches voisins (VPP) et le modèle périodique autorégressif avec variables exogènes (PARX). La méthode des VPP consiste à chercher dans tout l'historique, les k plus proches voisins qui serviront à estimer la température actuelle. Le modèle PARX est un modèle autorégressif dont les paramètres de chaque variable explicative sont estimés indépendamment pour chaque période de l'année. Plusieurs attributs de température de l'eau et du débit sont considérés. La performance des modèles a été évaluée pour chaque année en utilisant une technique de validation croisée de type "jack-knife". Les résultats préliminaires ont montré que le modèle PARX et le modèle VPP présentent une performance similaire dans la simulation des températures hebdomadaires. Toutefois, le modèle PARX demeure le plus approprié, car il préserve la persistance des séries périodiques ...

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“…Also, organic and inorganic load can vary spatially depending on erosion and weathering conditions in upstream areas. St-Hilaire et al (2006) reported a turbidity study downstream a peat extraction bog. However, the effect of the physical characteristics of the transported sediment (particle size etc.)…”

Section: Problem Statement and Study Objectivesmentioning

confidence: 99%

Calibration of turbidity meter and acoustic doppler velocimetry (Triton‐ADV) for sediment types present in drained peatland headwaters: Focus on particulate organic peat

Marttila

Postila

2009

River Research & Apps

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Suspended sediments have a clear impact on fluvial water quality and aquatic habitats. As the concentrations are highly variable, continuous measurement offers a good way to provide accurate and precise values of sediment concentration and yield. However, there is a lack of information regarding the effect of organic peat particles, which typically appear in boreal fluvial systems. In the present study, the effect of different types of suspended sediments on calibration of a turbidity meter and an acoustic Doppler velocimetry (Triton-ADV) was studied in laboratory conditions. The measurements were performed using particulate organic peat, clay and silt with several concentrations ranging from clear water to 3500 mg L À1. The present study primarily provides organic peat sediment calibration data for used sensors. Regression equations were developed for the different sediment. The results indicate that particle size, shape, concentration and sediment type have an effect on calibration. When the turbidity and the ADV calibration were performed for different particle size groups, sediment types and concentrations, the calibration and suspended solids calculation error was reduced. For the turbidity sensor used, the reliable upper continuous measurement limit for clay, peat and silt sediments was found to be at 1000, 2500 and 3500 mg L À1 , respectively. The ADV-sensor was noticed to be reliable only with fine particles. The results enable easy and first step calibration and error assessment for automatic turbidity and acoustic monitoring of the suspended sediment quality typically present in headwater fluvial systems. This study can be used to evaluate the effect of different sediments on turbidity and ADV-measuring error and reliability during changing particles size distributions, characteristics and concentrations. The laboratory-based approach used in this study indicates that the shape of organic peat particles has an influence on sensor calibration, especially when suspended sediment concentrations are high.

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Suspended Sediment Concentrations Downstream of a Harvested Peat Bog: Analysis and Preliminary Modelling of Exceedances Using Logistic Regression

Cited by 17 publications

References 21 publications

Suspended Solids from Drained Peatlands in the East Coastal Zone of New Brunswick: Point Estimates and Climate Effects on the Environment

Suspended Solids from Drained Peatlands in the East Coastal Zone of New Brunswick: Point Estimates and Climate Effects on the Environment

Comparison of non-parametric and parametric water temperature models on the Nivelle River, France

Calibration of turbidity meter and acoustic doppler velocimetry (Triton‐ADV) for sediment types present in drained peatland headwaters: Focus on particulate organic peat

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