Suspended sediment transport regime in a debris-flow gully on Vancouver Island, British Columbia

Nistor, Craig; Church, Michael

doi:10.1002/hyp.5549

Cited by 76 publications

(76 citation statements)

References 16 publications

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“…The storm intra-and inter-variations in SSC-Q relationships, with marked hysteresis, were also verified in different land uses, even in assumed balanced forest watersheds (e.g. Thomas, 1988;Nistor & Church, 2005;Gomi et al, 2005;Sadeghi et al, 2008b). Further improvements have been noted through subdividing calibration data sets into seasonal or hydrological groupings (Walling, 1977b;Jansson, 1996;Sichingabula, 1998;Asselman, 2000;Sadeghi et al, 2006Sadeghi et al, , 2008bSchmidt & Morche, 2006).…”

Section: Introductionmentioning

confidence: 90%

Reliability of sediment rating curves for a deciduous forest watershed in Iran

Sadeghi

Pari

2010

Hydrological Sciences Journal

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The suspended sediment load in a river is an indicator of its health. Yet, the direct measurement of suspended sediment load is difficult. Most assessments of suspended sediment load are therefore estimated from relationships developed between suspended sediment concentration and discharge, as sediment rating curves. However, these are not able to provide sufficiently accurate results. The present study aimed to assess the accuracy of the sediment rating curve in the educational forest watershed of Tarbiat Modares University in northern Iran. Water and suspended sediment sampling were conducted via depth-integration at daily and storm-wise scales, and the samples were analysed through decantation procedure. Towards this attempt, various sediment rating curves were examined for different data sets classified on the basis of various governing conditions. The relationships between study variables were assessed by applying a bivariate regression method and descriptive statistics. The results of fitting rating curves on suspended sediment and water discharge, with respective averages of 1.256 AE 2.835 g L -1 and 0.556 AE 0.444 m 3 s -1 , verified that no sediment rating curve could be reliably used for the study area. Scrutinizing the results also verified that the data stratification and increasing time resolution led to better model performance, though their accuracy has not been statistically and logically tested.Key words forest watershed; sediment rating curve; suspended sediment; regression model; Iran Fiabilité des courbes de transport sédimentaire d'un bassin versant forestier feuillu en Iran Résumé La charge de sédiments en suspension dans une rivière est un indicateur de sa santé. Pourtant, la mesure directe de la charge de sédiments en suspension est difficile. Les évaluations de la charge de sédiments en suspension sont donc pour la plupart basées sur des relations développées entre la concentration de sédiments en suspension et le débit, soit les courbes de transport sédimentaire. Toutefois, celles-ci ne donnent pas de résultats suffisamment précis. La présente étude vise à évaluer la précision de transport solide dans le bassin versant forestier pédagogique de l'Université Tarbiat Modares dans le nord de l'Iran. Des prélèvements d'eau et de sédiments en suspension ont été réalisés par intégration verticale, aux pas de temps journalier et événementiel, et les échantillons ont été analysés à travers une procédure de décantation. A l'occasion de cette étude, plusieurs courbes de transport sédimentaire ont été examinées vis-à-vis de différents jeux de données classifiées selon plusieurs règles. Les relations entre les variables de l'étude ont été évaluées en appliquant une méthode de régression bivariée et des statistiques descriptives. Les résultats de l'ajustement de courbes aux dynamiques des sédiments en suspension et des débits liquides, avec des moyennes respectives de 1.256 AE 2.835 g L -1 et de 0.556 AE 0.444 m 3 s -1 , confirment qu'aucune courbe de transport sédimentaire ne peut être étab...

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Section: Introductionmentioning

confidence: 90%

Reliability of sediment rating curves for a deciduous forest watershed in Iran

Sadeghi

Pari

2010

Hydrological Sciences Journal

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“…Landslide activity and debris flows are common at Russell Creek and surrounding areas (Fannin and Wise, 2001;Nistor and Church, 2005). Areas with similar topography, climate, and soil types as this watershed are also prone to landslides.…”

Section: Landslide Hazardmentioning

confidence: 98%

Dye staining and excavation of a lateral preferential flow network

Anderson

Weiler²,

Alila

et al. 2009

Hydrol. Earth Syst. Sci.

107

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Abstract. Preferential flow paths have been found to be important for runoff generation, solute transport, and slope stability in many areas around the world. Although many studies have identified the particular characteristics of individual features and measured the runoff generation and solute transport within hillslopes, very few studies have determined how individual features are hydraulically connected at a hillslope scale. In this study, we used dye staining and excavation to determine the morphology and spatial pattern of a preferential flow network over a large scale (30 m). We explore the feasibility of extending small-scale dye staining techniques to the hillslope scale. We determine the lateral preferential flow paths that are active during the steady-state flow conditions and their interaction with the surrounding soil matrix. We also calculate the velocities of the flow through each cross-section of the hillslope and compare them to hillslope scale applied tracer measurements. Finally, we investigate the relationship between the contributing area and the characteristics of the preferential flow paths. The experiment revealed that larger contributing areas coincided with highly developed and hydraulically connected preferential flow paths that had flow with little interaction with the surrounding soil matrix. We found evidence of subsurface erosion and deposition of soil and organic material laterally and vertically within the soil. These results are important because they add to the understanding of the runoff generation, solute transport, and slope stability of preferential flow-dominated hillslopes.

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“…Some of the well known processes discussed by Walling [1977a] and Nistor and Church [2005] that lead to this scatter include (1) inaccuracies in field and laboratory measurements, (2) the dynamics of erosion and sediment yield (such as hysteretic sediment concentration effects, spatial variability in rainfall location or antecedent conditions), and (3) nonstationarity (ie. temporal changes) in basin response.…”

Section: Introductionmentioning

confidence: 99%

Applying bootstrap resampling to quantify uncertainty in fluvial suspended sediment loads estimated using rating curves

Rustomji

Wilkinson

2008

Water Resources Research

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[1] Knowledge of suspended sediment loads in rivers is essential for catchment management purposes and study of landscape evolution. Obtaining such information is difficult because of the often sparse physical sampling of sediment concentrations and high temporal variability in discharge and sediment concentration, as well as strong hysteretic effects and temporal and spatial variations in catchment condition. Here bootstrap and Monte Carlo resampling techniques are used to calculate suspended sediment loads using sediment rating curves. The method proposed avoids the need to apply a bias correction factor to load estimates calculated using rating curves defined by least squares regression of log-transformed data. The algorithm also quantifies uncertainty in suspended sediment load estimates arising from uncertainty in the shape of the rating curve and the residual scatter in the data. Applied to 11 gauging stations in the catchment of Lake Burragorang in Australia, the method produced suspended sediment yields consistent with other Australian observations. The majority of the sediment delivered to the lake comes via the lower Wollondilly River (251 À49 +264 kt a À1 ), with lesser contributions from the Kowmung (114 À30 +62 kt a À1 ) and Cox's (63 À14 +81 kt a À1 ) rivers. Despite uncertainty in the shape of the rating curve at high flows, days with the largest flow clearly transport most of the suspended sediment delivered to the reservoir over the long term, with 40-85% of the total load being transported in <1% of the time. This bootstrap-based method could be applied to the calculation of other constituent fluxes in rivers where discrete sampling of constituent concentration serves as the principal data.Citation: Rustomji, P., and S. N. Wilkinson (2008), Applying bootstrap resampling to quantify uncertainty in fluvial suspended sediment loads estimated using rating curves, Water Resour. Res., 44, W09434,

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Suspended sediment transport regime in a debris-flow gully on Vancouver Island, British Columbia

Cited by 76 publications

References 16 publications

Reliability of sediment rating curves for a deciduous forest watershed in Iran

Reliability of sediment rating curves for a deciduous forest watershed in Iran

Dye staining and excavation of a lateral preferential flow network

Applying bootstrap resampling to quantify uncertainty in fluvial suspended sediment loads estimated using rating curves

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