Event sequence and sediment exhaustion in the lower Panuco Basin, Mexico

Hudson, Paul F.

doi:10.1016/s0341-8162(02)00145-5

Cited by 112 publications

(115 citation statements)

References 21 publications

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“…Many studies report hysteretic Q-SSC responses during flood events, explaining why a single Q-SSC relationship is subjected to large scatter (e.g. Williams, 1989;Hudson 2003;Moliere et al 2004;Alexandrov et al 2007). Hysteretic Q-SSC responses were also noted in this study (Fig.5).…”

Section: Suspended Sediment Concentrationssupporting

confidence: 71%

“…A decrease in sediment supply due to the depletion of available material and/or the development of a better vegetative cover have been reported by various authors (e.g. Walling and Webb 1982;Hudson 2003;Moliere et al 2004;Alexandrov et al 2007). …”

Section: Suspended Sediment Concentrationsmentioning

confidence: 74%

“…Slattery and Burt 1997). Also Hudson (2003) reports a relatively greater importance of sandy bed material towards the end of the rainy season as a result of sediment depletion.…”

Section: Variation In Suspended Grain-size Distributionsmentioning

confidence: 96%

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Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

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Purpose The Ethiopian highlands are a fragile environment, characterized by steep slopes, intense rainfall, a sparse vegetation cover and the occurrence of flash floods. Although important efforts have been made to mitigate the ongoing soil erosion and land degradation problems, the sediment dynamics at medium-sized catchment scale (100-10,000 km²)are not fully understood. Therefore, this study aims to provide a better of sediment export processes and the importance of flash flood events in semi-arid tropical catchments. 2Methods Measuring campaigns were conducted in 10 subcatchments of the Geba, a tributary of the Tekeze, representative of the northern Ethiopian highlands. During 2 to 4 rainy seasons, the rivers were sampled for their suspended sediment concentration (SSC) and runoff discharge.Results and discussion Variations in SSC and sediment grain-size distribution indicate changes in sediment supply during the rainy season, due to the depletion of readily available sediments and the development of a vegetation cover.Also during flood events, changes in sediment supply are observed. Sediment yields (i.e. 497-6,543 t km -2 yr -1 ) are higher than suggested by previous studies and correlate with rainfall depth. The majority of sediment export occurs during a few short but intense flash floods. No clear effect of implemented soil and water conservation measures could be detected in the sediment yields of the catchments.Conclusions Sediment export rates in the Ethiopian highlands are high, are characterized by important changes in sediment supply and are mainly controlled by the occurrence and magnitude of flash flood events. Mitigation measures to reduce sediment yield at the catchment scale should therefore not only focus on the reduction of hillslope erosion rates, but also on the magnitude of these floods.

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Section: Suspended Sediment Concentrationssupporting

confidence: 71%

Section: Suspended Sediment Concentrationsmentioning

confidence: 74%

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Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

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“…linear, quadratic, inverse, cubic, power, logarithmic, compound, S-shape, growth and exponential, were established for the entire data collected during the study period. Various methods of sub-dividing the suspended sediment data set were taken into account with five periods: whole duration; sand mining (before, during, after and without sand mining operation), monthly, seasonal and periodical bases (Walling, 1977b;Walling & Webb, 1983;Lane et al, 1997;Sichingabula, 1998;Phillips et al, 1999;Horowitz, 2003;Rovira & Batalla, 2006), rising and falling stages of storm hydrographs (Asselman, 2000;Hudson, 2003;Sadeghi et al, 2006Sadeghi et al, , 2008b and threshold discharge (Thomas, 1988;Schmidt & Morche, 2006) to improve the reliability of Q-SSC relationships. Also, the fact that the concentration of suspended sediment and discharge generated during different conditions are not related in a unique manner was considered (Seeger et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

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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“…[4] Whilst discharge and suspended sediment concentration are frequently correlated at the broadest level (hence the use of the rating curve method), many processes operating within catchments mean that considerable scatter is inevi-tably present in any bivariate relationship between these two variables [e.g., Walling and Webb, 1988;Hudson, 2003;Syvitski et al, 2000]. 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.…”

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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Event sequence and sediment exhaustion in the lower Panuco Basin, Mexico

Cited by 112 publications

References 21 publications

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

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

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

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