Modelling and testing spatially distributed sediment budgets to relate erosion processes to sediment yields

Wilkinson, Scott N.; Prosser, Ian P.; Rustomji, Paul; Read, Arthur

doi:10.1016/j.envsoft.2008.09.006

Cited by 143 publications

(98 citation statements)

References 55 publications

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“…Similar findings have also been reported for other locations by Walling (1988), Church & Slaymaker (1989), Lane et al (1997), Terajima et al (1996), Sichingabula (1998), Asselman (2000), Horowitz (2003), Sadeghi et al (2008a) and Wilkinson et al (2009). The poor correlation between SSC and Q data can be attributed to: variation in the temporal rainfall intensity distribution; suspended sediment supply from internal sources (i.e.…”

Section: Fitting the Ssc-q Relationshipsupporting

confidence: 73%

“…Comprehensive studies aim at a better understanding of the rainfall-soil erosion-runoff-sediment system as a whole, by integrating both natural and anthropogenic aspects at different temporal and spatial scales. This finally leads to a proper estimate of sediment yield needed for water management and erosion control structures, and river morphological and evaluation studies (Kothyari et al, 1997;Lana-Renault et al, 2007;Sadeghi et al, 2008b;Wilkinson et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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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: Fitting the Ssc-q Relationshipsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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

Sadeghi

Pari

2010

Hydrological Sciences Journal

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“…Our simplified approach focuses on the primary inputs and outputs in a section of a stream according to Wilkinson et al (2009), where the primary production process corresponds to the contribution of slope and channel erosion in the upper parts of the basin (Strahler order 1). Our main purpose was to provide a basis for comparative analyses of sediment retention in the tributary rivers of the Mompós 20 Depression for the different hydropower expansion scenarios; therefore, we do not provide a comprehensive description of the other components of the channel sediment balance, such as sediment production by lateral migration of the channel, or bank overflow events and sediment deposition.…”

Section: Sediment Trappingmentioning

confidence: 99%

Large-scale impacts of hydropower development on the Mompós Depression wetlands, Colombia

Angarita¹,

Wickel²,

Sieber³

et al. 2017

Preprint

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A number of large hydropower dams are currently under development or in an advanced stage of planning in the Magdalena River basin, Colombia, spelling uncertainty for the Mompós Depression wetlands, one of the largest wetland systems in South America. Annual large-scale inundation of floodplains and associated wetlands regulates water-, nutrient-, and sediment cycles, which in turn sustain a wealth of ecological processes and ecosystem services, including critical food 15 supplies. In this study, we present a comparative analysis of the potential effects of hydropower expansion to meet projected electricity requirements by 2050, in terms of 1) basin-level implications of cumulative changes in streamflow regime, sediment trapping, and loss of river connectivity, and 2) the impact of upstream regulation on the hydrologic dynamics of the Mompós Depression wetlands at a monthly to decadal scale. To this end, we developed an enhancement of the Water Evaluation and Planning system (WEAP) that allows resolution of the Mompós Depression floodplains water balance at a 20 medium scale (~1000 to 10 000 km 2 ) and evaluation of the potential impacts of upstream water management practices. Our results indicate that potential additional impacts of new hydropower infrastructure with respect to baseline conditions can range up to one order of magnitude between scenarios that are comparable in terms of energy capacity. Fragmentation of connectivity corridors between lowland floodplains and upstream spawning habitats and reduction of sediment loads show the greatest impacts, with potential reductions of up to 97.6 and 80%, respectively, from pre-dam conditions. In some 25 development scenarios, the amount of water regulated and withheld by upstream infrastructure is of similar magnitude to existing fluxes involved in the episodic inundation of the floodplain during dry periods and, thus, can also induce substantial changes in floodplain seasonal dynamics of average-to-dry years in some areas of the Mompós Depression.

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“…Several investigations have presented empirical approaches relating sediment yield to catchment area, combined, or not, with other factors, such as basin shape, topography, runoff, lithology and vegetation cover (Walling, 1983;Church & Slaymaker, 1989;Verstraeten et al, 2003;de Vente et al, 2005;Minear & Kondolf, 2009). Others have presented distributed or semi-distributed hydro-sedimentological models such as WEPP (Flanagan et al, 1995;Ramsankaram et al, 2009), EUROSEM (Morgan et al, 1998;Mati et al, 2006), SWAT (Chen & Mackay, 2004;Rostamian et al, 2008), HIDROSED (de Araújo & Knight, 2005;de Araújo, 2007), WATEM/SEDEM (Verstraeten et al, 2007;de Vente et al, 2008) and SEDNET (Prosser et al, 2001;Wilkinson et al, 2009), for the assessment of soil erosion and sediment yield at the basin scale. However, none of the above-mentioned empirical approaches and hydro-sedimentological models deals with the HdRN problem, as in the case of large basins of the Brazilian semi-arid region.…”

Section: Fig 1 Upper Jaguaribe Basin-ujb (24 600 Kmmentioning

confidence: 99%

Sediment redistribution due to a dense reservoir network in a large semi-arid Brazilian basin

Neto

Wiegand

Araújo

2011

Hydrological Sciences Journal

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This paper investigates for a 25-year period the sediment distribution in a semi-arid Brazilian basin (2 × 10 4 km 2 ) with a network containing more than 4000 surface reservoirs. The methodology is based on rating curves and fitted parameters derived from field data. The results showed that suspended load corresponded to 70% of the total sediment yield (148 t km -2 year -1 ). The relatively low contribution of the suspended load (compared with other semi-arid regions) was attributed to the impact of the numerous upstream reservoirs, which retained 235 t km -2 year -1 . The micro (<1 hm 3 ), small (1-10 hm 3 ), medium-sized (10-50 hm 3 ), and large or strategic (>50 hm 3 ) reservoirs responded to, respectively, 5, 17, 30 and 48% of the total sediment retention by the reservoir network. This indicates that retention in the non-strategic reservoirs has a positive impact on water availability, since siltation of the strategic reservoirs would be expected to more than double if only such reservoirs existed.Key words reservoir network; siltation; sediment yield; semi-arid watershed; Brazil Redistribution des sédiments due à un réseau dense de réservoirs dans un grand bassin versant semi-aride du BrésilRésumé Cet article étudie sur une période de 25 ans la distribution des sédiments dans un bassin versant semi-aride du Brésil (2 10 4 km 2 ) qui est équipé d'un réseau de plus de 4000 réservoirs de surface. La méthodologie est basée sur les courbes de tarage et les paramètres ajustés provenant des données du terrain. Les résultats montrent que la charge en suspension correspond à 70% de la production totale de sédiments (148 t km -2 an -1 ). La contribution relativement faible de la charge en suspension (par rapport aux autres régions semi-arides) est attribuée à l'impact des nombreux réservoirs en amont, qui retiennent 235 t km -2 an -1 . Les réservoirs très petits (<1 hm 3 ), petits (1−10 hm 3 ), moyens (10−50 hm 3 ), et grands ou stratégiques (>50 hm 3 ) représentent, respectivement, 5, 17, 30 et 48% de la rétention totale de sédiments par le réseau de réservoirs. Cela indique que la rétention dans les réservoirs non-stratégiques a un impact positif sur la disponibilité de l'eau, puisque la sedimentation dans ces réservoirs stratégiques pourrait plus que doubler si eux seuls existaient.

show abstract

Modelling and testing spatially distributed sediment budgets to relate erosion processes to sediment yields

Cited by 143 publications

References 55 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

Large-scale impacts of hydropower development on the Mompós Depression wetlands, Colombia

Sediment redistribution due to a dense reservoir network in a large semi-arid Brazilian basin

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