Sediment export by water from an agricultural catchment in the Loam Belt of central Belgium

Steegen, An; Govers, Gérard; Nachtergaele, Jeroen; Takken, Ingrid; Beuselinck, L; Poesen, Jean

doi:10.1016/s0169-555x(99)00108-7

Cited by 152 publications

(140 citation statements)

References 14 publications

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“…The model simulates that, integrated over the period of simulation, about 10 % of the total rainfall does result in surface runoff. This is consistent with field observations in the study area, where an average of 8 % was reported by Steegen et al (2000Steegen et al ( , 2001. In contrast, the simulated temporal variability in runoff is high, and events with a larger recurrence interval, i.e.…”

Section: Rainfall/runoffsupporting

confidence: 90%

“…In one such study, which was carried out in small agricultural catchments in the Belgian loess belt, Steegen et al (2000) measured sediment delivery over a 3-year period in two first-order streams. The authors found that a single event contributed to more than 40 % of the total sediment delivery during the observation period and that the sum of rare and extreme events accounts for 46 %.…”

Section: Frequency and Magnitude Of Erosion And Delivery Of Soil Consmentioning

confidence: 99%

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Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

2017

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Abstract.Over the last few decades, soil erosion and carbon redistribution modelling has received a lot of attention due to large uncertainties and conflicting results. For a physically based representation of event dynamics, coupled soil and carbon erosion models have been developed. However, there is a lack of research utilizing models which physically represent preferential erosion and transport of different carbon fractions (i.e. mineral bound carbon, carbon encapsulated by aggregates and particulate organic carbon). Furthermore, most of the models that have a high temporal resolution are applied to relatively short time series (< 10 yr −1 ), which might not cover the episodic nature of soil erosion. We applied the event-based multi-class sediment transport (MCST) model to a 100-year time series of rainfall observation. The study area was a small agricultural catchment (3 ha) located in the Belgium loess belt about 15 km southwest of Leuven, with a rolling topography of slopes up to 14 %. Our modelling analysis indicates (i) that interrill erosion is a selective process which entrains primary particles, while (ii) rill erosion is non-selective and entrains aggregates, (iii) that particulate organic matter is predominantly encapsulated in aggregates, and (iv) that the export enrichment in carbon is highest during events dominated by interrill erosion and decreases with event size.

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Section: Rainfall/runoffsupporting

confidence: 90%

Section: Frequency and Magnitude Of Erosion And Delivery Of Soil Consmentioning

confidence: 99%

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

2017

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“…This index partly compensates for the fact that SSC increases with Q and can be interpreted as a measure of the efficiency of a runoff event to transport sediment. EEI (g s l -2 ) was calculated as (Steegen et al 2000):…”

Section: Suspended Sediment Concentrationsmentioning

confidence: 99%

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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“…Glendell and Brazier, 2014;Steegen et al, 2000;Thompson et al, 2013). Likewise, studies have sought to characterise the nature of P losses from headwater agricultural catchments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Dominant mechanisms for the delivery of fine sediment and phosphorus to fluvial networks draining grassland dominated headwater catchments

Perks

Owen

Benskin

et al. 2015

Science of The Total Environment

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. (2015) 'Dominant mechanisms for the delivery of ne sediment and phosphorus to uvial networks draining grassland dominated headwater catchments.', Science of the total environment., 523 . pp. 178-190. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Sediment export by water from an agricultural catchment in the Loam Belt of central Belgium

Cited by 152 publications

References 14 publications

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

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

Dominant mechanisms for the delivery of fine sediment and phosphorus to fluvial networks draining grassland dominated headwater catchments

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