Modelling the long‐term fluvial erosion of the River Somme during the last million years

Gargani, Julien; Stab, Olivier; Cojan, Isabelle; Brulhet, Jacques

doi:10.1111/j.1365-3121.2006.00671.x

Cited by 12 publications

(13 citation statements)

References 38 publications

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“…These are the transformation of artificial climatic records, mimicking the Milankovitch insolation model (e.g. Veldkamp and Van den Berg, 1993;Veldkamp and Van Dijke, 1998;Veldkamp and Tebbens, 2001;Gargani et al, 2006), or the transformation of palaeoclimate proxy data as recorded in ice cores or marine sediments Veldkamp and Tebbens, 2001). Veldkamp and Van den Berg (1993) and Veldkamp and Van Dijke (1998) use the argument that discharge in rivers during glacial episodes is low as a result of the southward shift of the North Atlantic depression tracks, causing a drier more continental climate and vice versa high during interglacial periods.…”

Section: Discharge Reconstructionmentioning

confidence: 99%

“…2001). Gargani et al (2006) take into consideration the influence of vegetation on the water balance of a system, arguing that during interglacial periods when vegetation cover is dense and evapotranspiration is high effective discharge is likely to be lower than during glacial periods. As different climatic regimes have different vegetation cover, the correlation between an orbital tuned record or d 18 O signal and annual discharge is likely to be nonlinear.…”

Section: Discharge Reconstructionmentioning

confidence: 99%

“…Examples of this are studies of the Allier/Loire system (Veldkamp and Van Dijke, 1998), the Meuse catchment (e.g. Tebbens and Veldkamp, 2001;Bogaart, 2003), the Aller Valley , the Cam Gill Beck (Coulthard et al, 2005) and the Somme (Gargani et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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The construction of a palaeodischarge time series for use in a study of fluvial system development of the Middle to Late Pleistocene Upper Thames

Stemerdink¹,

Maddy²,

Bridgland³

et al. 2010

J Quaternary Science

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2010. The construction of a palaeodischarge time series for use in a study of fluvial system development of the Middle to Late Pleistocene Upper Thames.ABSTRACT: Recently many studies have attempted to model fluvial system development over a variety of geographical and temporal scales. It is generally recognised that one of the main problems, especially in studies over longer timescales (>100 ka), is the reconstruction of a robust palaeodischarge time series. Over such extended timescales discharge can only be reconstructed using proxy data, i.e. either field-based (sediment) palaeodischarge estimates or transformation of reconstructed palaeoclimate data series (e.g. ice core data), with only the latter method allowing the reconstruction of a continuous time series. In this study of the Upper Thames catchment, UK, we have developed a new palaeodischarge time series. A sea surface temperature record (ODP 980) from the North Atlantic (off the west coast of Ireland) is used as a proxy for precipitation across the Upper Thames catchment. A vegetation filter, based on pollen data, is then applied to this precipitation record in order to create a runoff model. Finally, this runoff model is transformed to a discharge model via the use of a climate change function which attempts to reflect probable changes in the frequency and magnitude of discharge events. Using our new palaeodischarge model, we present output from the FLUVER2 model of longitudinal profile development for the Middle to Late Pleistocene Upper Thames Valley. This model simulates the possible timing and magnitude of sediment aggradation/degradation events on the floodplain as well as the timing of floodplain abandonment due to tectonic uplift, resulting in terrace formation.

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Section: Discharge Reconstructionmentioning

confidence: 99%

Section: Discharge Reconstructionmentioning

confidence: 99%

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The construction of a palaeodischarge time series for use in a study of fluvial system development of the Middle to Late Pleistocene Upper Thames

Stemerdink¹,

Maddy²,

Bridgland³

et al. 2010

J Quaternary Science

View full text Add to dashboard Cite

show abstract

“…Model boundary conditions in these simulations (water and sediment supply, tectonics, and sea level) were based on idealised hypothetical time series with a maximum temporal resolution of c. 10 ky, often scaled by astronomically driven insolation or oxygen isotope curves. Interpretation of model results focused on simulated terrace sequences, including qualitative comparison with observations (e.g., Veldkamp, 1992;Gargani et al, 2006). Such numerical experiments have provided insight into controls on the preservation of climate signals within alluvial deposits and into lag times between climate change and fluvial responses.…”

Section: Introductionmentioning

confidence: 99%

“…Several previous studies have examined alluvial systems over Quaternary timescales using simple river long profile models (e.g., Veldkamp, 1992;Tebbens and Veldkamp, 2000;Veldkamp and van Dijke, 2000;Hancock and Anderson, 2002;Gargani et al, 2006). Model boundary conditions in these simulations (water and sediment supply, tectonics, and sea level) were based on idealised hypothetical time series with a maximum temporal resolution of c. 10 ky, often scaled by astronomically driven insolation or oxygen isotope curves.…”

Section: Introductionmentioning

confidence: 99%

Quantitative assessment of landform equifinality and palaeoenvironmental reconstruction using geomorphic models

Nicholas

Quine

2010

Geomorphology

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Predicting reach‐specific properties of fluvial terraces to guide future fieldwork. A case study for the Late Quaternary River Allier (France) with the FLUVER2 model

Veldkamp

Schoorl

Viveen

2016

Earth Surf Processes Landf

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Numerical models have not yet systematically been used to predict properties of fluvial terrace records in order to guide fieldwork and sampling. This paper explores the potential of the longitudinal profile model FLUVER2 to predict testable field properties of the relatively well‐studied, Late Quaternary Allier system in France. For the Allier terraces an overlapping 14C and U‐series chronology as well as a record of 10Be erosion rates exist. The FLUVER2 modelling exercise is focused on the last 50 ka of the upper Allier reach because for this location and period the constraints of the available dating techniques are tightest. A systematic calibration based on terrace occurrence and thicknesses was done using three internal parameters related to (1) the sediment erodibility; (2) the sediment transport distance; and (3) the sediment supply derived from the surrounding landscape. As external model inputs, the best available, reconstructed, tectonic, climatic and base‐level data were used. Calibrated model outputs demonstrate a plausible match with the existing fluvial record. Validation of model output was done by comparing the modelled and measured timing of aggradation and incision phases for the three locations. The modelled range of landscape erosion rates showed a reasonably good match with existing erosion rate estimates derived from 10Be measurements of fluvial sands. The quasi‐validated model simulation was subsequently used to make new testable predictions about the timing and location of aggradation and erosion phases for three locations along the Allier river. The validated simulations predict that along the Allier, reach‐specific dynamics of incision and aggradation, related to the variations in sediment supply by major tributaries, cause relevant differences in the local fluvial terrace stratigraphy. Copyright © 2016 John Wiley & Sons, Ltd.

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Modelling the long‐term fluvial erosion of the River Somme during the last million years

Abstract: International audienc

Cited by 12 publications

References 38 publications

The construction of a palaeodischarge time series for use in a study of fluvial system development of the Middle to Late Pleistocene Upper Thames

The construction of a palaeodischarge time series for use in a study of fluvial system development of the Middle to Late Pleistocene Upper Thames

Quantitative assessment of landform equifinality and palaeoenvironmental reconstruction using geomorphic models

Predicting reach‐specific properties of fluvial terraces to guide future fieldwork. A case study for the Late Quaternary River Allier (France) with the FLUVER2 model

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