Bedload infilling and depositional patterns in chute cutoffs channels of a gravel‐bed river: The Ain River, France

Szewczyk, Léo; Grimaud, Jean‐Louis; Cojan, Isabelle; Piégay, Hervé

doi:10.1002/esp.5260

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…These observations point to a cutoff event between 550 and 650 yrs cal. AD, which isolated the eastern part of the channel, likely through the formation of a sand plug blocking the entrance 47 . This cutoff was followed by the lateral migration of the Seine River towards the west, which enabled the Carolingian pirogue to become stranded after ca.…”

Section: Resultsmentioning

confidence: 99%

Lateral river erosion impacts the preservation of Neolithic enclosures in alluvial plains

Grimaud,

Gouge,

Huyghe

et al. 2023

Sci Rep

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Situating prehistoric sites in their past environment helps us to understand their functionality and the organization of early sedentary human societies. However, this is a challenge as the natural environment constantly evolves through time and erases these constructions, especially along riverbanks, thus biasing the archaeological record. This study introduces a reassessment of the paleo-landscape evolution around the Neolithic enclosures at the Noyen-sur-Seine site based on new field observations as well as the synthesis of (un)published and new radiocarbon dating. Contrary to the initial hypothesis, our results show that the Noyen enclosures were not built along a Neolithic Seine River: the nearby channels were active in the Middle Age and Early Modern periods. Therefore, the results show that the enclosures were originally much larger: only a fraction that survived river erosion (lateral migration rates up to 2–3 m yr−1 estimated during the nineteenth century) has been preserved. Instead, an abandoned Mesolithic Seine River served as a natural delimitation of the SE part of the Neolithic enclosures. These results indicate that Neolithic enclosures in alluvial settings are often only partly preserved and that societies from that period lived farther away from active rivers than originally thought, where they were protected from floods.

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Section: Resultsmentioning

confidence: 99%

Lateral river erosion impacts the preservation of Neolithic enclosures in alluvial plains

Grimaud,

Gouge,

Huyghe

et al. 2023

Sci Rep

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show abstract

“…In fluvial system, avulsion period scales with the time for aggradation to elevate the channel above the levees by one channel depth (Jerolmack & Mohrig, 2007). Aggradation and formation of channel plugs can however occur rapidly (tens of years) (e.g., Szewczyk et al., 2022) and force avulsion with limited overbank deposition at the scale of the floodplain. Such dynamics of rapid switches compared to aggradation may explain how reworking can be well expressed in alluvial systems (Figure 7c).…”

Section: Discussionmentioning

confidence: 99%

Preservation and Completeness of Fluvial Meandering Deposits Influenced by Channel Motions and Overbank Sedimentation

et al. 2022

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Assessing the contribution of geomorphic processes to the (non‐)preservation of sedimentary deposits is necessary to account for potential bias in measured accumulation rates in the stratigraphic record. In this study, a series of numerical simulations of fluvial meandering successions is performed using FLUMY, a model of channel motions and sedimentary facies deposition. We develop tools to measure non‐deposition (stasis S) and reworking (R) of previously deposited sediment between iterations, which are both generators of hiatuses in the sedimentary record. We then compare S and R with measurements of accumulation rates and completeness (C). Results show that combining measurements of both topographic and facies changes allows for a better record of surface evolution than measuring topographies only. Accumulation rate dependence on measurement time span allows distinguishing between two regimes. The first one (anti‐persistent) is characteristic of channel avulsion and compensational stacking until the whole domain is visited by overbank deposition, corresponding to the visitation timescale Tv. In the second regime (persistent), reworking by channel migration is the remaining active process until the whole system has aggraded one channel depth, corresponding to the compensation timescale Tc. Based on these results, we propose a new simple formulation based on stasis and reworking to estimate average completeness.

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“…These approaches have yielded empirical patterns that link hydraulics and geomorphic alterations in the cutoff process [26][27][28] . Natural chute cutoffs often progress concurrently with the original and new channels until the formation of oxbows, a process termed bifurcation and confluence, which constitutes the most recognized conceptual model of chute cutoff 11 .…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

Qiao,

Yang,

Hao

et al. 2024

Preprint

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Chute cutoff represents a significant geomorphic event in the evolution of meandering rivers. Following the chute cutoff, channel adjustments occur rapidly. Therefore, investigating the interaction between the flow dynamics and channel morphology is relatively challenging. However, numerical simulations provide enhanced insights into the hydrodynamic characteristics of artificial chute cutoff. In the initial year of an artificial chute cutoff evolution in the Ningxia section of the Yellow River, we collected data on the channel topography and three-dimensional flow velocity. These measurements were utilized to calibrate the established two dimensional mathematical model and explore the impacts of different hydrological conditions on the hydrodynamics of the chute channel after the artificial cutoff. The simulation results revealed the complexity of the two-dimensional flow field within the artificial chute cutoff characterized by several regions of flow separation and recirculation zones, which was related to chute channel topography and boundary conditions. These recirculation zones varied with the inlet flow. Across the three discharges, most of the flow remained concentrated in the main channel. At higher discharges increasing the water levels, the floodplain became inundated, and a shear layer between the main channel and floodplain emerged. This study presented a detailed depiction of the flow structure within artificial chute cutoff under diverse river geomorphological and hydrological conditions. This research can bridge knowledge gaps regarding chute cutoffs in the upper reaches of the Yellow River, contributing to the improvement of conceptual models concerning chute cutoff phenomena.

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Bedload infilling and depositional patterns in chute cutoffs channels of a gravel‐bed river: The Ain River, France

Cited by 6 publications

References 49 publications

Lateral river erosion impacts the preservation of Neolithic enclosures in alluvial plains

Lateral river erosion impacts the preservation of Neolithic enclosures in alluvial plains

Preservation and Completeness of Fluvial Meandering Deposits Influenced by Channel Motions and Overbank Sedimentation

Numerical modeling of two-dimensional hydrodynamics in an artificial chute cutoff under different hydrologic conditions

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