De Alluviale Gronden van de Maas, de Roer, en de Geul in Limburg (Alluvial Soils of the Rivers Maas, Roer, and Geul)

Wilde, S. A.; Tanzer, Ch.

doi:10.2136/sssaj1965.03615995002900060004x

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“…The planforms of these streams differ from more rounded planforms of alluvial meandering streams, e.g. de Roer in The Netherlands (Figure (e)) (Wilde and Tanzer, ). Although palaeohydrological information on the identified streams in peatlands is lacking, we suggest that it is highly likely that oblique aggradation caused the planform formation, similar to the Narew River.…”

Section: Discussionmentioning

confidence: 88%

Oblique aggradation: a novel explanation for sinuosity of low‐energy streams in peat‐filled valley systems

Candel

Makaske

Storms

et al. 2017

Earth Surf Processes Landf

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Low-energy streams in peatlands often have a high sinuosity. However, it is unknown how this sinuous planform formed, since lateral migration of the channel is hindered by relatively erosion-resistant banks. We present a conceptual model of Holocene morphodynamic evolution of a stream in a peat-filled valley, based on a palaeohydrological reconstruction. Coring, ground-penetrating radar (GPR) data, and 14 C and OSL dating were used for the reconstruction. We found that the stream planform is partly inherited from the Late-Glacial topography, reflecting stream morphology prior to peat growth in the valley. Most importantly, we show that aggrading streams in a peat-filled valley combine vertical aggradation with lateral displacement caused by attraction to the sandy valley sides, which are more erodible than the co-evally aggrading valley-fill. Owing to this oblique aggradation in combination with floodplain widening, the stream becomes stretched out as channel reaches may alternately aggrade along opposed valley sides, resulting in increased sinuosity over time. Hence, highly sinuous planforms can form in peat-filled valleys without the traditional morphodynamics of alluvial bed lateral migration. Improved understanding of the evolution of streams provides inspiration for stream restoration.

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Section: Discussionmentioning

confidence: 88%