Cutoffs galore!: occurrence and causes of multiple cutoffs on a meandering river

Hooke, Janet

doi:10.1016/j.geomorph.2003.12.006

Cited by 157 publications

(142 citation statements)

References 33 publications

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“…Comparison with a heavily grazed and unfenced portion of floodplain on the neighbouring River Bollin, with very similar conditions, indicates much less growth (see air photo in Hooke, 2004). The changes, if widespread, have implications for occurrence of habitats and also for river channel processes, and therefore, for the European Water Framework Directive (WFD).…”

Section: Resultsmentioning

confidence: 96%

Evidence of increase in woody vegetation in a river corridor, Northwest England, 1984–2007

Hooke

Chen

2015

Journal of Maps

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Based on observations on rivers in England over a 30-year period, it was hypothesised that the extent of woody vegetation in riparian areas has increased in many locations. Methods to map and measure changes in vegetation cover from aerial photographs were developed and tested on a 5 km reach of the River Dane in Northwest England. Riparian vegetation was divided into seven classes, and these were mapped from aerial photographs of four dates, 1984, 1996, 2001 and 2007. The results indicate an increase from 9% woody vegetation cover in the river corridor in 1984 to 32% cover in 2007, with a 40-fold increase in areas of mature woody vegetation. The results have implications for river processes, because of effects on bank erosion and sediment supply, and for land management policies, with grazing control hypothesised to be a major cause of the changes.

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Section: Resultsmentioning

confidence: 96%

Evidence of increase in woody vegetation in a river corridor, Northwest England, 1984–2007

Hooke

Chen

2015

Journal of Maps

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“…On the River Dane, Hooke (2007a) demonstrated that the migrating bends are led by erosion. Hooke (2004 and2007b) recently underlined the apparent opposition of two theories concerning meander dynamics: on the one hand, the theory of equilibrium supposing that the meander evolution is mainly related to external factors, and on the other hand, the theory of self-organization and nonlinearity of meandering rivers, that could explain temporal and spatial evolution of fluvial form. The first part of the study conducted on Beni's meanders has shown that large floods do not imply meander cut-offs; once the critical state in the form of the meander is reached, clusters of cut-offs occur independently of the intensity of the flood (Gautier et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Channel and floodplain sediment dynamics in a reach of the tropical meandering Rio Beni (Bolivian Amazonia)

Gautier

Brunstein

Vauchel³

et al. 2010

Earth Surf Processes Landf

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The study investigates interactions, water and sediment exchanges, between a rapidly migrating meander and its associated floodplain at fine temporal and spatial scales. The Beni River, an Amazonian free meandering river, makes the transition between Andean ranges and Amazonian lowlands. For the period 2002-2006, an assemblage of tools and methods (water and sediment discharges, topometric and bathymetric surveys, sedimentation rate estimations from unsupported 210 Pb and sediment trapping system) was used to jointly analyse the influence on the sediment budget of external factors (mainly water and sediment discharge) and the inherent behaviour of the system. The main issue addressed is the investigation of the complex relationship between 'morphological conditioning' of fluvial landform and process. The first part of the study was undertaken with the aim of linking erosion-deposition in an active meander with water and sediment fluxes. The three inter-annual evolutions are characterized by very unequal sediment budgets; the first two intervals underwent predominant erosion, and the latter slight accumulation. Digital elevation models, evaluated for the active meander, demonstrate that sedimentation on the point bar depends more on external factors than erosion of the concave bank, which fluctuates slightly. The second part of the study, focusing on water and sediment exchanges between active bend and floodplain, examines the respective parts played by overbank flow and by an abandoned channel on the diffusion and sequestration of sediment. The association of short-and long-term estimation of sedimentation rates suggests that floodplain construction is associated with two different processes and rhythms of sediment transportation. Finally, a sediment budget is proposed for the Beni River in the upper part of the Amazonian lowlands.

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“…The natural neck cut o of meander M6 that took place in 2006 shortened the study reach by 827 m. Local sinuosity was preserved at relatively high values (decreasing from 2.9 to 2.1). Hooke [52] tested Unauthenticated Download Date | 5/10/18 2:05 PM a possible explanation for cut o s on the Bollin River. The case of a natural cut o on the Morava River supports the statement that cut o occurred as a consequence of high ow (during the ood with Q50 discharge).…”

Section: Variables Controlling Planform Changesmentioning

confidence: 99%

Response of lateral channel dynamics of a lowland meanderingriver to engineering-derived adjustments - an example of theMorava River (Czech Republic)

Ondruch

Máčka

2015

Open Geosciences

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Freely meandering (quasi)natural reaches of lowland rivers represent a rare phenomenon in Central Europe. Increasing attention is currently being paid to the dynamics of quasi-natural (arti cially in uenced) meandering rivers as this attention represents the basic prerequisite for the development of appropriate restoration strategies on regulated rivers. This study focused on a 5.5 km long reach of the Morava River in the Strážnické Pomoraví region, Czech Republic that is characterised by quasi-natural evolution after substantial engineering adjustments were made in the rst decades of the twentieth century. Based on Geographic Information Systems (GIS) analysis of aerial photographs, the spatio-temporal dynamics of bank erosion and accretion rates were quantitatively described and variables that control channel migration rates were identi ed. High rates of lateral shifts were localised in high sinuosity segments (sinuosity 1.17-2.37), whereas segments with very low rates were straight or formed into slightly curved bends (sinuosity 1.05-1.18). As a key factor, engineering works that in uenced local river bed slope and induced a dramatic increase in bank erosion rates were identi ed. River engineering works induced a dramatic increase in bank erosion rate (2.19 m/year for 1938-53 and 1.47 m/year for 1953-63). An interval of approximately 25 years was needed before the erosion rates dropped back to values documented before river regulation (0.35-1.09 m/year for 1841-1938). Other important controlling variables included radius of curvature, frequency and magnitude of oods and, locally, river bank material properties and oodplain land cover.

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Cutoffs galore!: occurrence and causes of multiple cutoffs on a meandering river

Cited by 157 publications

References 33 publications

Evidence of increase in woody vegetation in a river corridor, Northwest England, 1984–2007

Evidence of increase in woody vegetation in a river corridor, Northwest England, 1984–2007

Channel and floodplain sediment dynamics in a reach of the tropical meandering Rio Beni (Bolivian Amazonia)

Response of lateral channel dynamics of a lowland meanderingriver to engineering-derived adjustments - an example of theMorava River (Czech Republic)

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