Les crues de l'Isère à Grenoble et l'aménagement actuel des digues

Vivian, Huguette

doi:10.3406/rga.1969.3391

Cited by 10 publications

(9 citation statements)

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“…The River Isère's natural flow regime is nivo‐glacial with an average flow of 178 m 3 s ′1 at Grenoble (where river flows have been monitored throughout our 80 year study period) and high sediment transport (Vivian, ; Didier, ). Table provides a summary of the hydrological information for the river basin upstream of the Arc confluence at Albertville, downstream of the confluence at Montmélian and further downstream at Grenoble.…”

Section: The Study Area and Reachmentioning

confidence: 99%

Biomorphodynamics of alternate bars in a channelized, regulated river: An integrated historical and modelling analysis

Serlet

Gurnell

Zolezzi

et al. 2018

Earth Surf Processes Landf

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The development of alternate bars in channelized rivers can be explained theoretically as an instability of the riverbed when the active channel width to depth ratio exceeds a threshold. However, the development of a vegetation cover on the alternate bars of some channelized rivers and its interactions with bar morphology have not been investigated in detail. Our study focused on the co‐evolution of alternate bars and vegetation along a 33 km reach of the Isère River, France. We analysed historical information to investigate the development of alternate bars and their colonization by vegetation within a straightened, embanked river subject to flow regulation, sediment mining, and vegetation management. Over an 80 year period, bar density decreased, bar length increased, and bar mobility slowed. Vegetation encroachment across bar surfaces accompanied these temporal changes and, once established, vegetation cover persisted, shifting the overall system from an unvegetated to a vegetated dynamic equilibrium state. The unvegetated morphodynamics of the impressively regular sequence of alternate bars that developed in the Isère following channelization is consistent with previous theoretical morphodynamic work. However, the apparent triggering dynamics of vegetation colonization needs to be investigated, based on complex biophysical instability processes. If instability related to vegetation colonization is confirmed, further work needs to focus on the relevance of initial conditions for this instability, and on related feedback effects such as how the morphodynamics of bare‐sediment alternate bars may have affected vegetation development and, in turn, how vegetation has created a new dynamic equilibrium state. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: The Study Area and Reachmentioning

confidence: 99%

Biomorphodynamics of alternate bars in a channelized, regulated river: An integrated historical and modelling analysis

Serlet

Gurnell

Zolezzi

et al. 2018

Earth Surf Processes Landf

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“…-1 observed during the last great flood in 1859 [11]. The ten-year extreme event is generally estimated at around 760 m 3 sec -1 , the fifty-year event at 1000 m 3 sec -1 , and the hundred-year event at over 1600 m 3 sec -1 [38,; other studies have given slightly higher figures [2,40].…”

Section: Secmentioning

confidence: 99%

The results of 10 years of daily observations of the flux of suspended matter in one of the main watercourses in the European Alps: The Isere at Grenoble (France)

Dumas

2007

Comptes Rendus. Géoscience

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“…4. The sliding velocity is measured from a cavity that opens behind a bedrock bump using a 'cavitometer' designed by Vivian (1975). The cavitometer consists of a bicycle wheel with a circumference of 1.55 m attached to a 1.30 m long articulated arm that is fixed to the rock (Fig.…”

Section: Methodsmentioning

confidence: 99%

Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area

Vincent

Moreau

2016

J. Glaciol.

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ABSTRACT. The subglacial observatory beneath the Argentière glacier provides a rare opportunity to study the interactions between glacier sliding velocity and subglacial runoff. The sliding velocity has been monitored in this cavity almost continuously since 1997 and the resulting data indicate a decrease in annual sliding velocities over the last two decades. We found close relationships between annual surface velocity, sliding velocity and ice thickness. These relationships indicate that the ice-flow velocity changes do not depend on subglacial water runoff changes at the annual timescale. The seasonal magnitudes of sliding also show a decrease over the last two decades. At the seasonal timescale, sliding velocity increases before or simultaneously with the large runoff increase in May, indicating a distributed drainage system. Conversely, at the end of the melt season, sliding velocity continues to decrease after the runoff returns to low winter values. The simultaneous increases of runoff and sliding velocity occur mainly before the spring transition. Later, sliding velocity generally appears not to be related to water inputs coming from the surface, except for some large accelerations after midAugust that are always associated with periods of rapidly increasing water inputs to the subglacial drainage system.

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Les crues de l'Isère à Grenoble et l'aménagement actuel des digues

Cited by 10 publications

References 0 publications

Biomorphodynamics of alternate bars in a channelized, regulated river: An integrated historical and modelling analysis

Biomorphodynamics of alternate bars in a channelized, regulated river: An integrated historical and modelling analysis

The results of 10 years of daily observations of the flux of suspended matter in one of the main watercourses in the European Alps: The Isere at Grenoble (France)

Sliding velocity fluctuations and subglacial hydrology over the last two decades on Argentière glacier, Mont Blanc area

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