Sediment Transport During an Outburst from Glacier De Tsidjiore Nouve, Switzerland, 16–19 June 1981

Beecroft, Ian

doi:10.3189/s0022143000005244

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…One aspect of proglacial stream suspended sediment dynamics to receive particular attention is the occurrence of large short-term pulses of sediment. These have been variously associated with short-term increases in stream discharge resulting from rainstorms (Bezinge, 1987), the bursting of intraglacial water pockets (Gurnell, 1982;Beecroft, 1983) or the emptying of icedammed lakes , but may also be unrelated to short-term increases in discharge (fastrem, 1975;Collins, 1979;Bogen, 1980;Gurnell, 1982;Humphrey et al, 1986). In the last instance, such pulses may be related to the reorganization of the subglacial hydrological system (Collins, 1979; and could accompany short periods of enhanced basal motion (Gurnell, 1982;Gurnell and Warburton, 1990).…”

Section: Previous Workmentioning

confidence: 99%

Links Between Proglacial Stream Suspended Sediment Dynamics, Glacier Hydrology and Glacier Motion at Midtdalsbreen, Norway

1996

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Two-hourly suspended sediment concentration variations observed during the summer of 1987 in the proglacial stream draining Midtdalsbreen, Norway are modelled using multiple regression and time series techniques. Suspended sediment fluctuations are influenced by stream discharge variations, diurnal hysteresis effects, medium-term sediment supply and transport variations and the recent suspended sediment concentration history of the stream. They do not appear to be influenced by seasonal exhaustion or rainfall variations. Possible reasons for this are discussed. Large positive residuals from the fitted models are major pulses of suspended sediment unrelated to discharge variations; these sediment flushes correlate with periods of enhanced glacier motion. They cannot be explained by enhanced sediment production by subglacial erosion, but are probably due to the tapping of subglacially stored sediment during sudden changes in the hydraulics and/or configuration of the subglacial hydrological system. Seasonal changes in the lag between glacier motion peaks and suspended sediment flushes suggest that the subglacial hydrological system evolves over the summer from a distributed to a more channelized configuration.

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Section: Previous Workmentioning

confidence: 99%

Links Between Proglacial Stream Suspended Sediment Dynamics, Glacier Hydrology and Glacier Motion at Midtdalsbreen, Norway

1996

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“…Outburst floods often result in disproportionate amounts of suspended sediments which increases the density of the water (Snorrason et al, 2002;Church, 1972). Discharge from outburst floods are typically on the order of 100 − 1000 m 3 s −1 (Walder and Costa, 1996, Table 1) and can contain suspended sediment concentrations SSC of up to 70.7 g L −1 (Beecroft, 1983;Old et al, 2005) with a lower threshold for hyper-concentrated sediment concentrations of 400 g L −1 (Maizels, 1997).…”

Section: Outburst Floodsmentioning

confidence: 99%

Modeling saline fluid flow through subglacial ice-walled channels and the impact of density on fluid flux

Jenson

Skidmore

Beem

et al. 2023

Preprint

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Abstract. Subglacial hydrological systems have impacts on ice dynamics, as well as, nutrient and sediment transport. There has been extensive effort to understand the dynamics of subglacial drainage through numerical modeling. These models, however, have focused on freshwater in warm ice and neglected the consideration of fluid chemistry such as salts. Saline fluid can exist in cold-based glacier systems where freshwater cannot and understanding the routing of saline fluid is important for understanding geochemical and microbiological processes in these saline cryospheric habitats. A better characterization of such terrestrial environments may provide insight to analogous systems on other planetary bodies. We present a model of channelized drainage from a hypersaline subglacial lake and highlight the impact of salinity on melt rates in an ice-walled channel. The model results show that channel walls grow more quickly when fluid contains higher salt concentrations which lead to higher discharge rates. We show this is due to a higher density fluid moving through a gravitational potential. This model provides a framework to assess the impact of fluid chemistry and properties on the spatial and temporal variation of fluid flux.

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“…This paper considers the potential of detailed field calibrations of sediment traps in melt-water intake structures within a hydro-electricity scheme for estimating sediment yield. Previously data from sediment traps associated with hydro-electric power schemes have been used both for estimating sediment transport (Wold and Østrem, 1979; Lauffer and Sommer, 1982) and as an approximate means of estimating bed-load transport during a melt-water outburst from the Tsidjiore Nouve basin, Switzerland (Beecroft, 1983). In this paper no specific particle size is used to distinguish suspended sediment load from bed load.…”

Section: Introductionmentioning

confidence: 99%

The Management of Sediment Transported by Glacial Melt-Water Streams and its Significance for the Estimation of Sediment Yield

Bezinge¹,

Clark²,

Gurnell

et al. 1989

Ann. Glaciol.

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This paper describes the calibration of sediment traps in melt-water intake structures of the Grande Dixence hydro-electricity scheme for the purpose of generating medium-term estimates of suspended sediment and bed load transport by pro-glacial streams. The frequency of emptying/purging of sediment from traps in 17 glacier basins in the Val d'Herens is combined with their design sediment volume to provide first approximations of the mean annual volume of sediment purged. This is followed by more detailed consideration of II years of records from three of the basins, to investigate mean seasonal and inter-annual patterns of purging. The difficulties of relating sediment purging to sediment transport are considered. A sediment calibration strategy based on 2 years of turbidity records, hand sampling of suspended sediment concentration, and monitoring of the accumulation of sediment in sediment traps is proposed for one of the glacier basins, and is checked using hourly and 4 h suspended sediment observations from two further ablation seasons. The calibration is applied to 10 years of discharge and purge records to establish estimates of mean seasonal and inter-annual patterns of suspended sediment and bed-load transport.

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Sediment Transport During an Outburst from Glacier De Tsidjiore Nouve, Switzerland, 16–19 June 1981

Cited by 8 publications

References 10 publications

Links Between Proglacial Stream Suspended Sediment Dynamics, Glacier Hydrology and Glacier Motion at Midtdalsbreen, Norway

Links Between Proglacial Stream Suspended Sediment Dynamics, Glacier Hydrology and Glacier Motion at Midtdalsbreen, Norway

Modeling saline fluid flow through subglacial ice-walled channels and the impact of density on fluid flux

The Management of Sediment Transported by Glacial Melt-Water Streams and its Significance for the Estimation of Sediment Yield

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