Sediment sources, spatiotemporal variability and rates of fluvial bedload transport in glacier-connected steep mountain valleys in western Norway (Erdalen and Bødalen drainage basins)

Beylich, Achim A.; Laute, Katja

doi:10.1016/j.geomorph.2014.10.018

Cited by 47 publications

(44 citation statements)

References 41 publications

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“…During large floods, particularly ablation-precipitation events, total bedload flux was from 59% to 77% [31,34]. The effect of weather and extreme events on the modern development of the relief of the valley floor and channel was also repeatedly emphasised for proglacial rivers [7][8][9]13,17,20,[22][23][24][25]38,[63][64][65][66].…”

Section: Discussionmentioning

confidence: 99%

“…The rivers can develop complex multiple channel patterns, often at a transitional stage [10,11,38]. Scarce detailed research also showed the importance of local factors on the spatial distribution, extent, and temporal frequency of streambank erosion, which as a consequence causes problems in the comparison of obtained results [8,13,22,64,71]. According to Palmer et al [72], large variations at individual sites and in annual rates suggest that between the banks, erosion rates may be confounded by the timing and magnitude of discharge events, storage of sediments within the channel system, and the remobilization of eroded material.…”

Section: Discussionmentioning

confidence: 99%

“…Annual and inter-seasonal changes in the channel are subject to fluctuations depending on the temporal scale, but also show spatial variability; therefore, the term and location of measurement of the intensity of streambank erosion is of strategic importance, particularly if the analysis concerns long-term changes [72]. An optimal solution involves continuous measurements with an appropriate spatial distribution along the cascade system of the catchment, and especially homogenous and low-order catchments [9,13,22,32,33,36,73,74]. The problem in the determination of the intensity of streamline erosion in gravel-bed rivers also concerns the selection of the measurement technique, which further determines the measurement unit.…”

Section: Discussionmentioning

confidence: 99%

“…The term, frequency, and duration of the measurement periods can affect the results obtained considerably and make their comparison difficult; therefore, standardisation of measurement methods is advisable. It is also of key importance to investigate the river regime and the course of deposit transport in the channel from source to sink thoroughly [7,13,22,32,33,35,36,73].…”

Section: Discussionmentioning

confidence: 99%

“…This results in changes in the rate of sediment transport, which can be locally accompanied by both lateral migration and/or deepening of the channel [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Meteorological Patterns on the Intensity of Streambank Erosion in a Proglacial Gravel-Bed River (Spitsbergen)

Kociuba

Janicki

2018

Water

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Lower parts of proglacial rivers are commonly assumed to be characterised by a multiannual aggradation trend, and streambank erosion is considered to occur rarely and locally. In the years 2009-2013, detailed measurements of channel processes were performed in the Scott River (SW Spitsbergen). More than 60% of its surface area (10 km 2 ) occupies non-glaciated valleys. Since the end of the Little Ice Age, the Scott Glacier has been subject to intensive retreat, resulting in the expansion of the terminoglacial and paraglacial zones. In this area, the Scott River develops an alluvial valley with a proglacial river, which has led to a comparatively low rate of fluvial transport, dominance of suspension over bedload, and the occurrence of various channel patterns. Measurements, performed in the lower course of the valley in two fixed cross-sections of the Scott River channel, document variable annual tendencies with a prevalence of scour over deposition processes in the channel bottom. The balance of scour and fill also differs in particular measurement cross-sections and during the summer season. The maximum erosion indices (1.7 m 2 ) were related to single periods of floods with snow-glacier melt and rainfall origin. The contribution of streambank erosion was usually lower than that of deep erosion both in the annual cycle and during extreme events. The channel-widening index also suggests variable annual (from −1 m to +1 m) and inter-annual tendencies. During a three-day flood from August 2013, in a measurement profile at the mouth of the river, the NNW bank was laterally shifted by as much as 3 m. Annual and inter-seasonal indices of total channel erosion, however, show that changes in the channel-bottom morphology are equalised relatively fast, and in terms of balance the changes usually do not exceed 0.5% of a cross section's area.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…This results in changes in the rate of sediment transport, which can be locally accompanied by both lateral migration and/or deepening of the channel [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Meteorological Patterns on the Intensity of Streambank Erosion in a Proglacial Gravel-Bed River (Spitsbergen)

Kociuba

Janicki

2018

Water

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Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Rickenmann

2018

Water Resources Research

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Previous measurements of bed load transport in gravel bed streams revealed a large temporal and spatial variability of bed load transport rates. Using an impact plate geophone system, continuous bed load transport measurements were made during 6 years in two mountain streams in Austria. The two streams have a snow‐melt and glacier‐melt dominated hydrologic regime resulting in frequent transport activity during the summer half year. Periods of days to weeks were identified which are associated with approximately constant Shields values that indicate quasi‐stable bed conditions. Between these stable periods, the position of the bed load transport function varied while its steepness remained approximately constant. For integration time scales of several hours to 1 day, the fluctuations in bed load transport decreased and the correlation between bed load transport and water discharge increased. For integration times of about 70–100 days, bed load transport is determined by discharge or shear stress to within a factor of about 2, relative to the 6 year mean level. Bed load texture increased with increasing mean flow strength and mean transport intensity. Weak and predominantly clockwise daily hysteresis of bed load transport was found for the first half of the summer period.

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Source to sink reconstruction of a Holocene Fjord‐infill: Depositional patterns, suspended sediment yields, wind‐induced circulation patterns and trapping efficiency for Lake Strynevatnet, inner Nordfjord, Norway

Storms

Beylich²,

Hansen

et al. 2020

The Depositional Record

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This paper reconstructs the sedimentation volumes and patterns, suspended sediment yields, wind-induced circulation patterns and sediment trapping efficiency of Lake Strynevatnet, western Norway as an integrated source to sink system. The lake became deglaciated ca 11 ky cal bp, with glacio-isostatic uplift isolating the basin from the nearby fjord (Nordfjord) ca 9.2 ky cal bp. Based on geophysical data collected in 2010, the upper 15-20 m of Holocene sediment accumulation in the lake was mapped. A sediment body in the centre of the lake indicates a depositional mechanism dominated by suspension sedimentation. The source of this sediment is associated with the adjacent glaciated catchments westward of the lake. Three seismic units were identified based on seismic facies generating an evolutionary model utilizing three depositional units (U1, U2 and U3), in which unit U2 represents the Storegga tsunami event. Unit U3 is further divided into three subunits; U3a, U3b and U3c based on their spatial continuity and subtle downlapping and onlapping relationships. The degree to which wind conditions could have affected the lake depositional patterns were studied utilizing an open-source coupled hydrodynamic and sediment transport model. The results show that fluvial discharge alone is incapable of generating a circulation pattern in the lake currents. Suspended sediment concentrations in the lake are highest for strong winds. Modelled sediment accumulation on the lake floor shows that mild or absent winds lead to a proximal to distal sediment thickness trend, while strong winds result in uniform sediment thickness. Based on this it is argued that the thickness trends of seismic subunits U3a-c are related to a variable palaeowind climate. As such, seismic data of lake infills, in combination with numerical modelling, may provide valuable palaeoclimatic information on wind patterns. K E Y W O R D SGlacier-fed rivers, hydrodynamic modelling, palaeowind, sediment yield, sedimentation patterns, seismic stratigraphy, suspended sediment concentration, trapping efficiency 472 | STORMS eT al.

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Sediment sources, spatiotemporal variability and rates of fluvial bedload transport in glacier-connected steep mountain valleys in western Norway (Erdalen and Bødalen drainage basins)

Cited by 47 publications

References 41 publications

Effect of Meteorological Patterns on the Intensity of Streambank Erosion in a Proglacial Gravel-Bed River (Spitsbergen)

Effect of Meteorological Patterns on the Intensity of Streambank Erosion in a Proglacial Gravel-Bed River (Spitsbergen)

Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Source to sink reconstruction of a Holocene Fjord‐infill: Depositional patterns, suspended sediment yields, wind‐induced circulation patterns and trapping efficiency for Lake Strynevatnet, inner Nordfjord, Norway

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