Contrasting suspended sediment export in two small agricultural catchments: Cross-influence of hydrological behaviour and landscape degradation or stream bank management

2018 ◽  
Vol 29 (5) ◽  
pp. 1385-1396 ◽  
Author(s):  
Amphone Vongvixay ◽  
Catherine Grimaldi ◽  
Rémi Dupas ◽  
Ophélie Fovet ◽  
François Birgand ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Agricultural Catchments ◽  
Landscape Degradation ◽  
Bank Management ◽  
Stream Bank ◽  
Sediment Export

scholarly journals Quantifying total suspended sediment export from the Burdekin River catchment using the loads regression estimator tool

2012 ◽  
Vol 48 (4) ◽  
Author(s):  
Petra M. Kuhnert ◽  
Brent L. Henderson ◽  
Stephen E. Lewis ◽  
Zoe T. Bainbridge ◽  
Scott N. Wilkinson ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Regression Estimator ◽  
Total Suspended Sediment ◽  
River Catchment ◽  
Sediment Export

scholarly journals Temperature signal in suspended sediment export from an Alpine catchment

2018 ◽  
Vol 22 (1) ◽  
pp. 509-528 ◽  
Author(s):  
Anna Costa ◽  
Peter Molnar ◽  
Laura Stutenbecker ◽  
Maarten Bakker ◽  
Tiago A. Silva ◽  
...  
Keyword(s):  
Snow Cover ◽  
Suspended Sediment ◽  
Air Temperature ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration ◽  
Sediment Sources ◽  
Free Surfaces ◽  
Ice Melt ◽  
Alpine Catchments ◽  
Sediment Export

Abstract. Suspended sediment export from large Alpine catchments (> 1000 km2) over decadal timescales is sensitive to a number of factors, including long-term variations in climate, the activation–deactivation of different sediment sources (proglacial areas, hillslopes, etc.), transport through the fluvial system, and potential anthropogenic impacts on the sediment flux (e.g. through impoundments and flow regulation). Here, we report on a marked increase in suspended sediment concentrations observed near the outlet of the upper Rhône River Basin in the mid-1980s. This increase coincides with a statistically significant step-like increase in basin-wide mean air temperature. We explore the possible explanations of the suspended sediment rise in terms of changes in water discharge (transport capacity), and the activation of different potential sources of fine sediment (sediment supply) in the catchment by hydroclimatic forcing. Time series of precipitation and temperature-driven snowmelt, snow cover, and ice melt simulated with a spatially distributed degree-day model, together with erosive rainfall on snow-free surfaces, are tested to explore possible reasons for the rise in suspended sediment concentration. We show that the abrupt change in air temperature reduced snow cover and the contribution of snowmelt, and enhanced ice melt. The results of statistical tests show that the onset of increased ice melt was likely to play a dominant role in the suspended sediment concentration rise in the mid-1980s. Temperature-driven enhanced melting of glaciers, which cover about 10 % of the catchment surface, can increase suspended sediment yields through an increased contribution of sediment-rich glacial meltwater, increased sediment availability due to glacier recession, and increased runoff from sediment-rich proglacial areas. The reduced extent and duration of snow cover in the catchment are also potential contributors to the rise in suspended sediment concentration through hillslope erosion by rainfall on snow-free surfaces, and increased meltwater production on snow-free glacier surfaces. Despite the rise in air temperature, changes in mean discharge in the mid-1980s were not statistically significant, and their interpretation is complicated by hydropower reservoir management and the flushing operations at intakes. Overall, the results show that to explain changes in suspended sediment transport from large Alpine catchments it is necessary to include an understanding of the multitude of sediment sources involved together with the hydroclimatic conditioning of their activation (e.g. changes in precipitation, runoff, air temperature). In addition, this study points out that climate signals in suspended sediment dynamics may be visible even in highly regulated and human-impacted systems. This is particularly relevant for quantifying climate change and hydropower impacts on streamflow and sediment budgets in Alpine catchments.

scholarly journals Effect of riparian vegetation on stream bank stability in small agricultural catchments

CATENA ◽  
2019 ◽  
Vol 172 ◽  
pp. 87-96 ◽  
Author(s):  
Dominika Krzeminska ◽  
Tjibbe Kerkhof ◽  
Kamilla Skaalsveen ◽  
Jannes Stolte
Keyword(s):  
Riparian Vegetation ◽  
Bank Stability ◽  
Agricultural Catchments ◽  
Stream Bank

Modelling spatial and temporal variations of annual suspended sediment yields from small agricultural catchments

2018 ◽  
Vol 619-620 ◽  
pp. 672-684 ◽  
Author(s):  
A. Rymszewicz ◽  
M. Bruen ◽  
J.J. O'Sullivan ◽  
J.N. Turner ◽  
D.M. Lawler ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
Sediment Yields ◽  
Agricultural Catchments

Suspended sediment and discharge relationships to identify bank degradation as a main sediment source on small agricultural catchments

2007 ◽  
Vol 21 (21) ◽  
pp. 2923-2933 ◽  
Author(s):  
J. Lefrançois ◽  
C. Grimaldi ◽  
C. Gascuel-Odoux ◽  
N. Gilliet
Keyword(s):  
Suspended Sediment ◽  
Sediment Source ◽  
Agricultural Catchments
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