scholarly journals Spatial variability in river bed porosity determined by nuclear density gauging: A case study from a French gravel‐bed river

Sedimentology ◽  
2021 ◽  
Author(s):  
Mina Tabesh ◽  
Stefan Vollmer ◽  
Holger Schüttrumpf ◽  
Roy M. Frings
Keyword(s):  
Spatial Variability ◽  
Nuclear Density ◽  
Gravel Bed ◽  
Bed Porosity ◽  
River Bed ◽  
Gravel Bed River

scholarly journals Entrainment and deposition of boulders in a gravel bed river

2021 ◽  
Author(s):  
Pascal Allemand ◽  
Eric Lajeunesse ◽  
Olivier Devauchelle ◽  
Vincent Langlois
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
West Indies ◽  
River Discharge ◽  
Bedload Transport ◽  
Transport Time ◽  
Gravel Bed ◽  
River Bed ◽  
Effective Transport ◽  
Gravel Bed River

Abstract. Rivers transports coarse sediment (gravel, cobbles, or boulder) as bedload. During a flood, when the discharge is high enough, the sediment grains move by rolling and bouncing on the river bed. Measuring bedload transport in the field is notoriously difficult. Here, we propose a new method to characterize bedload transport by floods. Using a drone equipped with a high resolution camera, we recorded yearly images of a bar of the Vieux-Habitants river, a gravel-bed river located on Basse-Terre Island (Guadeloupe, French West Indies). These images, combined with high frequency measurements of the river discharge, allow us to monitor the evolution of the population of boulders on the river bed. Based on this dataset, we estimate the smallest discharge that can move the boulders, and calculate the effective transport time of the river. We find that transport occurs about 10 hours per year. When plotted as a function of this effective transport time, likelihood of a given boulder remaining at the same location decreases exponentially, with an effective residence time of 17 hours. We then propose a rough estimate of the average number of boulders that the river carries every year.

Regulated flushing in a gravel-bed river for channel habitat maintenance: A Trinity River fisheries case study

1987 ◽  
Vol 11 (4) ◽  
pp. 479-493 ◽  
Author(s):  
R. Wayne Nelson ◽  
John R. Dwyer ◽  
Wendy E. Greenberg
Keyword(s):  
Gravel Bed ◽  
Trinity River ◽  
Gravel Bed River

MONITORING UNSTEADY STREAMFLOW-STAGE HYSTERESIS BEHAVIOR OF A GRAVEL-BED RIVER

2018 ◽  
Vol 74 (4) ◽  
pp. I_313-I_318
Author(s):  
Mohamad Basel AL SAWAF ◽  
Kiyosi KAWANISI ◽  
Mochammad Meddy DANIAL
Keyword(s):  
Hysteresis Behavior ◽  
Gravel Bed ◽  
Gravel Bed River

scholarly journals Estimates of resource transfer via winged adult insects from the hyporheic zone in a gravel‐bed river

2021 ◽  
Author(s):  
Mirza A. T. M. Tanvir Rahman ◽  
Junjiro N. Negishi ◽  
Takumi Akasaka ◽  
Futoshi Nakamura
Keyword(s):  
Hyporheic Zone ◽  
Resource Transfer ◽  
Gravel Bed ◽  
Gravel Bed River
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