Estimating bedload transport in a large sand–gravel bed river from direct sampling, dune tracking and empirical formulas

Geomorphology ◽  
2012 ◽  
Vol 179 ◽  
pp. 40-57 ◽  
Author(s):  
Nicolas Claude ◽  
Stéphane Rodrigues ◽  
Vincent Bustillo ◽  
Jean-Gabriel Bréhéret ◽  
Jean-Jacques Macaire ◽  
...  
Keyword(s):  
Bedload Transport ◽  
Empirical Formulas ◽  
Gravel Bed ◽  
Direct Sampling ◽  
Gravel Bed River

scholarly journals Relevance of acoustic methods to quantify bedload transport and bedform dynamics in a large sandy-gravel-bed river

2021 ◽  
Vol 9 (3) ◽  
pp. 423-444
Author(s):  
Jules Le Guern ◽  
Stéphane Rodrigues ◽  
Thomas Geay ◽  
Sébastien Zanker ◽  
Alexandre Hauet ◽  
...  
Keyword(s):  
Measurement Techniques ◽  
Reference Method ◽  
Acoustic Doppler Current Profiler ◽  
Accurate Method ◽  
Calibration Procedure ◽  
Bedload Transport ◽  
Empirical Formulas ◽  
Sandy Gravel ◽  
Gravel Bed ◽  
Gravel Bed River

Abstract. Despite the inherent difficulties in quantifying its value, bedload transport is essential for understanding fluvial systems. In this study, we assessed different indirect bedload measurement techniques with a reference direct bedload measurement in a reach of a large sandy-gravel-bed river. An acoustic Doppler current profiler (aDcp), the dune tracking method (DTM) and hydrophone measurement techniques were used to determine bedload transport rates by using calibration with the reference method or by using empirical formulas. This study is the first work which attempted to use a hydrophone to quantify bedload rates in a large sandy-gravel-bed river. Results show that the hydrophone is the most efficient and accurate method for determining bedload fluxes in the Loire River. Although further work is needed to identify the parameters controlling self-generated sediment noise, the calibration procedure adopted in this study allows a satisfactory estimation of bedload transport rates. Moreover, aDcp and hydrophone measurement techniques are accurate enough to quantify bedload variations associated with dune migration.

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.

Insights into bedload transport processes of a large regulated gravel-bed river

2017 ◽  
Vol 43 (2) ◽  
pp. 514-523 ◽  
Author(s):  
Marcel Liedermann ◽  
Philipp Gmeiner ◽  
Andrea Kreisler ◽  
Michael Tritthart ◽  
Helmut Habersack
Keyword(s):  
Bedload Transport ◽  
Transport Processes ◽  
Gravel Bed ◽  
Gravel Bed River

scholarly journals Relevance of acoustic methods to quantify bedload transport and bedform dynamics in large sandy-gravel bed river

2020 ◽  
Author(s):  
Jules Le Guern ◽  
Stéphane Rodrigues ◽  
Thomas Geay ◽  
Sébastien Zanker ◽  
Alexandre Hauet ◽  
...  
Keyword(s):  
Measurement Techniques ◽  
Reference Method ◽  
Acoustic Doppler Current Profiler ◽  
Accurate Method ◽  
Bedload Transport ◽  
Fluvial Systems ◽  
Sandy Gravel ◽  
Gravel Bed ◽  
Current Profiler ◽  
Gravel Bed River

Abstract. Despite the inherent difficulties to quantify its value, bedload transport is essential to understand fluvial systems. In this study, we assessed different indirect bedload measurement techniques with a reference direct bedload measurement in a section of a large sandy-gravel bed river. Acoustic Doppler Current Profiler (aDcp), Dune Tracking Method (DTM) and hydrophone measurement techniques were used to determine bedload transport rates using calibration with the reference method or using empirical formula. Results show that the hydrophone is the most efficient and accurate method to determine bedload flux in the Loire River. Even though parameters controlling self-generated noise of sediments still need to better understood, the calibration determined in this study allows a good approximation of bedload transport rates. Moreover, aDcp and hydrophone measurement techniques are both able to continuously measure bedload transport associated to bedform migration.

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