Spatial Distribution of Bedload Transport Velocity Using an Acoustic Doppler Current Profiler

2002 ◽  
Author(s):  
Colin D. Rennie ◽  
Robert G. Millar
Keyword(s):  
Spatial Distribution ◽  
Acoustic Doppler Current Profiler ◽  
Bedload Transport ◽  
Transport Velocity ◽  
Current Profiler

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.

scholarly journals Calculated Potential Bedload Versus Real Transported Sands along the Guadiana River Estuary (Spain–Portugal)

2019 ◽  
Vol 7 (11) ◽  
pp. 393
Author(s):  
Juan A. Morales ◽  
Claudio Lozano ◽  
Mouncef Sedrati
Keyword(s):  
Bottom Water ◽  
River Estuary ◽  
Acoustic Doppler Current Profiler ◽  
Bedload Transport ◽  
Cohesive Sediments ◽  
Coastal System ◽  
Deep Channel ◽  
Current Profiler ◽  
Comparison Of The Results ◽  
Guadiana Estuary

The Guadiana estuary is a coastal system located in the southwest of the Iberian Peninsula and is the natural border between Portugal and Spain. It is a rock-bounded estuary which extends along more than 40 km and is characterized by a semidiurnal mesotidal regime. This paper represents an approach to the bedload transport across two flow sections located in the fluvial and marine domains. In the fluvial profile, the most frequent bedform is the plane bed. In the marine area the bed of the deep channel is composed of well-sorted sand, while a lateral bar displays partially cohesive sediments with dominant fine sands in a matrix of clayey silts. Data were acquired during spring and neap tides. Near-bottom water velocities were registered by an acoustic Doppler current profiler (ADCP). Density and bed rugosity were determined in sediment samples. These data were employed using Bagnold’s equation (1963) to quantify the potential bedload (Qb). Further, real bedload values (Sb) were obtained by using Poliakoff traps. The comparison of the results of Qb under both ebb and flood conditions demonstrated a clear river-to-sea net transport in both sectors. The values of Sb were lower than those of Qb in every condition. The sand input across the fluvial estuary cannot supply the potential bedload in the lower domain of the channel, thereby causing a deficit that explains this lack of agreement between potential and real transport.

scholarly journals Hydroacoustic and Pressure Turbulence Analysis for the Assessment of Fish Presence and Behavior Upstream of a Vertical Trash Rack at a Run-of-River Hydropower Plant

2018 ◽  
Vol 8 (10) ◽  
pp. 1723 ◽  
Author(s):  
Marc Schmidt ◽  
Jeffrey Tuhtan ◽  
Martin Schletterer
Keyword(s):  
Spatial Distribution ◽  
Flow Characteristics ◽  
Acoustic Doppler Current Profiler ◽  
Hydropower Plant ◽  
Hydro Power ◽  
Starting Point ◽  
Current Profiler ◽  
Spatial Estimates ◽  
Flow Turbulence ◽  
Turbulence Analysis

The spatial distribution of fish upstream of a vertical trash rack was investigated at the hydropower plant Kirchbichl in the alpine River Inn (Tyrol, Austria). The objective of the research project “FIDET” was to establish a non-invasive methodology to study fish presence and flow characteristics at large hydro power sites. A new monitoring approach was developed combining hydroacoustic observations of fish locations with multivariate hydrodynamic data. This was accomplished by utilizing complementary observations from multiple underwater sensor technologies: First, an array of echosounders were deployed at a fixed cross-section upstream of the trash rack for long-term monitoring. Afterwards, detailed underwater surveys with “acoustic cameras” (DIDSON and ARIS) revealed that the spatial distributions of fish in front of the trash rack were highly heterogeneous. The spatial distribution of the flow field was assessed via the time-averaged velocity fields from acoustic Doppler current profiler (ADCP). Finally, a custom pressure-based flow turbulence probe was developed, providing spatial estimates of flow turbulence immediately upstream of the trash rack. The significant contribution of this work is to provide a multi-modal monitoring approach incorporating both fish position data and hydrodynamic information. This forms the starting point for a future objective, namely to create an automated, sonar-based detection and control systems to assist and monitor fish protection operations in near real-time.

scholarly journals Calibration of Acoustic Doppler Current Profiler Apparent Bedload Velocity to Bedload Transport Rate

2017 ◽  
pp. 209-233 ◽  
Author(s):  
Colin D. Rennie ◽  
Damià Vericat ◽  
Richard D. Williams ◽  
James Brasington ◽  
Murray Hicks
Keyword(s):  
Acoustic Doppler Current Profiler ◽  
Bedload Transport ◽  
Transport Rate ◽  
Current Profiler

Klamath River Water Quality and Acoustic Doppler Current Profiler Data from Link River Dam to Keno Dam, 2007

2008 ◽  
Author(s):  
Annett B. Sullivan ◽  
Michael L. Deas ◽  
Jessica Asbill ◽  
Julie D. Kirshtein ◽  
Kenna D. Butler ◽  
...  
Keyword(s):  
Water Quality ◽  
River Water ◽  
Acoustic Doppler Current Profiler ◽  
River Water Quality ◽  
Klamath River ◽  
Current Profiler ◽  
Profiler Data
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