scholarly journals A Study of the Location of the Entrance of a Fishway in a Regulated River with CFD and ADCP

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Anders G. Andersson ◽  
Dan-Erik Lindberg ◽  
Elianne M. Lindmark ◽  
Kjell Leonardsson ◽  
Patrik Andreasson ◽  
...  
Keyword(s):  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Fish Passage ◽  
Hydropower Plant ◽  
Regulated River ◽  
Unstable Flow ◽  
River Bed ◽  
Current Profiler ◽  
Tailrace Tunnel ◽  
Made In

Simulation-driven design with computational fluid dynamics has been used to evaluate the flow downstream of a hydropower plant with regards to upstream migrating fish. Field measurements with an Acoustic Doppler Current Profiler were performed, and the measurements were used to validate the simulations. The measurements indicate a more unstable flow than the simulations, and the tailrace jet from the turbines is stronger in the simulations. A fishway entrance was included in the simulations, and the subsequent attraction water was evaluated for two positions and two angles of the entrance at different turbine discharges. Results show that both positions are viable and that a position where the flow from the fishway does not have to compete with the flow from the power plant will generate superior attraction water. Simulations were also performed for further downstream where the flow from the turbines meets the old river bed which is the current fish passage for upstream migrating fish. A modification of the old river bed was made in the model as one scenario to generate better attraction water. This considerably increases the attraction water although it cannot compete with the flow from the tailrace tunnel.

scholarly journals A Modified Beam-to-Earth Transformation to Measure Short-Wavelength Internal Waves with an Acoustic Doppler Current Profiler

2005 ◽  
Vol 22 (5) ◽  
pp. 583-591 ◽  
Author(s):  
A. Scotti ◽  
B. Butman ◽  
R. C. Beardsley ◽  
P. Soupy Alexander ◽  
S. Anderson
Keyword(s):  
Internal Waves ◽  
Short Wavelength ◽  
Acoustic Doppler Current Profiler ◽  
Propagation Direction ◽  
Horizontal Distance ◽  
Massachusetts Bay ◽  
Backscatter Intensity ◽  
Current Profiler ◽  
Adcp Observations ◽  
Made In

Abstract The algorithm used to transform velocity signals from beam coordinates to earth coordinates in an acoustic Doppler current profiler (ADCP) relies on the assumption that the currents are uniform over the horizontal distance separating the beams. This condition may be violated by (nonlinear) internal waves, which can have wavelengths as small as 100–200 m. In this case, the standard algorithm combines velocities measured at different phases of a wave and produces horizontal velocities that increasingly differ from true velocities with distance from the ADCP. Observations made in Massachusetts Bay show that currents measured with a bottom-mounted upward-looking ADCP during periods when short-wavelength internal waves are present differ significantly from currents measured by point current meters, except very close to the instrument. These periods are flagged with high error velocities by the standard ADCP algorithm. In this paper measurements from the four spatially diverging beams and the backscatter intensity signal are used to calculate the propagation direction and celerity of the internal waves. Once this information is known, a modified beam-to-earth transformation that combines appropriately lagged beam measurements can be used to obtain current estimates in earth coordinates that compare well with pointwise measurements.

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.

Hydropower Intake-induced Fish Entrainment Risk Zone Analysis

2020 ◽  
Author(s):  
Mat Langford ◽  
David Z. Zhu ◽  
Alf Leake ◽  
Steven Cooke
Keyword(s):  
Potential Flow ◽  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Dynamics Model ◽  
Risk Zone ◽  
Operational Conditions ◽  
Environmentally Sustainable ◽  
Computational Fluid Dynamics Model ◽  
Flow Solution ◽  
Current Profiler

Evaluating the impacts of hydropower intake operations on upstream aquatic habitat is important for the development of environmentally sustainable hydropower and flood protection. A computational fluid dynamics model was used to simulate the flow field in the forebay of a high dam, Mica Dam in British Columbia, Canada. The model use to evaluate the upstream hydraulics under various operational conditions and reservoir levels. This model, which was verified by a novel means of collected acoustic Doppler current profiler field measurements, highlights how appropriate intake selection may limit the volume of the forebay occupied by the entrainment risk zone. Additionally, a potential flow solution was applied to predict the velocity field induced by the intakes and the limitation of the potential flow solution was assessed.

scholarly journals Morphological Investigation of a Critical Reach of the Upper Hungarian Danube

2017 ◽  
Author(s):  
Gergely T. Török ◽  
Sándor Baranya
Keyword(s):  
Human Impacts ◽  
Morphological Changes ◽  
Acoustic Doppler Current Profiler ◽  
River Regulation ◽  
Danube River ◽  
Hydropower Plant ◽  
Essential Information ◽  
Inland Navigation ◽  
Current Profiler ◽  
The Stability

The aim of this study is to analyze the current morphological changes and to predict the potential future trends of a critical reach of the upper Hungarian Danube River. In this section of the river the morphological features have undergone significant changes, mainly due to human impacts, such as the construction of the Gabcikovo hydropower plant close to the Slovakian border, or the river regulation measures with groin fields along the Hungarian reach. The morphological changes of the river inherently led to river management issues, e.g. the developed gravel bars caused problems for inland navigation. In order to reveal and understand the characteristic morphodynamic processes, results from past bed geometry surveys were assessed, moreover, extensive field measurement campaigns were carried out, including bathymetry survey, flow survey with fixed and moving Acoustic Doppler Current Profiler (ADCP), bed material sampling and bedload measurements. The utilization of up-to-date field data processing methods provided essential information on the current dominant morphological processes and finally, suggestions were made on the stability of the river planform.

Numerical Assessment on Wave Energy Resources in Coastal Waters of Northeastern Taiwan

2014 ◽  
Author(s):  
Shiaw-Yih Tzang ◽  
Yung-Lung Chen ◽  
Tai-Wen Hsu ◽  
Da-Wei Chen ◽  
Chun-Chih Wang ◽  
...  
Keyword(s):  
Wave Energy ◽  
Coastal Waters ◽  
Model Simulation ◽  
Surface Wind ◽  
Acoustic Doppler Current Profiler ◽  
Field Measurements ◽  
Test Site ◽  
Energy Resources ◽  
Marine Energy ◽  
Current Profiler

To assess wave power resources at a marine energy test site in Keelung coastal waters, the SWAN (Simulating WAve Nearshore) model [1; 2] is applied to obtain wave conditions for assessing the wave energy resources. The ocean surface wind velocity by CCMP (Cross-Calibrated Mutli-Platform) is first adopted in SWAN model simulation. Comparisons with field measurements of AWCP (Acoustic Water Column Profiler) station in Port of Keelung and of ADCP (Acoustic Doppler Current Profiler) station offshore NTOU (National Taiwan Ocean University) during periods form Jul 1st to Dec 31st of 2010, show that simulated significant wave heights agree well with measured values except in periods of typhoons and strong northeastern monsoons. However, the simulated peak periods are generally underestimated than the measurements. The same results can also be seen in simulated wave energies. The resulting simulated wave energies agree with measurements better at NTOU test site than at Keelung station.

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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