A fisheries application of a dual-frequency identification sonar acoustic camera

Moursund, Russell A.; Carlson, Thomas J.; Peters, R D

doi:10.1016/s1054-3139(03)00036-5

Cited by 119 publications

(74 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Other sampling technologies, including a fish wheel (Meeham 1961) and sonar imaging (Moursund et al 2003), are currently being tested on the Elwha River to ascertain their ability to estimate adult abundance. If successful, a fish wheel can be used to estimate adult population size using mark-recapture techniques.…”

Section: Recolonization Monitoring Parametersmentioning

confidence: 99%

Movements by Adult Coho Salmon in the Lower Elwha River, Washington

et al. 2008

View full text Add to dashboard Cite

Section: Recolonization Monitoring Parametersmentioning

confidence: 99%

Movements by Adult Coho Salmon in the Lower Elwha River, Washington

et al. 2008

View full text Add to dashboard Cite

“…It has greater attenuation, but has been used successfully in operating intakes on intake bar screens for the in-situ observation of juvenile lamprey (Moursund et al 2003b). Visibility is not generally a factor for acoustic methods over the 10-m ranges found in the intake and scroll case regions, as the particulate organic matter in the water will not obscure acoustic images at the approximately 1 MHz or less frequencies of operation typically used (Moursund et al 2003a).…”

Section: Visibilitymentioning

confidence: 99%

“…Only one system comes close in terms of the spatial scale, operating frequency, and frame rate necessary for turbine-scale investigations: the dual-frequency identification sonar, or DIDSON (Moursund et al 2003a). …”

Section: Acoustic Imagingmentioning

confidence: 99%

Turbine imaging technology assessment

Moursund

Carlson

2004

View full text Add to dashboard Cite

Executive SummaryJuvenile fish passing through the turbines of hydro electric dams are exposed to numerous injurycausing mechanisms including both fluid and mechanical forces. Previous research has shown that these mechanisms cause similar-looking injuries to fish so most biological testing techniques have been inadequate for identifying specific causes of injury under different operating scenarios. Use of imaging technologies inside the turbines to observe the approach and interaction of fish with turbine structural elements has been proposed as one means for gaining a clearer understanding of causes of injury. In 2003 and 2004 Pacific Northwest National Laboratory conducted an investigation of imaging technologies that included theoretical and laboratory studies.The goal of this project was to identify and evaluate imaging technologies for observing juvenile fish within a Kaplan turbine, and specifically that would enable us to determine mechanisms of fish injury within an operating turbine unit. This evaluation documents the opportunities and constraints for observing juvenile fish at specific locations during turbine passage. These observations would be used to make modifications to dam structures and operations to improve conditions for fish passage while maintaining or improving hydropower production.The physical and hydraulic environment that fish experience as they pass through the turbines, including the physical structures of the intake, stay vanes, wicket gates, and runner, were studied and the regions with the greatest potential for injury were defined. Biological response data were also studied to determine the probable types of injuries sustained in the turbine intake and what types of injuries are detectable with imaging technologies. We grouped injury-causing mechanisms into two categories: fluid (pressure/cavitation, shear, turbulence) and mechanical (strike/collision, grinding/pinching, scraping). The physical constraints of the environment, together with the likely types of injuries to fish, provided the parameters needed for a rigorous imaging technology evaluation.Types of technology evaluated included both tracking and imaging systems using acoustic technologies (such as sonar and acoustic tags) and optic technologies (such as pulsed-laser videography, which is high-speed videography using a laser as the flash). Criteria for determining image data quality such as frame rate, target detectability, and resolution were used to quantify the minimum requirements of an imaging sensor. We based our calculations on the most demanding application --imaging head injuries to a subyearling Chinook salmon smolt passing through the runner tip region. Previous ex-situ and in-situ study results were used, along with the results from a laboratory experiment we conducted, to address tradeoffs in sensor capability in the typically low-visibility riverine environment. We concluded that a high-speed optical-imaging solution, such as pulsed-laser videography, was the only feasible technology to image fish fast e...

show abstract

“…In the study of underwater environments, the use of forward looking sonar (FLS) systems is increasing thanks to the high frame rate, relatively high resolution, low power consumption and portability [1,2,3]. Forward looking sonar is a type of sonar that produces a 2D image by stacking 1D images produced by a 1D transducer array.…”

Section: Introductionmentioning

confidence: 99%

Video Enhancement for Underwater Exploration Using Forward Looking Sonar

Kim

Neretti

Intrator

2006

Advanced Concepts for Intelligent Vision Systems

View full text Add to dashboard Cite

Abstract. The advances in robotics and imaging technologies have brought various imaging devices to the field of the unmanned exploration of new environments. Forward looking sonar is one of the newly emerging imaging methods employed in the exploration of underwater environments. While the video sequences produced by forward looking sonar systems are characterized by low signal-to-noise ratio, low resolution and limited range of sight, it is expected that video enhancement techniques will facilitate the interpretation of the video sequences. Since the video enhancement techniques for forward looking sonar video sequences are applicable to most of the forward looking sonar sequences, the development of such techniques is more crucial than developing techniques for optical camera video enhancement, where only specially produced video sequences can benefit the techniques. In this paper, we introduce a procedure to enhance forward looking sonar video sequences via incorporating the knowledge of the target object obtained in previously observed frames. The proposed procedure includes inter-frame registration, linearization of image intensity, and maximum a posteriori fusion of images in the video sequence. The performance of this procedure is verified by enhancing video sequences of Dual-frequency Identification Sonar (DIDSON), the market leading forward looking sonar system.

show abstract

A fisheries application of a dual-frequency identification sonar acoustic camera

Cited by 119 publications

References 1 publication

Movements by Adult Coho Salmon in the Lower Elwha River, Washington

Movements by Adult Coho Salmon in the Lower Elwha River, Washington

Turbine imaging technology assessment

Video Enhancement for Underwater Exploration Using Forward Looking Sonar

Contact Info

Product

Resources

About