scholarly journals Studies on Fish Behaviour Control by Air Bubble Curtain. I. Fish Herding Effect by Air Bubble Curtain in Small Scale Experimental Tank.

1991 ◽  
Vol 57 (7) ◽  
pp. 1301-1306 ◽  
Author(s):  
Seiji Akiyama ◽  
Takafumi Arimoto ◽  
Makoto Inoue
Keyword(s):  
Small Scale ◽  
Fish Behaviour ◽  
Experimental Tank ◽  
Air Bubble ◽  
Bubble Curtain

scholarly journals Fish Herding Effect by Air Bubble Curtain in Small Scale Set-net.

1996 ◽  
Vol 62 (2) ◽  
pp. 286-287 ◽  
Author(s):  
Seiji Akiyama
Keyword(s):  
Small Scale ◽  
Air Bubble ◽  
Bubble Curtain

scholarly journals Studies on Fish Behaviour Control by Air Bubble Curtain II. Fish Herding Effect by Air Bubble Curtain in a Large Circular Tank.

1992 ◽  
Vol 58 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Seiji Akiyama ◽  
Takafumi Arimoto ◽  
Makoto Inoue
Keyword(s):  
Fish Behaviour ◽  
Air Bubble ◽  
Bubble Curtain

Development of an air bubble curtain to reduce underwater noise of percussive piling

2000 ◽  
Vol 49 (1) ◽  
pp. 79-93 ◽  
Author(s):  
B. Würsig ◽  
C.R. Greene ◽  
T.A. Jefferson
Keyword(s):  
Underwater Noise ◽  
Air Bubble ◽  
Bubble Curtain

Best practice of using air-bubble curtains as part of complex fish protection structures

2021 ◽  
pp. 24-32
Author(s):  
В.Д. Шульгин ◽  
С.С. Набоков
Keyword(s):  
Best Practice ◽  
Hydraulic Calculation ◽  
Air Bubble ◽  
Functional Efficiency ◽  
Standard Values ◽  
The Operating Mechanism ◽  
Technical Features ◽  
Fish Protection ◽  
Bubble Curtain ◽  
Protection Structures

Приведены результаты исследований работы комплексных рыбозащитных сооружений с использованием воздушно-пузырьковых завес. Дано описание механизма работы комплексных рыбозащитных сооружений и принципа работы воздушно-пузырьковой завесы. На основе гидравлического расчета разработана методика проектирования и применения воздушно-пузырьковой завесы в составе комплексных рыбозащитных сооружений. Приведены результаты исследований по оценке функциональной эффективности построенных комплексных рыбозащитных сооружений. Комплексные рыбозащитные сооружения, имеющие в своем составе запани и воздушно-пузырьковые завесы и работающие в эрлифтном режиме, достаточно эффективно защищают молодь рыб. При правильно подобранных параметрах работы оборудования и выбранном створе размещения сооружений, с учетом гидравлических и технических особенностей водозабора, их эффективность гарантированно превышает нормативные значения. The results of studying the operation of complex fish protection structures with the use of air-bubble curtains are presented. A description of the operating mechanism of complex fish protection structures and the principle of operation of the air-bubble curtain is given. On the basis of a hydraulic calculation, a method for designing and using an air-bubble curtain as part of complex fish protection structures has been developed. The results of estimating the functional efficiency of the built complex fish protection structures are presented. The complex fish protection structures that include debris deflectors and air-bubble curtains and operate in an air-lift mode, effectively protect fish fry. Provided the operating parameters of the equipment and the selected alignment of the structures with account of the hydraulic and technical features of the water intake have been correctly chosen, their efficiency is guaranteed to exceed the standard values.

scholarly journals A basic study to determine the barrier effect of an air bubble curtain in the whiteleg shrimp, Litopenaeus vannamei

2010 ◽  
Vol 76 (2) ◽  
pp. 210-212 ◽  
Author(s):  
KEISHI MATSUDA ◽  
SETSUO NOHARA ◽  
TAKESHI NOMURA ◽  
MARCY N. WILDER
Keyword(s):  
Litopenaeus Vannamei ◽  
Barrier Effect ◽  
Basic Study ◽  
Air Bubble ◽  
Whiteleg Shrimp ◽  
Bubble Curtain

scholarly journals Study of the Sound Escape with the Use of an Air Bubble Curtain in Offshore Pile Driving

2021 ◽  
Vol 9 (2) ◽  
pp. 232
Author(s):  
Yaxi Peng ◽  
Apostolos Tsouvalas ◽  
Tasos Stampoultzoglou ◽  
Andrei Metrikine
Keyword(s):  
Noise Reduction ◽  
Wave Field ◽  
Ecological Impact ◽  
Free Field ◽  
Pile Driving ◽  
Noise Prediction ◽  
Underwater Noise ◽  
Air Bubble ◽  
Noise Transmission ◽  
Bubble Curtain

Underwater noise pollution generated by offshore pile driving has raised serious concerns over the ecological impact on marine life. To comply with the strict governmental regulations on the threshold levels of underwater noise, bubble curtains are usually applied in practice. This paper examines the effectiveness of an air bubble curtain system in noise reduction for offshore pile driving. The focus is placed on the evaluation of noise transmission paths, which are essential for the effective blockage of sound propagation. A coupled two-step approach for the prediction of underwater noise is adopted, which allows us to treat the waterborne and soilborne noise transmission paths separately. The complete model consists of two modules: a noise prediction module for offshore pile driving aiming at the generation and propagation of the wave field and a noise reduction module for predicting the transmission loss in passing through an air bubble curtain. With the proposed model, underwater noise prognosis is examined in the following cases: (i) free-field noise prediction without the air bubble curtain, (ii) waterborne path fully blocked at the position of the air bubble curtain while the rest of the wave field is propagated at the target distance, (iii) similarly to (ii) but with a non-fully blocked waterborne path close to the seabed, and (iv) air bubble curtain modeled explicitly using an effective medium theory. The results provide a clear indication of the amount of energy that can be channeled through the seabed and through possible gaps in the water column adjacent to the seabed. The model allows for a large number of simulations and for a thorough parametric study of the noise escape when a bubble curtain is applied offshore.

scholarly journals The use of an air bubble curtain to reduce the received sound levels for harbor porpoises (Phocoena phocoena)

2011 ◽  
Vol 130 (5) ◽  
pp. 3406-3412 ◽  
Author(s):  
Klaus Lucke ◽  
Paul A. Lepper ◽  
Marie-Anne Blanchet ◽  
Ursula Siebert
Keyword(s):  
Phocoena Phocoena ◽  
Air Bubble ◽  
Sound Levels ◽  
Harbor Porpoises ◽  
Bubble Curtain

scholarly journals 3D Sonar Measurements in Wakes of Ships of Opportunity

2012 ◽  
Vol 29 (6) ◽  
pp. 880-886 ◽  
Author(s):  
Alexander Soloviev ◽  
Christopher Maingot ◽  
Mike Agor ◽  
Lou Nash ◽  
Keith Dixon
Keyword(s):  
Bubble Dynamics ◽  
Three Dimensional ◽  
Small Scale ◽  
Air Bubbles ◽  
Hydrodynamic Models ◽  
Near Surface ◽  
Ship Wake ◽  
Air Bubble ◽  
Quantitative Estimates ◽  
Object Of Study

Abstract The aim of this work is to test the potential capabilities of 3D sonar technology for studying small-scale processes in the near-surface layer of the ocean, using the centerline wake of ships of opportunity as the object of study. The first tests conducted in Tampa Bay, Florida, with the 3D sonar have demonstrated the ability of this technology to observe the shape of the centerline wake in great detail starting from centimeter scale, using air bubbles as a proxy. An advantage of the 3D sonar technology is that it allows quantitative estimates of the ship wake geometry, which presents new opportunities for validation of hydrodynamic models of the ship wake. Three-dimensional sonar is also a potentially useful tool for studies of air-bubble dynamics and turbulence in breaking surface waves.

scholarly journals Differences in composition of territories in relation to behaviour, stage, and depth of the three-spot damselfish, Stegastes planifrons, in Caribbean coral reefs

SURG Journal ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 52-57
Author(s):  
Maria J. Arroyo Gerez
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Large Scale ◽  
Life Stage ◽  
Small Scale ◽  
Fish Behaviour ◽  
Short Term ◽  
Algal Diversity ◽  
Stegastes Planifrons

Coral reef diversity is correlated with the depth at which the reefs are found, the energy available for biological processes, and the species’ roles and presence throughout the food chain. Can a specific species activity alter the whole ecosystem? Can a small-scale, short-term activity such as fish behaviour have a long-term effect on a larger scale, that of the reef? Can the life stage of a species mediate substrate competition? The three-spot damselfish (Stegastes planifrons) is hypothesized to regulate competition between substrate coverage by actively farming – protecting from herbivores and weeding – in order to regulate the algal species composition and percent coverage of the reef. This behaviour is observed in both juvenile and adult fish. Deeper patches are predicted to have less coral diversity and higher algal diversity; juvenile fish are predicted to have less diversity in their patches than adults. Coral and algal diversity are hypothesized to be negatively correlated. In this study, behaviour of the S. planifrons was classified into one of four categories (active patrolling, passing patrolling, farming, and hiding) and palatable algae surface area coverage was digitized from photographs; life stage was either juvenile or adult. Coral and algal genus diversity were measured along a depth gradient of 0-16 m where the diversity of the reef was thought to be the highest. A three-way ANCOVA was performed to test whether fish behaviour (a small-scale, short-term process), depth, or fish development stage (juvenile or adult) had a significant effect on coral or algal diversity (a large-scale, long-term process). Results showed a significant effect of fish behaviour category on algal genera diversity, and a significant effect of depth on both algal and coral genera diversity. Farming yielded significantly more algal coverage than hiding. This study shows that small-scale, short-term behaviours by S. planifrons can have an effect on algal genera diversity on coral reefs in Utila, Honduras. Keywords: Stegastes planifrons (three-spotted damselfish); behaviours (short-term, small-scale); stage of development (juvenile, adult); depth; coral reef and algal diversity (long-term, large-scale); damselfish territories

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