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.

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

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
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