Underwater noise pollution in China’s Yangtze River critically endangers Yangtze finless porpoises (Neophocaena asiaeorientalis asiaeorientalis)

2020 ◽  
Vol 262 ◽  
pp. 114310 ◽  
Author(s):  
Zhi-Tao Wang ◽  
Tomonari Akamatsu ◽  
Peng-Xiang Duan ◽  
Lu Zhou ◽  
Jing Yuan ◽  
...  
2021 ◽  
Vol 226 ◽  
pp. 112860
Author(s):  
Zhi-Tao Wang ◽  
Peng-Xiang Duan ◽  
Tomonari Akamatsu ◽  
Yu-Wei Chen ◽  
Xue An ◽  
...  

2021 ◽  
Vol 154 (A2) ◽  
Author(s):  
R C Leaper ◽  
M R Renilson

Underwater noise pollution from shipping is of considerable concern for marine life, particularly due to the potential for raised ambient noise levels in the 10-300Hz frequency range to mask biological sounds. There is widespread agreement that reducing shipping noise is both necessary and feasible, and the International Maritime Organization is actively working on the issue. The main source of noise is associated with propeller cavitation, and measures to improve propeller design and wake flow may also reduce noise. It is likely that the noisiest 10% of ships generate the majority of the noise impact, and it may be possible to quieten these vessels through measures that also improve efficiency. However, an extensive data set of full scale noise measurements of ships under operating conditions is required to fully understand how different factors relate to noise output and how noise reduction can be achieved alongside energy saving measures.


2012 ◽  
Author(s):  
M Renilson ◽  
◽  
R Leaper ◽  
O Boisseau ◽  
◽  
...  

2021 ◽  
Author(s):  
Amron Amron ◽  
Rizqi Rizaldi Hidayat ◽  
Maria Dyah Nur Meinita ◽  
Mukti Trenggono

Abstract As the main contributor to noise pollution in Cilacap waters, the noise characteristics of traditional fishing boats based on distance are very important to be studied. This research aimed to determine noise intensity and frequency based on the distance for each traditional fishing boat (3, 5, and 10 GT). The results showed that these boats emitting noise with broadband frequency and receive levels reached 153 dB re 1 μPa. The noise characteristics were different for each type of ship due to differences in the size, engine type, and operational speed. The receive level had the same decreased pattern based on the distance for each noise frequency, but with a different intensity. Meanwhile, the noise frequency had increased quadratically based on the distance, where the higher frequency, the greater change so that the noise was not detected faster.


Bioderecho.es ◽  
2021 ◽  
Author(s):  
Esteban Morelle Hungría

El ruido en mares y océanos es uno de los más complejos contaminantes que existen y ello es una muestra de la necesidad, imperiosa, de que juristas se pongan a analizar tal compleja situación desde un planteamiento ecosistémico y a escala multinivel. Vemos como la contaminación acústica subacuática dispone de mecanismos e instrumentos jurídicos de control y regulación, sin embargo, parece que todavía los impactos que generan son de tal intensidad que existen ciertas lagunas, quedando mucho por descubrir. Desde este posicionamiento analizamos la necesidad de seguir bajo el prisma del principio de precaución o bien, priorizar sobre otro de los principios funcionales del Derecho ambiental, el de prevención. Underwater noise is one of the most complex pollutants that exist and this is a sign of the imperative need for jurists to analyze such a complex situation from an ecosystem approach and on a multilevel scale. We see how underwater noise pollution has mechanisms and legal instruments for control and regulation, however, it seems that the impacts they generate are still of such intensity that there are certain gaps, leaving much to discover. From this position we analyze the need to continue under the prism of the precautionary principle or, to prioritize over another of the functional principles of environmental law, prevention.  


Author(s):  
Beomgi Kim ◽  
Junghyun Lee ◽  
Gayoung Jin ◽  
Changkeun Lee ◽  
Jong Seong Khim

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