Building offshore wind can permanently deafen porpoises, but OK now with Bubble Walls?

January 4th, 2024 By Joanne Nova @ CFACT 1 Comment

Now they tell us

Wind farms save the world, and absolutely do not hurt dolphins or whales but did you know the industry has developed bubble curtains to protect porpoises hearing from the things that never harm them (isn’t that nice of them)?  Bubble curtains are being “widely” used in Germany, Denmark and the Netherlands.

The BBC is happy to report it now there are good results from a study, but apparently they weren’t too enthused in 2013 about telling us how pile -driving during construction can permanently destroy hearing in marine mammals. Indeed, ocean noise is such a problem the pile-driving teams use acoustic deterrents — loud noises designed to scare marine life away before they get started on the industrial noise. But even the “safety warning” may itself be dangerous.

So that’s alright then, windfarm construction used to kill porpoises, and the BBC kept that a secret, but now that we’ve solved it, it’s news we can use, right?

“Like a giant jacuzzi.”

 How bubble curtains protect porpoises from wind farm noise 

As huge offshore wind farms spread across Europe’s North and Baltic seas, efforts grow to buffer the impact on wildlife.

Over the past decade, a curious invention has spread across Europe’s northern seas. It’s called a big bubble curtain, it works a bit like a giant jacuzzi, and it helps protect porpoises from the massive underwater noise caused by wind farm construction.

The original pile-driving in that study was actually done around 2009. If intrepid investigators from the BBC cared about marine life for real and investigated, they could possibly have reported it 14 years ago and before another 4,000 wind turbines were hammered in to the sea floor. Do dolphins matter or don’t they?

It appears the BBC only mentioned underwater noise pollution once before in 2018,  and the one reference to a windfarm was buried in a list of other industrial sources of noise. There were no headlines “Windfarm construction kills porpoises”. If coal miners used pile-drivers and was killing dolphins, the BBC would headline it and then repeat it until children at school were signing songs about it.

But those wind farmers are the nicest guys designing these jucuzzis just for porpoises:

A very large, perforated hose is laid on the seabed, encircling the wind turbine site. Air is pumped through, and bubbles rise from the holes to the surface of the water, forming a noise-buffering veil.

The quirky gadget, also known as a big bubble veil, was pioneered in Germany to help protect the endangered harbour porpoise, the only cetacean species living in its North Sea and Baltic Sea. The bubble curtain was designed around the porpoise’s specific needs and traits, lowering wind farm construction noise to a threshold deemed safe for the species, based on scientific research. Its proven muffling effect may also benefit other marine mammals that are vulnerable to noise, such as seals.

But the mid-air bird slicing will continue.

 

How many porpoises were deafened and left to die wandering the ocean blindly before the bubblers began?

 

The BBC propaganda team doesn’t think to ask when they started using the bubble walls:

 

The bubble curtain is now widely used by northern European countries racing to build more offshore wind farms as part of their efforts to curb CO2 emissions and fight global warming. Countries including the Netherlands, Germany, Denmark and Belgium have pledged to turn the North Sea into “the world’s largest green power plant“, aiming to jointly increase their offshore wind capacity there to 300GW by 2050.

 

In the North Sea, the number of wind turbines has risen from only 80 in 2002, to more than 4,000 today – and many more are planned as part of the green energy revolution. Spinning in fierce, fast sea winds, offshore turbines can produce more energy than those on land. On average, an onshore wind turbine generates around 2.5 to 3 megawatts (MW), …

It only took the BBC ten years to mention the Dähne study of 2013:

At close range, pile-driving noise can cause temporary hearing loss or even permanent deafness in harbour porpoises, leaving them disoriented and unable to survive. There can also be indirect damage. A 2013 study of pile-driving during the first offshore wind farm built in the German North Sea found that the noise prompted harbour porpoises to flee the area, swimming more than 20km (12 miles) away. Harbour porpoises need to eat and hunt almost constantly to meet their energy needs. Fleeing over long distances can disrupt that vital activity and make them vulnerable to starvation. Seals may be similarly affected.

Harbour Porpoises have been having a hard time in the Baltic Sea. At least one mammal experts suggests they are dying awfully young:

Siebert points out that while porpoises can generally live for more than 20 years, in the Baltic Sea the average life span for females is just under four years, and in the North Sea, just under six years. “The animals in our waters die far too early,” she says.

Where is Greenpeace when a porpoise needs them?

REFERENCE

Michael Dähne et at (2013) Effects of pile-driving on harbour porpoises (Phocoena phocoena) at the first offshore wind farm in Germany, Environmental Research Letters, Volume 8, Number 2, DOI 10.1088/1748-9326/8/2/025002

This article originally appeared at JoNova