Hicham Aachi and Mehdi Rouizem launched a first sporting challenge:
to make a tour of Morocco to sail on a catamaran of sport without cabin! They will leave in June 2017 from Saidia for a navigation along the Moroccan coast in 6 legs: Saidia, Tangier, Mohammedia, Agadir, Laayoune and Dakhla. That is a total of 1,300 nautical miles, which is around 2,400 km. With this challenge, the two young sailors wish to start an awareness: The Moroccan coast is full of richness and opportunities, and it deserves to be better preserved ...
Morocco coastal charts from SHOM on the GeoGarage platform
The Seychelles are an angler’s paradise – if you can actually get to them. Follow the crew of the Alphonse Fishing Co. as they wade the flats of the Cosmoledo Atoll, hoping for a shot at Giant Trevally.
For centuries sailors told stories of enormous waves tens of metres
tall.
They were dismissed as tall tales, but in fact they are alarmingly
common
TEN-storey high, near-vertical walls of frothing water.
Smashed
portholes and flooded cabins on the upper decks.
Thirty-metre behemoths
that rise up from nowhere to throw ships about like corks, only to slip
back beneath the depths moments later.
Evocative descriptions of
abnormally large "rogue waves" that appear out of the blue have been
shared among sailors for centuries.
With little or no hard evidence, and
the size of the waves often growing with each telling, there is little
surprise that scientists long dismissed them as tall tales.
Until
around half a century ago, this scepticism chimed with the scientific
evidence.
According to scientists' best understanding of how waves are
generated, a 30m wave might be expected once every 30,000 years.
Rogue
waves could safely be classified alongside mermaids and sea monsters.
However, we now know that they are no maritime myths.
A wave is a disturbance that moves energy between
two points.
The most familiar waves occur in water, but there are plenty
of other kinds, such as radio waves that travel invisibly through the
air.
Although a wave rolling across the Atlantic is not the same as a
radio wave, they both work according to the same principles, and the
same equations can be used to describe them.
A rogue wave is one
that is at least twice the "significant wave height", which refers to
the average of the third highest waves in a given period of time.
According to satellite-based measurements, rogue waves do not only
exist, they are relatively frequent.
The sceptics had got their sums
wrong, and what was once folklore is now fact.
This led scientists to altogether more difficult questions.
Given
that they exist, what causes rogue waves?
More importantly for people
who work at sea, can they be predicted?
Until the 1990s,
scientists' ideas about how waves form at sea were heavily influenced by
the work of British mathematician and oceanographer Michael Selwyn Longuet-Higgins.
In work published from the 1950s onwards, he stated that, when two or
more waves collide, they can combine to create a larger wave through a
process called "constructive interference".
According to the principle
of "linear superposition", the height of the new wave should simply be
the total of the heights of the original waves.
A rogue wave can only
form if enough waves come together at the same point according to this
view.
However, during the 1960s evidence emerged that things might not be so simple.
The key player was mathematician and physicist Thomas Brooke Benjamin, who studied the dynamics of waves in a long tank of shallow water at the University of Cambridge.
With
his student Jim Feir, Benjamin noticed that while waves might start out
with constant frequencies and wavelengths, they would change
unexpectedly shortly after being generated.
Those with longer
wavelengths were catching those with shorter ones.
This meant that a lot
of the energy ended up being concentrated in large, short-lived waves.
At
first Benjamin and Feir assumed there was a problem with their
equipment.
However, the same thing happened when they repeated the
experiments in a larger tank at the UK National Physical Laboratory near
London.
What's more, other scientists got the same results.
For
many years, most scientists believed that this "Benjamin-Feir
instability" only occurred in laboratory-generated waves travelling in
the same direction: a rather artificial situation.
However, this
assumption became increasingly untenable in the face of real-life
evidence.
At 3am on 12 December 1978, a German cargo ship called The München sent
out a mayday message from the mid-Atlantic.
Despite extensive rescue
efforts, she vanished never to be found, with the loss of 27 lives.
A
lifeboat was recovered.
Despite having been stowed 66ft (20m) above the
water line and showing no signs of having been purposefully lowered, the
lifeboat seemed to have been hit by an extreme force.
However, what really turned the field upside down was a wave that
crashed into the Draupner oil platform off the coast of Norway shortly
after 3.20pm on New Year's Day 1995.
Hurricane winds were blowing and
39ft (12m) waves were hitting the rig, so the workers had been ordered
indoors.
No-one saw the wave, but it was recorded by a laser-based
rangefinder and measured 85ft (26m) from trough to peak.
The significant
wave height was 35.4ft (10.8m).
According to existing assumptions, such
a wave was possible only once every 10,000 years.
The Draupner giant brought with it a new chapter in the science of giant waves.
When scientists from the European Union's MAXWAVE project analysed 30,000 satellite images covering a three-week period during 2003, they found 10 waves around the globe had reached 25 metres or more.
"Satellite measurements have shown there are many more rogue waves in the oceans than linear theory predicts," says Amin Chabchoub of Aalto University in Finland.
"There must be another mechanism involved."
In the last 20 years or so, researchers like Chabchoub have sought to
explain why rogue waves are so much more common than they ought to be.
Instead of being linear, as Longuet-Higgins had argued, they propose
that rogue waves are an example of a non-linear system.
A
non-linear equation is one in which a change in output is not
proportional to the change in input.
If waves interact in a non-linear
way, it might not be possible to calculate the height of a new wave by
adding the originals together.
Instead, one wave in a group might grow
rapidly at the expense of others.
When physicists want to study how microscopic systems like atoms
behave over time, they often use a mathematical tool called the
Schrödinger equation.
It turns out that certain non-linear version of
the Schrödinger equation can be used to help explain rogue wave
formation.
The basic idea is that, when waves become unstable, they can
grow quickly by "stealing" energy from each other.
Researchers
have shown that the non-linear Schrödinger equation can explain how
statistical models of ocean waves can suddenly grow to extreme heights,
through this focusing of energy.
In a 2016 study, Chabchoub applied the same models to more realistic, irregular sea-state data, and found rogue waves could still develop.
"We
are now able to generate realistic rogue waves in the laboratory
environment, in conditions which are similar to those in the oceans,"
says Chabchoub.
"Having the design criteria of offshore platforms and
ships being based on linear theory is no good if a non-linear system can
generate rogue waves they can't cope with."
Still, not everyone is convinced that Chabchoub has found the explanation.
"Chabchoub was examining isolated waves, without allowing for interference with other waves," says optical physicist Günter Steinmeyer of the Max Born Institute in Berlin.
"It's hard to see how such interference can be avoided in real-world oceans."
Instead, Steinmeyer and his colleague Simon Birkholz looked at
real-world data from different types of rogue waves.
They looked at wave
heights just before the 1995 rogue at the Draupner oil platform, as
well as unusually bright flashes in laser beams shot into fibre optic cables,
and laser beams that suddenly intensified as they exited a container of
gas.
Their aim was to find out whether these rogue waves were at all
predictable.
The pair divided their data into short segments of
time, and looked for correlations between nearby segments.
In other
words, they tried to predict what might happen in one period of time by
looking at what happened in the periods immediately before.
They then
compared the strengths of these correlations with those they obtained
when they randomly shuffled the segments.
The results, which they published in 2015,
came as a surprise to Steinmeyer and Birkholz.
It turned out, contrary
to their expectations, that the three systems were not equally
predictable.
They found oceanic rogue waves were predictable to some
degree: the correlations were stronger in the real-life time sequence
than in the shuffled ones.
There was also predictability in the
anomalies observed in the laser beams in gas, but at a different level,
and none in the fibre optic cables.
However, the predictability
they found will be little comfort to ship captains who find themselves
nervously eyeing the horizon as the winds pick up.
"In principle, it is possible to predict an ocean rogue wave, but our
estimate of the reliable forecast time needed is some tens of seconds,
perhaps a minute at most," says Steinmeyer.
"Given that two waves in a
severe North Sea storm could be separated by 10 seconds, to those who
say they can build a useful device collecting data from just one point
on a ship or oil platform, I'd say it's already been invented.
It's
called a window."
However, others believe we could foresee rogue waves a little further ahead.
The
complexity of waves at sea is the result of the winds that create them.
While ocean waves are chaotic in origin, they often organise themselves
into packs or groups that stay together.
In 2015 Themis Sapsis and Will Cousins of MIT in Cambridge, Massachusetts, used mathematical models to show how energy can be passed between waves within the same group, potentially leading to the formation of rogue waves.
The following year, they used data from ocean buoys and mathematical modelling to generate an algorithm capable of identifying wave groups likely to form rogues.
Most
other attempts to predict rogue waves have attempted to model all the
waves in a body of water and how they interact.
This is an extremely
complex and slow process, requiring immense computational power.
Instead,
Sapsis and Cousins found they could accurately predict the focusing of
energy that can cause rogues, using only the measurements of the
distance from the first to last waves in a group, and the height of the
tallest wave in the pack.
"Instead of looking at individual waves and
trying to solve their dynamics, we can use groups of waves and work out
which ones will undergo instabilities," says Sapsis.
He thinks his
approach could allow for much better predictions.
If the algorithm was
combined with data from LIDAR scanning technology, Sapsis says, it could
give ships and oil platforms 2-3 minutes of warning before a rogue wave
formed.
Others believe the emphasis on waves' ability to catch
other waves and steal their energy – which is technically called
"modulation instability" – has been a red herring.
"These modulation instability mechanisms have only been tested in
laboratory wave tanks in which you focus the energy in one direction,"
says Francesco Fedele
of Georgia Tech in Atlanta.
"There is no such thing as a
uni-directional stormy sea.
In real-life, oceans' energy can spread
laterally in a broad range of directions."
In a 2016 study,
Fedele and his colleagues argued that more straightforward linear
explanations can account for rogue waves after all.
They used historic
weather forecast data to simulate the spread of energy and ocean surface
heights in the run up to the Draupner, Andrea and Killard rogue waves,
which struck respectively in 1995, 2007 and 2014.
Their models matched the measurements, but only when they factored in
the irregular shapes of ocean waves.
Because of the pull of gravity,
real waves have rounded troughs and sharp peaks – unlike the perfectly
smooth wave shapes used in many models.
Once this was factored in,
interfering waves could gain an extra 15-20% in height, Fedele found.
"When
you account for the lack of symmetry between crest and trough, and add
it to constructive interference, there is an enhancement of the crest
amplitudes that allows you to predict the occurrence observed in the
ocean," says Fedele.
What's more, previous estimates of the
chances of simple linear interference generating rogue waves only looked
at single points in time and space, when in fact ships and oil rigs
occupy large areas and are in the water for long periods.
This point was
highlighted in a 2016 report from the US National Transportation Safety Board,
written by a group overseen by Fedele, into the sinking of an American
cargo ship, the SS El Faro, on 1 October 2015, in which 33 people died.
"If you account for the space-time effect properly, then the probability
of encountering a rogue wave is larger," Fedele says.
Also in 2016, Steinmeyer proposed that linear interference can explain how often rogue waves are likely to form.
As an alternative approach to the problem, he developed a way to
calculate the complexity of ocean surface dynamics at a given location,
which he calls the "effective" number of waves.
"Predicting an individual rogue wave event might be hopeless or
non-practical, because it requires too much data and computing power.
But what if we could do a forecast in the meteorological sense?" says
Steinmeyer.
"Perhaps there are particular weather conditions that we can
foresee that are more prone to rogue wave emergence."
Steinmeyer's group found that rogue waves are more likely when low
pressure leads to converging winds; when waves heading in different
directions cross each other; when the wind changes direction over a wide
range; and when certain coastal shapes and subsea topographies push
waves together.
They concluded that rogue waves could only occur when
these and other factors combined to produce an effective number of waves
of 10 or more.
Steinmeyer also downplays the idea that anything
other than simple interference is required for rogue wave formation, and
agrees that wave shape plays a role.
However, he disagrees with
Fedele's view that sharp peaks can have a significant impact on wave
height.
"Non-linearities have a role, but it's a minor one," he
says.
"Their main role is that ocean waves are not perfect sine waves,
but have more spikey crests and depressed troughs.
However, what we
calculated for the Draupner wave is that the effect of non-linearities
on wave height was in the order of a few tens of centimetres."
In fact, Steinmeyer thinks that Longuet-Higgins had it pretty much
right 60 years ago, when he emphasised basic linear interference as the
driver of large waves, rogue or otherwise.
But not everyone agrees.
In
fact, the argument over exactly why rogue waves form seems set to
rumble on for some time.
Part of the issue is that several kinds of
scientists are studying them – experimentalists and theoreticians,
specialists in optical waves and fluid dynamics – and they have not as
yet done a good job of integrating their different approaches.
There is
no sign that a consensus is developing.
But it is an important
question to solve, because we will only be able to predict these deadly
waves when we understand them.
For anyone sitting on an isolated oil rig
or ship, watching the swell of the waves under a stormy sky, those few
minutes of warning could prove crucial.
North Sea Infrastructure The future development of a North Sea energy system up to approx. 2050 will require a rollout, coordinated at European level, of interlinked offshore interconnectors, i.e. a so-called interconnection hub, combined with large-scale wind power. Any surplus wind power could be converted into other forms of energy, or stored. Situating this interconnection hub on a modularly constructed island in a relatively shallow part of the North Sea would result in significant cost savings. These are the starting points for a proposed efficient, affordable and reliable energy system on the North Sea, which will contribute to European objectives being met. This vision does not preclude the option of providing renewably generated power from the wind farms to nearby oil and gas platforms to reduce Europe's CO2 emissions.
The harnessing of energy has never been without projects of monolithic scale.
From the Hoover Dam to the Three Gorges—the world's largest power station—engineers the world over have recognised that with size comes advantages.
The trend is clear within the wind power industry too, where the tallest wind turbines now tower up to 220m, with rotors spinning through an area greater than that of the London Eye, generating electricity for wind farms that can power whole cities.
While the forecast for offshore wind farms of the future is for ever-larger projects featuring ever-larger wind turbines, an unprecedented plan from electricity grid operators in the Netherlands, Germany, and Denmark aims to rewrite the rulebook on offshore wind development.
A proposed North Sea power link island, as conceived by TenneT
with a map of the North Sea, with the location of the Dogger Bank
and the possible interconnectors highlighted
The proposal is relatively straight-forward: build an artificial island in the middle of the North Sea to serve as a cost-saving base of operations for thousands of wind turbines, while at the same time doubling up as a hub that connects the electricity grids of countries bordering the North Sea, including the UK.
In time, more islands may be built too; daisy chained via underwater cables to create a super-sized array of wind farms tapping some of best wind resources in the world.
“Don’t be mistaken, this is really a very large, very ambitious project—there’s nothing like it anywhere in the world. We’re taking offshore wind to the next level,” Jeroen Brouwers, spokesperson for the organisation that first proposed the plan, Dutch-German transmission system operator (TSO) TenneT, tells Ars Technica.
“As we see it, each island could facilitate approximately 30 gigawatts (GW) of offshore wind energy; but the concept is modular, so we could establish multiple interconnected islands, potentially supporting up to 70 to 100GW.”
The London Array
To add some context to those figures, consider that the world’s largest offshore wind farm in operation today, the London Array, has a max capacity of 630MW (0.63GW), and that all the wind turbines installed in European waters to date amount to a little over 12.6GW.
The Danish TSO Energinet says 70GW could supply power for some 80 million Europeans.
Undoubtedly ambitious, the North Sea Wind Power Hub—as the project is titled—is nevertheless being taken seriously by key stakeholders.
The project was centre of attention at the seminal North Seas Energy Forum held in Brussels at the end of March.
There, the consortium behind the project (Dutch-German TSO TenneT, alongside the Danish TSO Energinet) took the opportunity to sign a memorandum of understanding (MoU) that will drive the project forward over the coming decades.
Dagmara Koska, a member of the cabinet of the EU vice-president in charge of the Energy Union (Maroš Šefčovič), tells Ars Technica: “We’re incredibly supportive of the project and welcome the MoU. The agreement demonstrates commitment to a very exciting prospect; one that stands to create a lot of synergies to benefit the growth of renewables energy in northern Europe.”
On the intentions of the Wind Power Hub, Koska says: “From our perspective, the project fully reflects the spirit of the North Seas Energy Cooperation—the political agreement signed last yearto facilitate deployment of offshore renewable energy alongside interconnection capacity across the region. As Maroš Šefčovič said at the signing, it’s an ingenious solution.”
The London Array wind farm is the largest in operation with 175 wind turbines generating enough power for close to half a million UK homes annually.
A paradigm shift
The North Sea Wind Power Hub represents a fundamentally new approach to the development of offshore wind; one that tackles multiple challenges faced by the wind industry head on and capitalises on economies of scale in a bid to deliver access to the wind resources of the North Sea at reduced costs.
Something of a case of necessity being the mother of invention, Brouwers explains that the Wind Power Hub concept is a response to a looming problem faced by the wind industry: ”At the moment, offshore wind is focused on sites relatively close to shore where development costs are lower. The problem is that there’s not space for the 150GW of offshore wind power that the EU has called for. There are other industrial and economic interests in those near-shore regions—fishing, shipping lanes, military areas and so on.
"This pushes things farther out to sea, but the costs can rapidly rise as you move to deeper waters. The solution? Create near-shore costs, or even lower, out at sea.”
Construction of offshore wind farms is a highly complex logistical and engineering operation
So how would the Wind Power Hub deliver on this objective?
Well, the wind farms envisioned by the project wouldn’t be dissimilar from those we see today, but their proximity and connection to artificial "power link islands" represents a substantial departure from the conventional model for offshore wind.
“The idea is that islands as large as six square kilometres would feature a harbour, a small airstrip, transmission infrastructure, and all equipment necessary to maintain the surrounding wind farms, alongside accommodation and workshops for staff,” Brouwers says.
London Array construction
These novel features would open up a lot of possibilities for wind power developers and operators.
With a base of operations out at sea—complemented with storage of components, assembly lines, and other logistical assets—the installation of wind turbines would be more convenient, efficient, and ultimately cheaper than is achieved by today’s methods which rely on specialised ships journeying out from ports.
Savings on installation would be coupled with reduced expenditure over the twenty-year lifetime of wind turbines, too.
Operations and maintenance of offshore wind turbines—a crucial, albeit expensive, affair that stands to be transformed with a base of operations located out at sea.
Onshore wind farms require a lot of support.
But in harsh marine environments, that need is paramount.
Operations and maintenance, or O&M, is key to ensuring turbines avoid downtime and remain productive. By convention (and presently also by necessity) offshore O&M run out of ports; it's logistically complex and pricey, easily representing some 20% of a wind turbine's levellised cost of energy (LCOE), and increasing with distance from shore.
O&M is a permanent fixture on the wind industry’s list of areas within which it aims to lower expenditure, and highlighted as such by the International Renewable Energy Agency, which reports: “It is clear that reducing O&M costs for offshore wind farms remains a key challenge and one that will help improve the economics of offshore wind.”
“In contrast to what we see today,” says Brouwers, “operating from an island on the doorstep of the wind farms would be a game-changer in terms of reducing costs and simplification of O&M activities.”
Subsea DC cables would not only export power from the wind farms, but will serve as interconnectors between countries bordering the North Sea.
High Voltage Direct Current
Alongside savings on installation and reductions on O&M, a third major cost saving feature of the Wind Power Hub concerns grid connections—the electrical infrastructure that links wind farms with electricity grids.
Typically, grid connection is a significant cost component in offshore wind, representing between 15 to 30% of the capital costs for an offshore wind farm, with costs creeping higher the farther from shore you go.
Like O&M, grid connection is a cost component that holds potential for improvement.
With the Wind Power Hub, instead of alternate current (AC) cables taking electricity from a wind farm to grids onshore—the typical arrangement we see today—the output of multiple wind farms would be directed to a power link island.
There, electricity would be aggregated, conditioned for transmission, and then dispatched to onshore grids of the North Sea countries.
It’s a setup that would reduce the amount of export cables running to individual wind farms, and enable cost-effective use of high-voltage direct current (DC) transmission that boasts the added benefit of reduced losses compared to AC transmission.
International electricity interconnections are the set of lines and substations that allow the exchange of energy between neighbouring countries and generate a number of advantages in connected countries.
North Sea Super Grid: The key to sustainable energy in Europe
As significant as the North Sea Wind Power Hub would be terms of clean energy production and cost reduction of offshore wind power, the broader proposition for the concept goes beyond island-building and supporting wind farms.
It would provide a solution to one of the central challenges in transitioning to a sustainable future.
As Brouwers says: “When we talk about the transition towards 100% sustainable energy production, it’s simply not possible from a national point of view. We need to consider things on a European level, and we need the infrastructure to transport the renewable electricity to where it is needed.”
The inherent difficulty with renewable energy is its intermittency: power generation relies on variable resources like the Sun and wind that we cannot control.
It’s an immutable characteristic of renewables, and one that creates problems for grids trying to balance supply and demand, and ensure efficient use of generated electricity.
At least part of the solution is interconnectors—cables that function as long distance energy conduits across and between electricity grids.
Interconnectors allow for electricity generated in one region to be transmitted to another, and allow countries to import and export electricity.
The UK, for example, has interconnectors with France (2GW), the Netherlands (1GW), Northern Ireland (500MW), and the Republic of Ireland (500MW).
“Without interconnectors we’re not able to balance supply and demand and that’s crucial for the energy transition. It’s absolutely key,” explains the EU Energy Union’s Koska.
“We have cables between some North Sea countries already, but considering the amount of renewables coming online in the region, it’s not enough if we are to optimise use of resources available.”
The imperative and current efforts to establish a European super grid are part of another story for another day, but the significance of interconnectors is neatly outlined in the YouTube video above from the Spanish TSO Red Eléctrica.
In this matter of interconnectors and energy distribution, the Wind Power Hub would serve an extraordinarily valuable purpose; one Koska describes as “a clear response to needs of the European grid, and the goals set by the European Union that would contribute to a crucial part of the energy transition.”
As noted earlier, undersea cables would transmit electricity from islands to countries bordering the North Sea, but the same DC cables would also function as interconnectors between those nations.
Something similar is already under development in the Baltic Sea, where the Combined Grid Solution will connect Danish and German electrical grids via the Kriegers Flak wind farm.
The Wind Power Hub applies a similar logic, albeit connecting via islands and not wind farms, and on a much grander scale.
The Netherlands, Denmark, Germany, the UK, Norway and Belgium are all potential players in this new North Sea grid.
Construction of Mischief island by China has resulted in some 1,379 acres of land.
Specialized ships involved in the construction process can be seen in this image.
The dark lines seen connected to ships are floating pipes that pump sediment to be deposited.
photo : CSIS Asia Maritime Transparency Initiative /Digital Globe
Building islands
Construction of islands is nothing new.
Prominent examples of the practice come from China and Dubai.
Although motivated by radically different intentions (in the former instance, to establish a military presence in waters of the South China Sea; in the latter, to support luxurious hotels and residences) both nations have demonstrated the validity of creating artificial islands to varying specifications.
In the simplest of terms, island-building involves dumping a huge amount of rock and sediment on the seabed until an island emerges.
In reality, a little more finesse and a significant amount of engineering skill goes into the process.
Acumen here means that islands may be built to survive waves, storms, and erosion, as well ensure that the newly minted land can physically support whatever is destined to be built on the island.
Expertise will be especially critical for islands of the North Sea Wind Hub where the northerly climate and rough waters of the North Sea offer up considerable challenges.
Still, with the Netherlands party to the project, there will be no shortage of world-class engineers on hand to deliver solutions.
The Dutch have a long history in land reclamation and have been at the helm of some of the most prominent examples of island building around the world, including those of Dubai.
A European wind power infographic produced by WindEurope in 2016.
The task ahead
The North Sea Wind Power Hub is a vast, multinational project that won't just pop up overnight. Brouwers notes that the consortium imagines a first island could be realised by 2035.
Project literature frames the project as one providing a vision for joint European collaboration out to 2050.
“It’s a long-term project, but it’s important to begin now and that the industry knows what on the horizon,” says Brouwers.
For its part, numerous bodies within the European wind industry have acknowledged and expressed optimism about the project.
Andrew Ho, senior offshore wind analyst of the wind power trade association Wind Europe, tells Ars Technica: “Setting out a long term ambition for offshore wind provides a great signal to the wind sector. It’s not governments that are behind the target yet, it’s TSOs laying out the vision—but it’s still important to know that they see a big role for offshore wind in the future of European energy.
"The reality is we need a lot more clean energy if we’re going to decarbonise and really commit to the actions of COP21. For that, we need the technologies that can deliver vast amounts of clean power with relatively stable output—and that’s what offshore wind gets you.The wind industry would certainly be ready to deliver the volume of offshore wind envisioned by the Wind Power Hub.”
Ho emphasised that the wind industry’s activities over the forthcoming decade will lay the groundwork for the Wind Power Hub's success: “The project would give us a pathway from 2030 to 2050, but we’re missing policy targets for 2023 to 2030. To explore the project’s full potential we need to support development through the next decade to ensure we’re fully cost competitive with other sources of energy in the period leading up to 2030.”
As the industry works towards reducing costs, the consortium will busy itself with more practical matters. Brouwers explains: “The next steps involve feasibility studies. We’re also underway in collaborating with environmental groups about the construction of the islands and in talks with infrastructure companies beyond the energy sector, of the sort that would provide critical insight on the project. There’s certainly a lot of work ahead of us.”
The North Sea Wind Power Hub is an unquestionably mammoth project.
But in so being it aptly reflects the enormity of challenges we face in tackling climate change.
Many would contend that we already have the technologies necessary for transitioning to a sustainable energy system.
The Wind Power Hub project reminds us that boldly pursuing the extraordinary, and resolving to commit to collaborative solutions, are traits that will serve us well in application of those technologies.
The beaches of one of the world’s most remote islands have been found to be polluted
with the highest density of plastic debris reported anywhere on the planet.
From National Geographic by Laura Parker
Henderson Island lies in the South Pacific, halfway between New Zealand and Chile.
No one lives there.
It is about as far away from anywhere and anyone on Earth.
Yet, on Henderson’s white sandy beaches, you can find articles from Russia, the United States, Europe, South America, Japan, and China.
All of it is trash, most of it plastic.
It bobbed across global seas until it was swept into the South Pacific gyre, a circular ocean current that functions like a conveyor belt, collecting plastic trash and depositing it onto tiny Henderson’s shore at a rate of about 3,500 pieces a day.
One researcher claims that a hermit crab that has made its home in a
blue Avon cosmetics pot is a 'common sight' on the island.
The plastic
is very old and toxic, and is damaging to much of the island's diverse
wildlife
Jennifer Lavers, co-author of a new study of this 38-million-piece accumulation, told the Associated Press she found the quantity “truly alarming.”
Much of the trash consists of fishing nets and floats, water bottles, helmets, and large, rectangular pieces.
Two-thirds of it was invisible at first because it was buried about four inches (10 cm) deep on the beach.
“Although alarming, these values underestimate the true amount of debris, because items buried 10 cm below the surface and particles less than 2 mm and debris along cliff areas and rocky coastlines could not be sampled,” Lavers and a colleague wrote in their study, published Tuesday in the scientific journal, Proceedings of the National Academy of Sciences.
The accumulation is even more disturbing when considering that Henderson is also a United Nations World Heritage site and one of the world’s biggest marine reserves.
The UNESCO website describes Henderson as “a gem” and “one of the world’s best remaining examples of a coral atoll,” that is “practically untouched by human presence.”
Henderson Island, with the GeoGarage platform
a coral atoll in the south Pacific, is just 14.5 square miles (37.5 square km), and the nearest cities are some 3,000 miles (4,800 km) away
Henderson is one of the four-island Pitcairn Group, a cluster of small islands whose namesake is famed as the home to the descendants of the HMS Bounty’s mutineers.
Pitcairn’s population, which has dwindled to 42 people, uses Henderson as an idyllic get-away from the day-to-day life on Pitcairn.
But aside from the neighboring Pitcairners, the occasional scientist or boatload of tourists making the two-day sail from the Gambier Islands, Henderson supports only four kinds of land birds, ten kinds of plants, and a large colony of seabirds.
Lavers, a scientist at Australia’s University of Tasmania, and her co-author, Alexander Bond, a conservation biologist, arrived on Henderson in 2015 for a three-month stay.
They measured the density of debris and collected nearly 55,000 pieces of trash, of which about 100 could be traced back to their country of origin.
The duo’s analysis concluded that nearly 18 tons of plastic had piled up on the island—giving Henderson the highest density of plastic debris recorded anywhere in the world—at least so far.
Henderson Island has the highest density of plastic debris in the world, with 3,570 new pieces of litter washing up on its beaches every day.
Jenna Jambeck, a University of Georgia environmental engineering professor, who was one of the first scientists to quantify ocean trash on a global scale, was not surprised that Lavers and Bond discovered plastic in such abundance on Henderson.
Jambeck’s 2015 study concluded that 8 million tons of trash flow into the ocean every year, enough to fill five grocery store shopping bags for every foot of coastline on Earth.
“One of the most striking moments to me while working in the field was when I was in the Canary Islands, watching microplastic being brought onto the shore with each wave,” she says.
“There was an overwhelming moment of ‘what are we doing?’ It’s like the ocean is spitting this plastic back at us. So I understand when you’re there on the beach on Henderson, it’s shocking to see.”
The Henderson research ranks with earlier discoveries of microplastics in places so remote, such as embedded in the deep ocean floor or in Arctic sea ice, that finding plastic in such abundance touched a nerve.
“People are always surprised to find trash in what’s supposed to be an uninhabited paradise island. It does not fit our mental paradigms, and this might be the reason why it continues to be shocking,” says Enric Sala,a marine scientist who led a National Geographic Pristine Seas expedition to the Pitcairn Islands, including Henderson, in 2012.
“There are no remote islands anymore. We have turned the ocean into a plastic soup.”
