The Straight and Narrow: The Fascinating Formation of Square Waves

When two wave systems travel at oblique angles, they sometimes create the incredible phenomenon of square waves.

Two wave systems creating a cross swell at Île de Ré, France. Photo: Michel Griffon

The Amazing Phenomenon of Square Waves – Bestbabies.info

A cross sea (also referred to as a squared sea or square waves) is a rare and stunning sight of ocean waves that form a square pattern. But don’t be fooled by its beauty – it’s also very dangerous for swimmers and boaters.

This peculiar sea state occurs when wind-generated ocean waves form nonparallel wave systems with a large amount of directional spreading. This means that the waves come from different directions and interfere with each other, creating a grid-like pattern on the water surface.

The Amazing Phenomenon of Square Waves – Bestbabies.info

A cross sea can occur when water waves from one weather system continue despite a shift in wind. Waves generated by the new wind run at an angle to the old. Two weather systems that are far from each other may also create a cross sea when the waves from the systems meet at a place far from either weather system. Until the older waves have dissipated, they can present a perilous sea hazard.

Cross sea near Lisbon, Portugal in April 2019. Photo: Rehman Abubakr

A cross swell is a similar phenomenon, but it involves longer-period swells, rather than short-period wind-generated waves. Swells are waves that have traveled far from their source and have become more regular and smooth. A cross swell can also form when two swells coexist at oblique angles.

A cross sea is fairly common and a large percentage of ship accidents have been found to occur in this state. Vessels fare better against large waves when sailing directly perpendicular to oncoming surf. In a cross sea scenario, that becomes impossible as sailing into one set of waves necessitates sailing parallel to the other.

The Amazing Phenomenon of Square Waves – Bestbabies.info

Another photo of a cross swell taken at the same lighthouse at Petit phare des Baleines, Île de Ré, France. Photo: Le Guide Charente Maritime

More common in shallow waters, cross seas can often be seen off the western point of France’s Isle of Rhé (see images above), for example, or on the beaches of Tel Aviv (see video below), though they can arise in many coastal regions around the world.

They are usually associated with strong and powerful rip tides, which are fast-moving currents that can pull swimmers away from the shore.

The Amazing Phenomenon of Square Waves – Bestbabies.info

The waves in a cross sea can also be unusually tall and steep, reaching up to nearly three meters high in some cases. These are sometimes called white walls, because they look like vertical walls of water that can tip over large boats and cause shipwrecks.

If you see a cross sea, you should under no circumstances enter the water. And if, by some chance, they suddenly appear around you, then the idea is to get to shore as quickly as possible. When the ocean goes rogue, it doesn’t mess around. Neither should you.

Sources: 1, 2, 3, 4

Related Posts

The 850ft Triple Waterfall: A Spectacular Sight of Unique Rock Formations and World-Class Rapids

These remarkable pictures show a unique three-tiered waterfall in northern Lebanon as water crashes down through circular rock formations and cavernous gorges. The photographs were taken by Ralph Azar and Jack Seikaly, from Beirut, Lebanon, at the 850ft-high …

Read more

Botanical Marvels: The Epigmatic Plants with the Most Astonishing Forms Ever Seen

It’s basically an online home of detectives who will use their joint effort to come up with a solid explanation for what is an object that you have no clue about. Known as r/Whatisthisthing, this community has 2M members and they help others with not …

Read more

Enchanting Trees: The Fascinating Human Forms Found in Nature

Seeіng ѕtrange ѕculptureѕ on аncient treeѕ “honed” by nаture wіll ѕurely mаke mаny рeoрle utter ѕurpriѕe, even ѕtartle Tree Stumр Trаnsformаtion Thіs іs а straightforward аnd good-lookіng іdea for thoѕe who do not wаnt to do а lot. Do not …

Read more

Discover the Archipelago of Dreams: Where Everyone Owns a Private Island

Between the Canada-United States border, there is a beautiful place called Thousand Islands. You might know the name because of the extremely delicious salad dressing, but there is more to Thousand Islands than that. It’s an archipelago consisting of …

Read more

Hidden Wonders of the Grand Canyon: Secret Waterfalls and Unseen Corners Revealed

It is one of America’s greatest natural wonders – a spectacular scar in the dusky soil of Arizona that ranks as one of the best-known landmarks on the planet. Indeed, show most people a photograph of the Grand Canyon, and they should recognise it instantly …

Read more

Unveiling the Ocean’s Secrets: Fascinating and Unexplained Phenomena

The depths of the ocean hold numerous mysteries that continue to fascinate us, even as scientists work to unravel their secrets. From unexplained phenomena witnessed by sailors to intriguing enigmas that spark debates, the ocean remains a source of wonder …

Read more

Leave a Reply

Your email address will not be published. Required fields are marked *