How Surfing Works: An Interactive 3D Wave Explainer

How Surfing Works

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How Surfing Works is an interactive 3D explainer. Turn on JavaScript to watch the film and try the timing game. The short version:

Born in a storm

Every wave you surf began as wind — often a storm thousands of kilometres away.
Wind drags on the sea: ripples grow into chop, chop into swell. Stronger wind, blowing longer over more open water, builds bigger swell.
Swell sorts itself into long, smooth lines that can cross whole oceans while losing surprisingly little energy.
The twist: the water does not travel with the wave. Each drop just loops in a circle — only the energy moves forward.
The loops shrink with depth. About half a wavelength down (the wave base) the water is almost still.

In deep water a swell never touches the bottom. It rolls along at full speed.
As the seabed rises, the water loops scrape the bottom. The wave slows down and grows taller — this is called shoaling.
The base drags while the crest keeps going, so the face gets steeper and steeper…
When the height reaches about 0.8 × the water depth it can no longer hold its shape. The crest pitches forward: the wave breaks.
A gentle slope makes soft, crumbling waves. A sudden reef makes hollow, powerful ones.

Great waves do not break all at once. They peel: the break runs along the crest like a zipper. That is what lets you ride across it.
Peak — the highest point, where it starts to break. This is where surfers take off.
Pocket — the steep part right beside the curl, where the wave has the most power and speed.
Face and shoulder — the open, unbroken wall ahead of you. It gets softer the further it is from the curl.
Lip and barrel — on hollow waves the lip throws out over the face and leaves a tube of air: the barrel.
Whitewater — the foam left behind the curl. Beginners learn here: it simply pushes you toward the beach.

Where a wave breaks depends on what is underneath it. Surfers talk about three kinds of break.
Beach break — waves break over shifting sandbars. Peaks pop up in different places and often peel both left and right: an A-frame.
Point break — swell wraps around a headland and peels down the coast in long, even walls. The best for long rides.
Reef break — waves jack up over shallow rock or coral. Hollow, powerful and consistent, but the bottom is close and sharp.

A surf forecast is a recipe. Learn to read a few numbers and you will know if it is worth paddling out.
Swell height & period — period is the time between waves. A long period (12 s or more) carries more energy, so waves break bigger and stronger than the height suggests.
Swell angle — swell hitting the coast at an angle peels. Swell that hits straight on breaks all at once: a closeout.
Wind — light or offshore (from land to sea) is best. Onshore wind makes it choppy and crumbly.
Tide — changes the depth of water over the bottom. Low tide is often hollower and faster; high tide softer and fuller.

Paddle. Lie on the board, chest up, and paddle hard toward shore. You must match the wave’s speed so it can pick you up.
Pop up. Hands under your chest, push, and spring to your feet in one move — front foot between your hands, knees bent.
Drop and turn. Angle along the face instead of going straight to the beach, then lean into a bottom turn.
Trim the pocket. Stay close to the curl where it is steepest. Rise and fall on the face to keep your speed.
Get barrelled. If the lip throws over you, crouch low, hold your line, and ride out with the spray.
Kick out. When the wave ends, turn up and over the back of it — then paddle back out for the next one.

Timing is everything. Pop up too early and the wave rolls under you; too late and it throws you over the falls.
Look back as it comes and paddle hard — you want to already be moving when the wave reaches you.
Too early: the wave has not picked you up yet. You stand on flat water, lose speed, and it rolls under you.
Just right: the tail lifts and the board starts to glide down the face on its own. That is the moment — pop up.
Too late: you are at the very top as the lip pitches. The nose digs in and you go over the falls.

Right of way: the surfer closest to the breaking part of the wave (the peak) has priority. Everyone else waits.
Never drop in. Taking off in front of someone already riding is the number-one rule broken in the water. It is dangerous and rude.
Rip currents are rivers of water rushing back out to sea. Waves pile water onto the beach, and it escapes through deeper gaps between the sandbars.
Spot one by the calm-looking, darker gap where waves are not breaking — often with foam or sand drifting outward.
Caught in one? Do not swim against it. Stay calm, float, swim parallel to the beach until you are out of the pull, then let the waves bring you in.

Paddling out…