A- A A+
Log in

Login form

You need to sign in to those awesome features
or use your account
Remember me
Power by Joomla Templates - BowThemes

NHA Banner

 Notices on Our Content: Member Protected Content,  Walk Acess Restrictions may apply.

up    We collected weblinks for our Custom Google Search above to help you target searches to nature websites we like. Submit your favourite nature website - contact us.
Internet Explorer users need to be on Version 10+.


The surf provides many exciting recreation opportunities, but it is also a very powerful natural phenomenon. Many years ago the distant sound of breaking surf could sometimes even be heard on Tamborine Mountain. This is no longer possible, but from the Mountain we can still see evidence of the surf’s power, when heavy surf throws plumes of salt spray high into the air along the coast.

Most ocean waves are caused by wind blowing over the surface of the ocean; friction between the air and the water transfers energy from the wind into the ocean and pushes the particles of water into a circular movement that creates the shape of a wave. Ocean waves appear to be movements of water, but they are really movements of energy, and although ocean waves can travel great distances, there is actually very little forward movement of the water particles themselves.

Waves organise themselves into sets, because energy is transferred from the leading and trailing waves to the central waves it is these waves that become the largest in the set.

Surf is a breaking wave and it is created when a wave makes contact with the seabed and friction slows the velocity of the wave base, but the top of the wave continues to move at the same speed. Eventually this speed difference causes the wave to tip forward, break apart and release its energy.

Breaking waves exist in a highly variable environment influenced by wind, tides and currents but it is basically the profile of the seabed which creates different types of breaking waves. These have been classified into different types based on changes to the wave surface profile during the breaking process.

Surging waves are found in deep water, they are stable and do not break.

Spilling waves are found where there is a sloping or gentle gradient of seabed, the crest of the wave crumbles at the top and spills down the front of the wave, dissipating energy uniformly. Spilling waves are usually predictable with waves breaking when their height is one to point seven times the water depth eg 1 metre wave will break in 1 to 1.4 metres of water.

Plunging or dumping waves occur where the seabed is steep or shallow, and the base of the wave is slowed abruptly, the crest of the wave curls forward and plunges over the front of the wave, releasing energy suddenly.

The fluid dynamics of broken waves are complex, but most obviously the mass of water released by the waves must quickly return seawards to maintain the water level, and this forms an undertow or rip which tends to end at the last line of breakers.  

The familiar sound of the surf is thought to be primarily caused by the bursting, splitting and oscillations of plumes of bubbles.

Although, as yet, we still do not fully understand the complex mechanics of the surf zone, it remains a source of enjoyment, excitement, relaxation and inspiration for many people.

Share this post

Submit to DeliciousSubmit to DiggSubmit to FacebookSubmit to Google PlusSubmit to StumbleuponSubmit to TechnoratiSubmit to TwitterSubmit to LinkedIn

Injured Wildlife

   Wildcare SEQ



Animal Control

Photo Gallery Tree

Random Images - NHA

  • 2013-07-13 Albert River Circuit
  • Description: Bushwalking in SE Qld
  • 2017-02-18 Contour1 - Sicyos australis - Star Cucumber
  • 2016-03-12 Coomera Circuit_119
  • Description: Bushwalking in SE Qld
  • 2012-08-11 West Canungra Creek
  • Description: Bushwalking in SE Qld

Why does attentiveness to nature matter? In a very fundamental sense, we are what we pay attention to. Paying heed to beauty, grace, and everyday miracles promotes a sense of possibility and coherence that runs deeper and truer than the often illusory commercial, social "realities" advanced by mainstream contemporary culture. ... Our attention is precious, and what we choose to focus it on has enormous consequences. What we choose to look at, and to listen to--these choices change the world. As Thich Nhat Hanh has pointed out, we become the bad television programs that we watch. A society that expends its energies tracking the latest doings of the celebrity couple is fundamentally distinct from one that watches for the first arriving spring migrant birds, or takes a weekend to check out insects in a mountain stream, or looks inside flowers to admire the marvelous ingenuities involved in pollination. The former tends to drag culture down to its lowest commonalities; the latter can lift us up in a sense of unity with all life. The Way of Natural History, edited by Thomas Lowe Fleischner and published by Trinity University Press (Texas)