Dam-Atoll In A Nutshell

Concise Description Of Dam-Atoll:

In their book RENEWABLE ENERGY SOURCES AND THEIR ENVIRONMENTAL IMPACT (New Delhi, Prentice-Hall Of India, 2006, pp. 60-61), S.A. Abbhasi and Naseema Abbasi provide the best and most concise description of Dam-Atoll that we have seen:
This device [Dam-Atoll] does not respond to the up-and-down wave motion but utilizes wave refraction to alter the wave direction and concentrates the wave energy into a vortex that drives a turbine. The vortex in the central core of the device serves as a fluid flywheel. The flywheel turns a turbine generator. A key element in the dam-atoll device is the large dome. The dome must be about 100 m in diameter, comparable in size to the roof covering a football stadium. As a wave travels over the dome, the velocity of the wave slows as the water depth decreases. This causes the wave to bend, or refract, so that it is focused into the centre of the dome. Vanes then help to guide the flowing water into the vertical cylinder and turbine. The Polynesian people apparently understood this principle well because they knew there was no safe lee side on a volcanic atoll. An ocean wave breaking over an atoll is always refracted around to the lee side, where it breaks on the shore, as well as breaking on the windward side. The Lockheed Missiles and Space company has built and tested a 1/100-scale model to demonstrate the proof of this concept. [See the video of the working model.] A full-scale unit, 80 m in diameter, is expected to generate about 1MWe of power output. Ecological impact should be minimal for the dam-atoll type machine....

Dam-Atoll And Acoustic Labs:

As a minor correction, we would like to note that the 1/100-scale working model wasn't built and tested at Lockheed Missiles and Space (located in Sunnyvale, California), but at the Lockheed California's Rye Canyon Acoustical Testing Laboratory in Santa Clarita, California, where it was conceived and designed by its inventor, L.S. Wirt. This is the circumstance that prompted one Lockheed executive to label Dam-Atoll "The damndest thing ever to come out of an acoustic lab." But that the invention came out of an acoustic lab does make sense, since, in a brilliant leap of the imagination, it applies acoustical principles such as Fermat's to the problem of extracting energy from ocean waves.

Waves And Roses:

With apologies to Gertrude Stein (whose famous/infamous poem reads: "Rose is a rose is a rose is a rose"), a wave is a wave is a wave, whether it be a pond ripple, a massive ocean breaker, or a sound wave.

The Patent Is Now In The Public Domain:

One more minor correction: although Lockheed California was the original assignee of the patent, Lockheed for various reasons failed to follow through on the invention and develop it beyond a working scale model. The patent is now in the public domain, where it may be used by any individual or organization with the requisite insight, imagination, alertness to possibility, and sense of environmental urgency.

Continuing With The Explication Of What Dam-Atoll Is And How It Works:

In the pages that follow, we present more detailed explanations of the principles behind Dam-Atoll, starting with an explication of its name.>>>next

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Worst Pun Of The Year Every Year

Best And Most Concise Description Of Dam-Atoll

The damndest thing that ever came out of an acoustics lab

Fermat's Principle

The Patent for Dam-Atoll is now in the public domain

The Name Dam-Atoll Tells How It Extracts Ocean Wave Energy

Dam-Atoll An Amalgam Of the Concepts Dam And Atoll

Dams And Kinetic, Potential, and Mechanical Energy

River As Kinetic Energy

Kinetic Energy Transformed To Potential Energy

Potential Energy Transformed Back To Kinetic Energy

Kinetic Energy Turned Into Mechanical Energy

An Atoll Bends And Refracts The Approaching Wave

Wave Velocity

Wave Refraction

When the submerged atoll is dome-shaped, it refracts the wave path to its center

The exact shape of the atoll's dome is critical

the atoll acts as a kind of lense concentrating the wave energy

A Wave's Potential Energy Gets Changed To Kinetic Energy By An Atoll

A wave is nothing but energy

Waves And Potential And Kinetic Energy

A deep-water ocean wave is always half potential and half kinetic energy

Wave is all kinetic energy when it breaks on the center of the atoll

Changing A Wave's Kinetic Energy To Mechanical Energy By Means Of A Vortex


Vortex is a fluid flywheel

Dam-Atoll, Vortex, Guide Vanes

This in sum is how Dam-Atoll works

Smoothing out the succession of wave pulses

Advantages Over The Other Ocean Wave Energy Extraction Devices

Dam-Atoll has only one moving part

Thus Dam-Atoll loses no energy in monkey motion

Monkey motion

Competing Ocean Wave Energy Extraction Devices are monkey motion machines

Energy Efficiency

Diffuser Important To Energy Efficiency

Mathematically Optimal Shape Of Dome Crucial To Energy Efficiency

A Future So Bright For Ocean Systems You Will Need Sunglasses

The Patent for Dam-Atoll is now in the public domain

The Opportunity

Leslie Wirt is available for lectures

Leslie Wirt offers consulting services

Video of working scale model of Dam-Atoll

Dam-Atoll Patent

Michael McCormick's Comments On Dam-Atoll

John Isaac's Comments On Dam-Atoll

Links To Books, Articles, And Web Sites Mentioning Dam-Atoll

Excerpts From Scattering And Absorption Of Surface Waves By Arthur's Island

Future Prospects For Dam-Atoll

Dam-Atoll Humor


About the inventor of Dam-Atoll, Leslie S. Wirt

Contact Leslie Wirt


Next: The Name Tells How Dam-Atoll Works


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