This video introduces the concept of wave intensity for 3D waves by considering the wave power of an acoustic wave. Applying conservation of energy shows how the intensity decreases with distance from the source and that the relationship is different for both surface and bulk waves and how knowing this can lead to some amazing measurements.
This video lecture series by Prof. Roger Moore from the University of Alberta includes both screencast lectures, as well as comprehensive laboratory experiments to explain a whole range of topics in fluid mechanics and wave motion. The lectures are all offered in HD quality.
Major topics include: elasticity, fluid statics, fluid dynamics, oscillations, and waves.