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Interference and Superposition of Waves

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...

Travelling Waves

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Sound Waves: Interference

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Related Experiment Video

Updated: Jun 14, 2025

Evolution of Staircase Structures in Diffusive Convection

Evolution of Staircase Structures in Diffusive Convection

Published on: September 5, 2018

Interacting internal waves explain global patterns of interior ocean mixing.

Giovanni Dematteis^1,2, Arnaud Le Boyer³, Friederike Pollmann⁴

¹Dipartimento di Fisica, Università degli Studi di Torino, Torino, Italy. giovannidematteis@gmail.com.

Nature Communications

|August 29, 2024

Summary

Turbulent mixing in the deep ocean, driven by breaking internal waves, propels dense water upward. This study provides a physics-based explanation for wave-driven mixing, crucial for understanding ocean circulation and climate change.

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Area of Science:

Oceanography
Fluid Dynamics
Climate Science

Background:

Deep ocean upwelling is driven by turbulent mixing.
This mixing is primarily caused by breaking internal waves generated by winds and tides.
Current models use heuristic parameterizations lacking full theoretical explanation.

Purpose of the Study:

To provide a theoretical explanation for turbulent mixing in the abyssal ocean.
To develop a physics-based parameterization for wave-driven mixing in ocean models.

Main Methods:

Applied wave-wave interaction theory.
Incorporated localized and global observational data.
Validated first-principle predictions against observed mixing patterns.

Main Results:

Demonstrated near-ubiquitous agreement between theoretical predictions and observed mixing patterns globally.
Established a theoretical framework for internal wave energy transfer and breaking.
Quantified the contribution of wave-driven mixing to abyssal upwelling.

Conclusions:

The study provides the first physics-based explanation for deep ocean turbulent mixing.
Findings support the development of improved ocean general circulation models.
Accurate representation of wave-driven mixing is essential for predicting future climate states.