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Related Concept Videos

Wave Parameters01:10

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
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All forms of waves carry energy; this is directly visualized in nature. For instance, the waves of earthquakes are so intense that they can shake huge concrete buildings, causing them to fall. Loud sounds can damage nerve cells in the inner ear, causing permanent hearing loss. The waves of the oceans can erode beaches. 
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Velocity and Acceleration of a Wave00:51

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A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
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Updated: Mar 8, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Wind Wave Behavior in Fetch and Depth Limited Estuaries.

Arash Karimpour1, Qin Chen2,3,4, Robert R Twilley4,5

  • 1Louisiana Sea Grant, Louisiana State University, Baton Rouge, LA 70803, USA.

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|January 19, 2017
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Estuaries are vital ecosystems threatened by erosion. New equations predict wind wave growth in shallow waters, crucial for designing effective wetland restoration strategies and mitigating coastal erosion.

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Area of Science:

  • Coastal science
  • Estuarine ecology
  • Oceanography

Background:

  • Wetland-dominated estuaries provide critical ecological, economic, and cultural services.
  • Deterioration of these ecosystems is a growing concern, impacting coastal restoration efforts.
  • Understanding wind wave dynamics in shallow, fetch-limited waters is essential for estuary management.

Purpose of the Study:

  • To experimentally investigate wind wave growth physics in fetch- and depth-limited estuarine environments.
  • To develop new parametric wave growth equations applicable to shallow estuaries.
  • To inform coastal restoration designs by quantifying wave forces on wetlands.

Main Methods:

  • Experimental evaluation of wind wave growth in controlled shallow water conditions.
  • Analysis of wave growth rates in relation to fetch and water depth ratios.
  • Development and validation of new wave growth equations based on experimental data.

Main Results:

  • Wave growth rate in shallow estuaries is directly related to the wind fetch to water depth ratio.
  • A new set of parametric wave growth equations was developed for shallow estuarine systems.
  • The final stage of wave growth is characterized by the product of water depth and wave number approaching 1.363.

Conclusions:

  • The developed wave growth equations and their constraints provide a tool to estimate wave forces impacting wetland erosion.
  • This research is critical for the successful design and implementation of coastal wetland restoration projects.
  • Understanding estuarine wave dynamics is key to preserving the ecological services of these productive ecosystems.