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Wave damping by seagrass

  • Low wave velocity
  • High wave velocity

The videos show how the model seagrass meadow move in response to waves. We conducted experiments with different wave velocities. The wave conditions we used in the lab overlapped with a wide range of field conditions with wind waves.
The meadow of model seagrass was constructed with individual plants consisting of six LDPE (low-density polyethylene) blades and a cylindrical wooden stem. The wooden stem (grey part) mimiched the sheath of real seagrass. Two plants were colored black for better visualization.

The two images show the degree of pronation (bending) of model plants. When there are no waves, the plants are stationary so that the blades are upright. However, when the wave exists, the blades will move in response to the flow. The images named "pronated blades" show the most pronated position during a wave cycle.

Jiarui Lei; Heidi Nepf
Paper 1
Lei, J. and Nepf, H., 2019. Blade dynamics in combined waves and current. Journal of Fluids and Structures87, pp.137-149.

Paper 2
Lei, J. and Nepf, H., 2019. Wave damping by flexible vegetation: Connecting individual blade dynamics to the meadow scale. Coastal Engineering147, pp.138-148.

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This web site was launched by Prof. Michele Mossa of the Polytechnic University of Bari (Italy) with the initial support of Fondazione Caripuglia, Bari, Italy for the Research Project LIC-MON of 2003 and of the Project IMCA (Integrated Monitoring of Coastal Areas) financed by MIUR PON D.M. 593/00. Later, the initiative was supported with other Prof. Michele Mossa’s funds, most recently provided by the RITMARE Project.

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