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Watershed Planning within a Quantitative Scenario Analysis Framework
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Numerical study on tsunami hazard mitigation using a submerged breakwater.

Taemin Ha1, Jeseon Yoo1, Sejong Han2

  • 1Coastal Disaster Research Center, Korea Institute of Ocean Science & Technology, 787 Haeanro, Ansan 426-744, Republic of Korea.

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Summary

This study predicts wave runup heights on submerged coastal structures using large eddy simulations. Results show reduced runup, aiding safer, cost-effective coastal defense design.

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Area of Science:

  • Coastal Engineering
  • Fluid Dynamics
  • Numerical Modeling

Background:

  • Coastal structures are vital for protection but face complex wave dynamics in surf zones.
  • Accurate wave behavior prediction is crucial for designing safe and economical coastal defenses.
  • Wave height significantly influences the design of levees and armoring materials.

Purpose of the Study:

  • To predict the runup heights of nonlinear waves passing a submerged structure in a surf zone.
  • To investigate the characteristics of reduced wave runup.
  • To analyze wave reflection, transmission, and dissipation coefficients.

Main Methods:

  • Utilized a numerical model based on large eddy simulation (LES).
  • Simulated nonlinear wave transformation over a submerged structure.
  • Analyzed wave runup, reflection, transmission, and dissipation.

Main Results:

  • Successfully predicted nonlinear wave runup heights.
  • Observed and quantified reduced wave runup heights due to the submerged structure.
  • Determined wave reflection, transmission, and dissipation coefficients.

Conclusions:

  • The study demonstrates the effectiveness of LES for predicting wave runup.
  • Submerged structures can effectively reduce wave runup heights.
  • Understanding wave transformation is key to optimizing coastal structure design for safety and cost-efficiency.