Karl-Friedrich Daemrich, Soren Kohlhase


Diffraction calculations for breakwaters are often based on SOMMERFELDs solution, which is mathematically exact for thin full-reflecting walls. For breakwaters with low reflecting frontsides, and if guidewalls are used, commonly a modified solution is applied, reducing the second term of the solution- formula proportional to the degree of reflection. It could be shown that this approach is not sufficient in the region just behind the breakwater, especially for small angles of wave attack. Regarding the exact solution for wedges it was possible to determine a special weighing factor for the second term of the SOMMERFELD solution, dependent on the degree of reflection and the wave direction, which leads to a better agreement between model tests and theoretical results.


reflection; diffraction; breakwater reflection

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