AbstractIt is common for the local sea state in coastal waters to be a complex combination of waves due to local and recent wind (the "sea†) and long period waves resulting from earlier weather systems, which have travelled many 100s of km with little attenuation of these very long waves (the "swell†). Sea and swell may have very different directions and periods. The CrossOver project was born out of the recognition that there is an absence of guidance on the influence of directionally bimodal (or bidirectional, or 'crossing') seas on wave overtopping at a coastal defence. Through a physical model study carried out in the Delta Basin, the "CrossOver† project is beginning to fill this gap in the knowledge.
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