Summary and Recommendations

The reviews of theory, laboratory and field data, and published guidance for engi-neering applications presented here have identified static and dynamic wave setup components as contributing to the deviation from still water level in the surf zone and their relevance to engineering design. Examination of the static wave setup has reinforced the effect of beach slope on wave setup. The theory presented here does not account for the onshore bottom stress acting on the water column due to undertow.

The available field measurement results exhibit a wide range of wave setup to wave height ratios. Some of this variability is undoubtedly due to the effect of profile slope, which is not accounted for explicitly in some of the analyses and part is due to the effect of wave-breaking in depths greater than the shallow water limit.

Design methodology should account for the static and dynamic wave setup com-ponents. In determining the wave setup to include in design, the characteristics of the particular application of interest should be compared with those of the various field and laboratory experiments available including those referenced here. The dom-inant role of beach slope should be recognized. The preliminary results presented here ofη/H_s= 0.191± 0.100 may serve as a useful guide for the static wave setup component.

It is hoped that further research with improved instrumentation, modern sur-veying techniques, and more diverse field site studies will help to clarify both the static and dynamic wave setup components for future design applications.

22 R. G. Dean and T. L. Walton

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Chapter 2