WAVE SET-UP, WAVE RUN-UP AND BEACH WATER-TABLE - INTERACTION BETWEEN SURF ZONE HYDRAULICS AND GROUNDWATER HYDRAULICS

The relationship between wave set-up, wave run-up and beach water table is reviewed, starting from the work and ideas of Nielsen and using laboratory observations of wave set-up and beach water table in beaches formed from various beach materials under similar wave conditions. A new more extensive analysis of wave set-up on impermeable fixed plane beaches has been made using all available experimental data. Scaling parameters for set-up and water depth, based upon both deep water and breaking wave conditions and incorporating appropriate forms of the surf similarity parameter, are developed. The dimensionless set-up parameters are of the form (eta-BAR-eta(b)BAR)H0-xi-0n where 0.3 < n < 0.5 for deep water wave parameters and (etaBAR-eta(b)BAR)/ H(b) (tan-alpha)I(b)n where n almost-equal-to 0.4 for breaking wave conditions. xi-0 = (tan-alpha)/square-root H0/L0 and I(b) = H(b)1/2/g1/2T tan-alpha