Fig. 1

Experimental setup. h0 donates the offshore water depth; hr donates the reef-flat water depth"

Fig. 2

Swell height (HSS), infragravity wave height (HIG) and total wave height (HT), across the reef profile (wave condition HS0=0.08m, Tp=1.5s, hr=0.05m )"

Fig. 3

Variations of swell height (HSS) and infragravity wave height (HIG) with reef-flat width (Wr) near the coastline at G8 (HS0=0.08m). Circles denote Tp=1.5s; Squares denote Tp=1.5s; Triangles denote Tp=2.0s; Solid markers denote hr=0.05m; Open markers denote hr=0.1m"

Fig. 4

Variation of wave-induced setup (${{\bar{\eta }}_{\text{ r}}}$) on the reef-flat width with (a) incident significant wave height (HS0) and (b) reef-flat width (Wr). Circles donate Tp=1.0s; Squares donate Tp=1.5s; Triangles donate Tp=2.0s; Black markers donate hr=0.05m; White markers donate hr=0.1m"

Fig. 5

Variation of wave spectra with different reef-flat widths (Wr) across the reef profile (HS0=0.08m, Tp=1.5s, hr=0.05m). The dashed line denotes the splitting frequency between the swell wave and the infragravity wave frequency bands"

Fig. 6

Wave spectra within the infragravity band ($f$= 0 - 0.33 Hz) near the coastline (G8) under different water depths (hr), periods (Tp) and reef-flat widths (Wr). (a) HS0=0.08m, Tp=1.5s, hr=0.05m, Wr=8m; (b) HS0=0.08m, Tp=1.5s, hr=0.1m, Wr=8m; (c) HS0=0.08m, Tp=1.0s, hr=0.05m, Wr=8m; (d) HS0=0.08m, Tp=2.0s, hr=0.05m, Wr=8m; (e) HS0=0.08m, Tp=1.5s, hr=0.05m, Wr=4.8m; (f) HS0=0.08m, Tp=1.5s, hr=0.05m, Wr=11.2m. In each plot, the left vertical dashed line denotes the first-order resonant frequency, and the right vertical dashed line denotes the second-order resonant frequency"