2.2. Bathymetry
The idealized cross section of a barrier reef adopted for the modeling includes a sloping fore-reef, a horizontal reef flat, a sloping back-reef, a deeper lagoon, and the shoreface (Fig. 1). It is assumed that the fore-reef and back-reef have slope of 1:2 (26°), the beach has slope of 1:10 (6°), and that the water depth on the outer fore-reef is 50 m. A range of values for the width (50–1200 m) and depth (0.5–3 m) of the reef flat and the width (50–2000 m) and depth (5–20 m) of the lagoon were combined to create 540 different reef profiles. In addition, the roughness of the reef was varied, resulting in a total of 1080 different reef bathymetries (Table 1). A base bathymetry was also chosen for more detailed investigations and model testing or where comparison is required with a particular control case. This profile has a reef flat width of 400 m, a reef flat depth of 1 m, a lagoon width of 1000 m, a lagoon depth of 10 m, and a surface roughness of 0.1 m. This profile is representative of the main reef at Lizard Island, Great Barrier Reef (GBR) Australia (as outlined below), which was selected as a representative location for the selection of appropriate climatic wind, wave and tide data for the model study. The range of the bathymetric parameters (reef flat depth and width, lagoon width and depth, and surface roughness, representing coral cover and dead carbonate) was selected based on typical values for reefs in the GBR and worldwide. In the present study, the reef flat depth is a key parameter; for ease of reference we refer to reefs with reef flat depths in the range 0.5–1 m and 2.5 m–3 m as shallow reefs and deep reefs, respectively. While tides are not included, the range of water levels considered encompasses typical tidal ranges. Hence, results for different water levels are also representative of conditions at different stages of the tide.
2.2. bathymetryThe idealized cross section of a barrier reef adopted for the modeling includes a sloping fore-reef, a horizontal reef flat, a sloping back-reef, a deeper lagoon, and the shoreface (Fig. 1). It is assumed that the fore-reef and back-reef have slope of 1:2 (26°), the beach has slope of 1:10 (6°), and that the water depth on the outer fore-reef is 50 m. A range of values for the width (50–1200 m) and depth (0.5–3 m) of the reef flat and the width (50–2000 m) and depth (5–20 m) of the lagoon were combined to create 540 different reef profiles. In addition, the roughness of the reef was varied, resulting in a total of 1080 different reef bathymetries (Table 1). A base bathymetry was also chosen for more detailed investigations and model testing or where comparison is required with a particular control case. This profile has a reef flat width of 400 m, a reef flat depth of 1 m, a lagoon width of 1000 m, a lagoon depth of 10 m, and a surface roughness of 0.1 m. This profile is representative of the main reef at Lizard Island, Great Barrier Reef (GBR) Australia (as outlined below), which was selected as a representative location for the selection of appropriate climatic wind, wave and tide data for the model study. The range of the bathymetric parameters (reef flat depth and width, lagoon width and depth, and surface roughness, representing coral cover and dead carbonate) was selected based on typical values for reefs in the GBR and worldwide. In the present study, the reef flat depth is a key parameter; for ease of reference we refer to reefs with reef flat depths in the range 0.5–1 m and 2.5 m–3 m as shallow reefs and deep reefs, respectively. While tides are not included, the range of water levels considered encompasses typical tidal ranges. Hence, results for different water levels are also representative of conditions at different stages of the tide.
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