Bottom Drag Coefficient on a Shallow Barrier Reef

The present paper reports of a field experiment over shallow, roughness-varying barrier reef at Maupiti island, French Polynesia. depth-averaged momentum balance is used to estimate the bottom drag coefficient Cd, which varies from 0.01 0.3, with dependence on both depth and structure. effect Cd well predicted by log dependency, as in previous laboratory fields observations. results extend approach system more wave exposure higher roughness-to-depth ratio. Additionally, statistical relationship between high-resolution topography hydrodynamical parameters discussed.