Abstract
Abstract Wave force data, obtained by Chevron Oil Field Research Co. in conjunction with Shell Development Co. and Exxon Production Research Co.. have been reanalyzed for drag and inertia coefficients. These data are the field results of Wave Projects I and II and consist of water surface elevations and forces on piles of various sizes at different elevations within the water column. The analysis here is based on the stream function wave theory and Morison's equation, resulting in drag (CD) and inertia (CM) coefficients including a dependency on Reynolds number. Principal findings are a somewhat higher value for CD at large Reynolds numbers than that obtained by Aagaard and Dean.1 Free surface effects include a run-up on the piling and an associated local modification in drag coefficients, resulting in reductions in overall forces and moments. Using a large data set of 349 waves (digitized at 0.1 second), variances between predicted and measured forces also were obtained that followed a normal probability distribution.
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