Water wave models and wave forces with shear currents

Water wave models and wave forces with shear currents

Dalrymple, R.A.

Rijkswaterstaat

KWP-collection

1973-08-01

Water wave modeIs, incorporating shear currents, are developed for linear and nonlinear waves. The first model assumes a constant vorticity over the depth of the fluid; the case for a wave propagating on a linear shear current. For greater generality, a second model is presented which assumes that the fluid is composed of two layers, each with a different, but constant, vorticity. The nonlinear solutions require the use of a numerical perturbation procedure. The last wave model, using a finite difference approach, generates waves propagating on arbitrary vorticity distributions. Examples of the effect of the vorticity on the waves are presented. Further, the use of two of these models in the analysis of actual measured wave data is shown. Wave force measurement programs conducted for the purposes of obtaining drag and inertia coefficients on structures are affected by the presence of currents, and the biases introduced into these coefficients by neglecting the currents are investigated via small amplitude wave theory. Further, an approximate procedure for de termining currents for measured wave force data is presented, as weIl as some results from Wave Project 11 dàta, which were obtained during Hurricane Carla in the Gulf of Mexico.

shear currents
linear waves
nonlinear waves
vorticity

http://resolver.tudelft.nl/uuid:05b19f31-0d7a-42c7-b17c-f04c47dd0f8f

University of Florida

COASTAL AND OCEANOGRAPHIC ENGINEERING LABORATORY University of Florida Gainesvilie, Florida Technical Report No. 20

Hydraulic Engineering Reports

report

(c) 1973 Dalrymple