Modellierung von Wellen und welleninduzierten Kraeften im Windwellenkanal

Wind generated laboratory waves are compared with water waves measured during field experiments on the Lake of Constance. Wave ordinates largely differ from the normal distribution. While the wave heights on the Lake of C. obey the Raleigh distribution, wave heights in the laboratory resemble the Gaussian distribution. Contrary to natural waves, laboratory waves often appear in groups. Laboratory waves represent a quasi regular system with randomized wave heights. Wave shape analysis revealed that laboratory waves are much more steep than natural waves. Laboratory waves almost reach the limit steepness according to the criterium by Miche. Laboratory wave spectra are very narrow, and the energy is concentrated in the region of the dominating frequency. Lake surface waves are characterized by a much broader distribution and a more pronounced directional behaviour. The difference between laboratory and natural waves largely restrict any modelling work. In the last part of this treatise the forces of laboratory waves on a cylinder were studied based on the results of differential force measurements. (WEN)Available from TIB Hannover: RN 3431(48) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman