Amir Alikhani - M.Sc. P۱۱.D sludent,., Soil ConServation arid Watershed Management Research Center
Peter Frigaard - Assoc. Prof,,,Aalborg University, Sohngaardsholrnsvej ۵۷ DK-۹۰۰۰ Aalborg, Denmark
Hans Burcharth - dr . Techn Prof.,Aalborg University, Sohngaardsholrnsvej ۵۷ DK-۹۰۰۰ Aalborg, Denmark

The data ollcc.tcvl ovcv the coilrscJ of tlle clxl~erimentm ust be analysed and convertcd into a form suitable for its iiltelldcd use. 'l'ype of analyses range from simple to sophisticatetl, depentlirig on the particular experiment and the needs of the researcher. 111 this study tliree rnaii~p art of irregular wave data analyses are presented e.g. Time Domain (Statistical) Analyses, F'requency Domain (Spectral) Analyses aid Wave Reflection Ai~alyses. Randoin wave profile and definitions of representative waves, distributions of individual wave height and wave periods and spectra of sea waves are presented. It is not con~plet,olya 11ow work but is ;L producer which author hiis used for the iu~alysc-!so f tllo 1;~bori~tjorwyo rks diiriug llis P11.D study under supervision of the co-autl~ors. Secatise such a lecture is i~otp resenting in the hydraulic engineering courses in the lral~iiuU~i ~iversitiesi t was decided to give such a lecture as a paper.