JONSWAP

The Joint North Sea Wave Project (JONSWAP) is a spectral wave model developed in the late 1960s and early 1970s by a group of researchers from several European countries. The primary goal of the project was to create a wave spectrum that could accurately represent the wave conditions in the North Sea, which was known for its complex and variable wave climate. The JONSWAP spectrum is a parametric wave spectrum that describes the distribution of wave energy across different frequencies. It is widely used in ocean engineering, coastal engineering, and marine meteorology to predict wave conditions and design structures that can withstand wave forces. The JONSWAP spectrum is characterized by a peak enhancement factor, which accounts for the presence of a dominant wave frequency, and a spectral width parameter, which describes the spread of wave energy around the peak frequency. The JONSWAP spectrum has been validated and verified through extensive field measurements and has become a standard tool for wave analysis and forecasting. It is available in various forms, including the original JONSWAP spectrum and the modified JONSWAP spectrum, which includes a correction for the effect of wind on wave growth. The JONSWAP spectrum has been widely adopted and is used in many wave forecasting models and engineering applications.