Three-Dimensional Characteristics Observation of Ocean Waves in Coastal Areas by Microwave Doppler Radar

Abstract

Wind wave and swell usually coexist in real ocean waves, both in offshore and coastal areas. This phenomenon often results in multiple peaks in the wave spectrum. Directional wave spectra and the radial velocity of the ocean waves obtained from the microwave Doppler radar which has been developed by Wuhan University were used as data sets to observe three-dimensional characteristics. The radial velocity relative to the radar of the ocean waves in a range can be measured by this radar directly, and then the velocity spectrum can be converted into the wave spectrum through an assigned conversion function. The three-dimensional chart of the radial velocity of the ocean waves demonstrates the direction and velocity of the waves. Meanwhile, the variation in the wave crest and trough is also reflected in the three-dimensional chart. The three-dimensional features of wave radial velocity and wave spectrum were distinct, which play an important role in describing the shape and characteristics of the ocean wave.