Wave Measurements Using an Air Pressure Gauge Available to Purchase

An equipment for wave and tide measurements using an air pressure gauge was developed and tested in a Brazilian coastal site (Ilha Grande Bay Maritime Terminal, Lat 23° 03’ 22” S/ Lon 44° 14’ 07” W) for 18 months. The main properties of this equipment were the low production costs and the improved maintenance procedures required by a dry sensor fixed over the sea water level. Data were analyzed using a standard Fast Fourier Transform (FFT) algorithm and the results were very good. As an example of the adequate spectral resolution attained with the analysis methodology, results from a bimodal sea state will be presented, the first peak with period of 5.43 seconds and the second one with a period of 8.30 seconds.