Shallow water wave characteristics off Cochin during monsoon 1986

Abstract

Shallow water wave measurements were carried out off Cochin (depth 12.5 m) during May to October 1986. Wind speed (U), significant wave height (Hs) and zero-upcrossing period(Tz)varied between 2 and 9 m. sec(-1), 0.4 and 2 m, and 3.5 and 8 sec respectively. The value of U measured at the coast was less compared with the open sea and did not show significant correlation with Hs and Tz. However, both wind and waves show diurnal variability although a major portion of the wave energy was propagated from deep waters as swells. The present analysis revealed very good correlation between Hs and Tz. Onshore and offshore components of the wind normal to the coastline also showed better correlation with Hs and Tz.