Analysis of shallow water ambient noise due to rain and derivation of rain parameters

Ocean ambient noise time series data were measured in shallow waters off the East coast of India from 09/12/2011 to 20/01/2012 and off the West coast of India from 16/05/2012 to 03/07/2012 at around 30 m ocean depth using hydrophones placed at 15 m depth in the mid water column. The measurements of wind and rain were recorded by an anemometer and precipitation type rain gauge mounted on a buoy. The objective of this work is to analyse the ambient noise caused by rain and determining the rain parameters such as rain drop size, rain fall rate, terminal velocity, impact angle, etc. This is the first time such open sea measurements of noise have been made in Indian seas along with environmental parameters and influence of rain on ambient noise field is studied.