Abstract
Sound speed and absorption in seawater are considered to be basic and important factor to design the SONAR. The author creating and operation on the Internet Website (http://www.tsuchiya2.org/) that could easily calculate sound speed and absorption (propagation loss) in seawater by PHP which was kind of the web script language. As equations of the sound speed of the seawater, Mackenzie, Coppens, Del Grosso, UNESCO (Chen & Millero) were used. As an equation of the absorption, Thorp, Shulkin & Marsh Fisher & Simmon, Francois & Garrison, Ainsle & McColm were used. In this site, the value of each equation is calculated with a web-server by a user inputting the DTS (depth, temperature, salinity), frequency and PH from a WEB browser of client. The calculation result is output through the Internet by a web-browser of a client. In addition, sound speed and the absorption (propagation loss) profiles of the depth direction are calculated by a client's uploading a DTS (CSV) file in this site.
