A Method of Analysis of Annual Variations of Harbor Water and Earth Temperatures [includes discussion]

In this paper, an analysis is made of the variation of ambienit temperatures of submarine and underground cable installations with respect to time and depth. A method of mathematical analysis of the initial temperature distribution is given for earth exposed to air and for earth under a relatively thick body of slowly moving water such as Baltimore Harbor. The average annual water temperature at the bottom of this harbor is within a few degrees of the average annual air temperature. The data and equations presented in this paper indicate that the annual variation in the earth below such a body of water, as well as below earth exposed to air, vary sinusoidally. The amplitude decreases and the time lag increases with increasing depth.