Sea-wave spectrum by echo sounder

Authors

  • J. N. NANDA
  • N. K. BALACHANDRAN

DOI:

https://doi.org/10.54302/mausam.v11i2.4115

Abstract

Nanda (1957) suggested a method of making a relative estimate of the standing crop in the ocean by studying the fluctuation of the echoes received on an echo-sounder. Taking the number of scatterers to be obeying Poisson distribution, it was shown that the average number of scatterers N is equal to 4/a2 times the mean square deviation of a series of values of log a/a0 where a is the average scattering coefficient per organism and a and ao are the received and transmitted amplitudes. Besides the density of standing crop in the ocean, the other factors which contribute to the fluctuation of the echoes are the changes in reflectivity of the ocean bottom, and the oscillation of the vessel due to state of the sea.

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Published

01-04-1960

How to Cite

[1]
J. N. . NANDA and N. K. . BALACHANDRAN, “Sea-wave spectrum by echo sounder”, MAUSAM, vol. 11, no. 2, pp. 167–168, Apr. 1960.

Issue

Vol. 11 No. 2 (1960): MAUSAM

Section

Shorter Contribution

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