computer-aided design of future sensing systems, as well as aid in main- 

 taining coherent signals for underwater communication systems. 



Another field with significant applications for sea-floor roughness 

 information is physical oceanography. This requirement led to the 

 extensive work of T. H. Bell. Planetary Rossby waves are strongly 

 affected by bottom roughness in long wavelengths (Rhines and Bretherton, 

 1973). The propagation of long surface waves such as tides and tsunamis 

 are also affected (Rhines, 1977). Bell (1973, 1975a) showed that the 

 interaction of deep ocean currents and bottom topography may lead to the 

 generation of Internal gravity waves in the oceans, a major influence in 

 ocean dynamics as well as submarine operations. 



Another geophysical application is in the general field of survey 

 design. Davis (1974) has formulated a method which, with a knowledge of 

 the spectral content of the field being measured, allows a predetermined 

 survey accuracy to be attained. Briefly, the two-dimensional (or in 

 some applications, three-dimensional) spectral content estimates are 

 used In algorithms which prescribe preferred track spacing, sampling in- 

 tervals and track^orientation. The method has been successfully applied 

 to gravity, magnetic and physical oceanographlc surveys. The availabil- 

 ity of an adequate spectral content model for submarine topography would 

 make this technology available for ba thyme trie survey design. 



In the detection of anomalous features in a field, the "normal" 

 background variability must be removed by filtering to aid detection. 

 This method has been applied successfully in magnetic anomaly detection 

 and theoretically could be applied to bathymetrlc anomaly detection. 

 McDonald, Ratz and Eaas (1966) applied this concept to submarine detec- 

 tion, specifically In the search for the nuclear submarine Thresher. 



