HANNA: DESIGN OF TRANSMISSION LOSS EXPERIMENTS 



Dr. Hanna: Following on that point, is it not true that Officer, 

 for example, applied exactly that kind of analysis to some of his low 

 frequency bottom reflectivity measurements? 



Dr. Mersey: Several reflectivity measurements were made that 

 way . 



I think they have a distinct fault, though. I have a funny 

 feeling in my stomach that they simply don't measure bottom loss, 

 and this has been growing on me through the evening. We did it 

 that way for several years. 



Dr. Dyer: John, it may be a little late to come back to an 

 opening philosophical point that John made. 



You said the motivation for measurements is to better understand 

 the ocean — I applaud that view. You said, also, the motivation for 

 measurement is to better build models — I applaud that view. 



Who is going to speak for those poor guys who have to design 

 systems? It's a rather different kind of motivation. And how do 

 you design programs to meet those kinds of needs? 



Dr. Mersey: Actually, Ira, I am somewhat disappointed that in 

 the main this first transient of our workshop hasn't addressed that 

 problem more than it has. 



There is no question, however, that models based on a rational 

 consideration of the influence of the environment on acoustic propa- 

 gation and the shaping of the noise field have been applied to 

 estimating the performance of systems that have not been built on 

 analysis of performance of systems that have been built. The results 

 of the latter are very weak in resolving power because of the nature 

 of an operation exercise. 



555 



