Digital filter simulating hydroacoustic signal distortion
I wouldn’t bother much with the precise shape of the filter because any real passive sonar will boost the higher frequencies at the receiver and any realistic source levels are going to around 70 years old and most likely a double screw, and aspect dependent. Cavitation is depth dependent. A single pole low pass filter with a corner around 10 Hz is probably ok.

Fidelity is one of those things that can become an obsession. There is ambient noise and self noise associated with hydro acoustic flow.  Higher frequencies exhibit hull shading.  No one band covers all the signal types of interest. 

If you want to be obsessive, look at Mike Porter's Ocean Acoustics web site.

http://oalib.hlsresearch.com/

I'm partial to RAM PE and there at least was a broad band (decomposition of narrow band) demo for the MATLAB version.   

There was a video game that came out around 20 years ago that collaborated with a company named SONOLYST.  They actually got an Oscar for sound effects for the Hunt for Red October movie. 

I like Urick.  I actaully meet him a few times and took a week long class from him but you might find Ross a bit more helpful.

Mechanics of Underwater Noise, Ross, D. isbn={9781483160467},
  url={https://books.google.com/books?id=sdwgBQAAQBAJ, 2013, Elsevier Science