I will continue my slightly creative use of dBSea in this post.
When a porpoise has to echolocate for fish (Nemo) they face a series of challenges, even before taking into account that the fish can swim away.
Harbour porpoises use very high frequency clicks to locate their prey. Kyhn et al. 2013 has some fine data on the clicks they produce, they present the following spectrogram for a Danish harbour porpoise:
|Figure 1. Time series and spectrogram from a harbour porpoise click.|
In dBSea we can model the range a porpoise should be able to pick out for example a sprat. They are a nice size for the porpoises, measuring about 12 cm.
|Figure 2. European sprat, Wikipedia|
|Figure 3. An "omnidirectional" porpoise transmitting a click like the one in Figure 1. Fish echo A: Echo in sea state 4, B: Echo in sea state 4 weighted for porpoise hearing, C: Echo in a quiet ocean.|
Nevertheless I think this is another interesting way of utilising dBSea for other purposes than strict noise modelling and I sincerely hope that some marine scientist will have a go at something similar, maybe using dBSea?
Thanks for reading!
Kyhn, L. A., Tougaard, J., Beedholm, K., Jensen, F. H., Ashe, E., Williams, R., & Madsen, P. T. (2013). Clicking in a Killer Whale Habitat: Narrow-Band, High-Frequency Biosonar Clicks of Harbour Porpoise (Phocoena phocoena) and Dall’s Porpoise (Phocoenoides dalli). PLoS ONE, 8(5), e63763. http://doi.org/10.1371/journal.pone.0063763