Download Computational Ocean Acoustics by Finn B. Jensen, William A. Kuperman, Michael B. Porter, PDF
By Finn B. Jensen, William A. Kuperman, Michael B. Porter, Henrik Schmidt
Since the mid-1970s, the pc has performed an more and more pivotal position within the box of ocean acoustics. speedier and cheaper than genuine ocean experiments, and able to accommodating the total complexity of the acoustic challenge, numerical types are actually general examine instruments in ocean laboratories.
The growth made in computational ocean acoustics over the past thirty years is summed up during this authoritative and innovatively illustrated new textual content. Written via a number of the field's pioneers, all Fellows of the Acoustical Society of the United States, Computational Ocean Acoustics provides the newest numerical strategies for fixing the wave equation in heterogeneous fluid–solid media. The authors talk about quite a few computational schemes intimately, emphasizing the significance of theoretical foundations that lead on to numerical implementations for actual ocean environments. To extra make clear the presentation, the elemental propagation positive factors of the suggestions are illustrated in color.
Computational Ocean Acoustics conveys the cutting-edge of numerical modeling thoughts for graduate and undergraduate scholars of acoustics, geology and geophysics, utilized arithmetic, and ocean engineering. it's also a necessary addition to the libraries of ocean study associations that use propagation models.
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Extra resources for Computational Ocean Acoustics
29) to be M D 5. The transmission loss versus range 20 1 Fundamentals of Ocean Acoustics ~ 40 log r 20 log r Fig. 9 Nearfield surface-interference (Lloyd mirror) solution for point source in a homogeneous halfspace for a 200-m deep receiver is shown in Fig. 19). Note the oscillating field structure with five peaks and a farfield decay proportional to 40 log r. The Lloyd-mirror interference pattern is a characteristic feature of deep-water propagation which shall be repeatedly referred to in this book.
40) where ı is called the loss tangent. 41) where ˛ 0 is in dB/m (if x is in meters) and should be multiplied by 1000 to be in units of dB/km. z/. 42) we see that for ci2 sound speed is related to the attenuation in nepers/m as ci ' ˛ 2 c D ı cr : ! 43) 36 1 Fundamentals of Ocean Acoustics Implicit in this treatment is that attenuation is linear with frequency (which is not always the case but can be appropriately addressed–see the discussion below on attenuation in seawater). f / in units dB/(m kHz).
Moreover, the portion of the source power trapped in the waveguide is directly proportional to the aperture of ray angles propagating as internally refracted rays. For a source on the axis (Fig. c0 =cmax /, where c0 is the sound speed at the channel axis (minimum speed) and cmax is the maximum speed encountered between the channel axis and the sea surface (normally at the bottom of the mixed layer). For the Norwegian Sea profile shown in Fig. 12, the maximum source aperture is ˙10ı (steeper rays will be surface-interacting).