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    Posted April 11, 2014 by
    AndrewSoper
    Location
    Grahamstown
    Assignment
    Assignment
    This iReport is part of an assignment:
    Malaysia Airlines Flight 370

    More from AndrewSoper

    Flight MH 370

     
    Further to my suggestions about the "positions" published by JAC I understand that sound signals may be reflected from the ocean surface or warm-cooler water interfaces thus allowing the TPL to receive signals at greater distances. In other words the scatter in the positions as reported by JAC is not surprising.

    The range of 2 miles for the TPL is probably for a pinger and TPL in a homogenous water body. The sound would attenuate according to the square of the distance from the source. With inhomogeneous water characteristics the wavefront may become linear (not circular) and travel much further without major loss of intensity. Such phenomena are known as thermoclines.

    Let me know if you would like some graphics. If you find my comments interesting I suggest that you run them past people involved in deploying underwater instrumentation (current meters). Woods Hole would be the perfect place to start.

    Andy
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