How can I create ripple effect like when a helicopter is flying above a
water surface?  I could use the "ripples" pattern but I don't want the whole
water surface to become rippled.  I want the ripples to gradually fade away
from the center.  I also don't want the ripples to originate exactly from
the center because that is not realistic when a helicopter is flying
overhead.  The ripples should around the perimeter of the helicopter.

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