Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 20 - Think and Explain: 46

Answer

The wavefronts are still circular.

Work Step by Step

Try it and see! The waves are formed in the reference frame of the water. The water (and the circular waves) simply travel downstream together. Here's another way to look at it. Picture a moving cruise ship, with a child tossing a toy into the onboard pool, which makes circular waves. From the viewpoint of an observer on shore, this is analogous to the situation described in this question.
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