科研之友
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摘要
Precursors are characteristic wave patterns that arise when an impulse travels through a dispersive medium. They are especially easy to observe in water waves due to their slow propagation speed and strong dispersive effects. The competing influences of gravity and surface tension mediated by the water's depth create an unusual dispersion relation that gives rise to a variety of precursors, not all of which appear in other media. A method is presented for observing precursors in water waves which is easily implemented in an undergraduate laboratory setting and which agrees with a numerical evaluation based on first principles.
- 出版日期2010-2
