游泳中的鴨子不會產生單一波長的水波。 相反,它會發出波長略有不同的水波,繼而產生複雜疊加 (superposition)。 因此,我們需要討論這些波群 (groups of waves) 如何在水面上傳播。
Translated from https://www.phikwadraat.nl/duck_wakes/
Because of interference, waves (blue circles) generated by the duck at different times (e.g. points A and B) will not be cancelled out only at specific positions (e.g. red lines).
只要符合足夠水深的要求,這條「尾巴」的形狀和角度不受波動源頭的質量、速度或地點影響。
As long as water is deep enough, the shape and angle of this wake is independent of the mass, speed or location of the wave source.
Information from https://www.hko.gov.hk/education/article_e.htm?title=ele_00387
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