question of water based on fast fourier transform

ccanan

Newcomer
simply speaking, in tessendorf's paper it says in the following fuction(function 19 in the paper)

392494_1277217509Yu7H.jpg


(if the image can't be displayed, check this link: http://hi.csdn.net/attachment/201006/22/392494_1277217509Yu7H.jpg)

k is the vector of water moving, then he gives a phillips spectrum.
can anyone explain why k can represent water move vector?

thx a lot!
 
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