title: Resonant interaction of acoustic waves with subaqueous bedforms: Sand dunes in the South China Sea.
abstract: The large subaqueous sand dunes in the South China Sea are expected to produce the coupling of energy between acoustic normal modes. In this letter, resonant interaction between acoustic propagating modes and subaqueous bedforms are numerically investigated as a function of bedform wavelength, acoustic frequency and bedform packet length. The results demonstrate that bedform wavelength impacts acoustic mode coupling behavior, with the principal transfer of energy occurring between acoustic modes whose eigenvalue difference is equal to the peak value in the bedform wavenumber spectrum. The observed effect of wavelength is greater than that of acoustic frequency and bedform packet length.
authors.affiliation: Institute of Undersea Technology, National Sun Yat-sen University, No. 70, Lienhai Road, Kaohsiung 80424, Taiwan linus@mail.nsysu.edu.tw.
authors.forename: Linus Y S
authors.initials: LY
authors.lastname: Chiu
authors.affiliation: Asia Pacific Ocean Research Center, National Sun Yat-sen University, No. 70, Lienhai Road, Kaohsiung 80424, Taiwan andreachang@staff.nsysu.edu.tw.
authors.forename: Andrea Y Y
authors.initials: AY
authors.lastname: Chang
authors.affiliation: Department of Oceanography, Naval Postgraduate School, 833 Dyer Road, Monterey, California 93943, USA dbreeder@nps.edu.
authors.forename: D Benjamin
authors.initials: DB
authors.lastname: Reeder