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TECHNICAL BRIEF

Localized Mixing Due to an Interfacial Solitary Wave Breaking on Seabed Topography in Different Ridge Heights

[+] Author and Article Information
Chen-Yuan Chen

Department of Management Information System, Yung-Ta Institute of Technology and Commerce, PingTung County 90941, Taiwan, R.O.C.chency@mail.ytit.edu.tw

Cheng-Wu Chen

Department of Logistics Management, Shu-Te University, Yen Chau, Kaohsiung County 82445, Taiwan, R.O.C.cwchen@mail.stu.edu.tw

I-Fan Tseng

Center for Marine Technology, National Sun Yat-sen University, Kaohsiung City 80424, Taiwan, R.O.C.ifan@mail.ncku.edu.tw

J. Offshore Mech. Arct. Eng 129(3), 245-250 (Sep 12, 2006) (6 pages) doi:10.1115/1.2426991 History: Received October 24, 2005; Revised September 12, 2006

Experiments were carried out in a wave flume on internal solitary wave (ISW) of depression-type propagating over a submarine ridge in triangular shape. Tests were arranged in series from combinations of submarine ridges in different height and ISW in different wave amplitudes. The resultant wave motions were found differing from that of surface gravity waves. Experimental results suggested the blockage parameter ζ can be applied to classify various degrees of ISW–ridge interaction, i.e., ζ<0.5 for weak encounter, 0.5<ζ<0.7 for moderate encounter, and 0.7<ζ for wave breaking. In addition, three categories of ISW–ridge interaction were also employed by the relationship between the degree of blocking B and dimensionless wave amplitude aiH2.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic view showing the laboratory setup for internal wave propagation and reflection from submarine ridge in a two-layer fluid system

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Figure 2

List of ridge height used in the present study

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Figure 3

Sequential events showing an ISW of depression-type transmitted over an isolated triangular ridge. Each square was 5×5cm, depth ratio of upper to bottom layer was H1∕H2=10∕40 (in centimeters).

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Figure 4

Sequential events showing an ISW of depression-type transmitted over an isolated triangular ridge. Each square was 5×5cm, depth ratio of upper to bottom layer was H1∕H2=20∕30.

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Figure 5

Sequential events showing an internal breaking of an ISW of depression type transmitted over an isolated triangular ridge. Each square was 5×5cm, depth ratio of upper to bottom layer was H1∕H2=10∕40 (in centimeters).

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Figure 6

Physical variables for calculating the wave celerity of an ISW of depression type

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Figure 7

Experimental outcome of dimensionless wave speed and blockage parameter ζ, in which ∘ stands for weak wave-ridge encounter; ◻ for the moderate encounter; and * for wave breaking

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Figure 8

Relationship between the degree of blocking and dimensionless wave amplitude for three categories of wave–ridge encounter

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