Research Papers: Ocean Engineering

Sediment Transport Calculation Considering Laminar and Turbulent Resistance Forces Caused by Infiltration/Exfiltration and Its Application to Tsunami-Induced Local Scouring

[+] Author and Article Information
Tomoaki Nakamura

Designated Associate Professor
Institute for Advanced Research
Nagoya University,
Furo-cho, Chikusa-ku
Nagoya 464-8601, Japan
e-mail: tnakamura@nagoya-u.jp

Norimi Mizutani

Department of Civil Engineering,
Nagoya University,
Furo-cho, Chikusa-ku
Nagoya 464-8603, Japan
e-mail: mizutani@civil.nagoya-u.ac.jp

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 24, 2013; final manuscript received October 13, 2013; published online December 16, 2013. Assoc. Editor: Colin Leung.

J. Offshore Mech. Arct. Eng 136(1), 011105 (Dec 16, 2013) (9 pages) Paper No: OMAE-13-1072; doi: 10.1115/1.4025873 History: Received July 24, 2013; Revised October 13, 2013

A sediment transport calculation was proposed, which consistently considered the influence of laminar and turbulent resistance forces caused by infiltration/exfiltration. From a comparison of the nondimensional bed–load sediment transport rate, it was found to be essential to consider both laminar and turbulent resistance forces when formulating the influence of infiltration/exfiltration in sediment transport calculations. A three-dimensional coupled fluid–structure–sediment interaction model was improved using the proposed sediment transport calculation, and applied to tsunami-induced local scouring around an inland structure. Numerical results showed that consideration of infiltration/exfiltration improved the computational accuracy of the prediction of a scour hole formed around the seaward edge of the structure, and accordingly the improved model could capture the evolution of the scour hole with sufficient accuracy. This suggests that the improved model should be a useful tool for assessing tsunami-induced local scouring.

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Grahic Jump Location
Fig. 1

Forces acting on a sediment particle in the critical state (Fw ≤ W)

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Fig. 2

Forces acting on a sediment particle in bed–load motion: (a) Fw ≤ W and (b) Fw > W

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Fig. 3

Nondimensional bed–load sediment transport rate q*

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Fig. 4

Ratio of the nondimensional bed–load sediment transport rate q*

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Fig. 5

Computational domain for the steady uniform flow

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Fig. 6

Comparison of the nondimensional bed–load sediment transport rate q*

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Fig. 7

Computational domain for the tsunami scouring

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Fig. 8

Comparison of the wave field for B = 0.14 m: (a) the water surface elevation η in front of the seawall; and (b) the excess pore–water pressure pe inside the sand bed

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Fig. 9

Final scour depth zsf for B = 0.14 m: (a) the experimental data [7]; (b) with the influence of infiltration/exfiltration; and (c) without the influence of infiltration/exfiltration

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Fig. 10

Final scour depth zsf for B = 0.10 m: (a) the experimental data [7]; (b) with the influence of infiltration/exfiltration; and (c) without the influence of infiltration/exfiltration

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Fig. 11

Time series of the maximum scour depth zsmax for B = 0.14 m

Grahic Jump Location
Fig. 12

Evolution of the scour hole for B = 0.14 m: (left: numerical results with the effect of infiltration/exfiltration; right: experimental data [7]): (a) the time at which the run-up tsunami reached the seaward surface of the structure; (b) after 0.5 s; (c) after 1.0 s; (d) after 1.5 s; (e) after 2.0 s; and (f) after 3.0 s



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