Laboratory study of solitary wave transformation and run-up over reefs with large reef roughness

Yang Xiaoxiao; Yao Yu; Guo Huiqun; Jia Meijun

doi:10.12284/hyxb2021053

Volume 43 Issue 3

Apr. 2021

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Yang Xiaoxiao，Yao Yu，Guo Huiqun, et al. Laboratory study of solitary wave transformation and run-up over reefs with large reef roughness[J]. Haiyang Xuebao，2021, 43(3)：24–30 doi: 10.12284/hyxb2021053

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Laboratory study of solitary wave transformation and run-up over reefs with large reef roughness

doi: 10.12284/hyxb2021053

Yang Xiaoxiao^1
,,
Yao Yu^{1, 2
,
,},
Guo Huiqun¹,
Jia Meijun¹

1.
School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China
2.
Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China

Received Date: 2020-02-12
Rev Recd Date: 2020-05-08

Available Online: 2021-03-24

Publish Date: 2021-04-23

Abstract

Abstract

A series of laboratory experiments is carried out in a wave flume to study the influence of rough reef surface on solitary wave transformation and run-up over coral reefs. The cylinder array is used to model the reef surface with large roughness. The results show that the rough reef surface significantly reduces the leading solitary wave and the secondary wave due to beach-reef beach reflection, as well as the wave speed on the reef flat. The relative cross-shore wave height decreases with the increase of dimensionless incident wave height along the reef. It also increases with the increase of reef-flat wave level. The cross-shore wave height attenuation is more evident with the rough reef surface. The variation of dimensionless reflected wave height with the dimensionless incident wave height depends on the reef-flat wave level. The dimensionless reflected wave height approaches to a constant when the incident wave height is sufficient large. The rough reef surface slightly enhances the wave reflection from the fore-reef slope. The dimensionless transmitted wave height as well as wave run-up decline with the increasing dimensionless incident wave height, particularly for the large reef-flat water level. The dimensionless wave run-up on the back-reef beach with the rough reef surface reduces by an average of 46% compared to that with the smooth surface. An empirical formula is obtained by a regression analysis to predict the wave run-up with both smooth and rough reefs.
- coral reef,
- solitary wave,
- artificial roughness,
- wave run-up

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References(13)

References

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