Study on the recovery process and the main controlling factors for post-storm beach profiles of a headland bay: Taking the Narrabeen Beach in Australia as an example

Feng Xi; Mao Yashi; Zhou Yingtao

doi:10.12284/hyxb2023159

Volume 45 Issue 12

Dec. 2023

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Feng Xi，Mao Yashi，Zhou Yingtao. Study on the recovery process and the main controlling factors for post-storm beach profiles of a headland bay: Taking the Narrabeen Beach in Australia as an example[J]. Haiyang Xuebao，2023, 45(12)：80–91 doi: 10.12284/hyxb2023159

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Study on the recovery process and the main controlling factors for post-storm beach profiles of a headland bay: Taking the Narrabeen Beach in Australia as an example

doi: 10.12284/hyxb2023159

Feng Xi^{1, 2, 3
,},
Mao Yashi¹,
Zhou Yingtao^{2, 3, 4}

1.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
2.
Key Laboratory of Marine Ecological Conservation and Restoration, Ministry of Natural Resources/Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration, Xiamen 361005, China
3.
Hainan Provincial Key Laboratory of Marine Geology and Environment, Haikou 570206, China
4.
Shanghai Urban Construction Design & Research Institute, Shanghai 200125, China

Received Date: 2023-05-25
Rev Recd Date: 2023-08-03

Available Online: 2023-12-29

Publish Date: 2023-12-01

Abstract

Abstract

Narrabeen Beach, located Sydney, Australia, has undergone frequent storm wave events. The beach form has an adaptive ability to evolve from storm profile to berm profile with little human intervention. In order to investigate the self-recovery capability of the headland bay after storm waves, this paper analyzes how beach evolves during the post-storm calm weathers and identify the main hydrodynamic factors that dominate the beach recovery based on the multi-year continuous measurement data of Narrabeen Beach. The results show that there are spatial differences along the shore in the recovery rates, with the fastest recovery rate in the middle of the beach. Besides, southeast breezes with small wave-height and long wave-period contribute most to the storm-profiles’ recovery, especially to the northern-to-central portion. Whilst for the southern part of the headland bay tidal force modulate the beach recovery efficiency more. Accordingly, a concept of cumulative wave energy considering tidal range is proposed by this study and found to well correlated with the self-recovery ability of the southern beach profile. Through investigation, variation of wave directions induced by topography, along with geological and geomorphological features all play a vital role on the spatial inhomogeneity of the recovery efficiency for the headland bay. In addition, from the secular time scale, the recovery ability of the storm profiles is also controlled by the Southern Oscillation Index. The analysis and findings of this paper can provide useful references for disaster prevention and mitigation, and post-disaster protection and restoration for a headland bay under extreme sea forces.
- headland beach,
- storm profile,
- recovery during calm weathers,
- self-recovery capability of a beach

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References(27)

References

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