Preprints
https://doi.org/10.5194/egusphere-2024-294
https://doi.org/10.5194/egusphere-2024-294
13 Feb 2024
 | 13 Feb 2024
Status: this preprint is open for discussion.

Tide-Surge Interaction near Singapore and Malaysia using a Semi-empirical Model

Zhi Yang Koh, Benjamin S. Grandey, Dhrubajyoti Samanta, Adam D. Switzer, Benjamin P. Horton, Justin Dauwels, and Lock Yue Chew

Abstract. Tide-surge interaction (TSI) plays a substantial role in determining the characteristics of surges over shallow regions. A variety of approaches have been used to study TSI globally, and TSI have been found to occur in Singapore and the east coast of Peninsular Malaysia. However, the characteristics of TSI in Singapore and the east coast of Peninsular Malaysia have yet to be studied in detail. We study the TSI at seven tide gauges along the east coast of Peninsular Malaysia and Singapore. Here, we propose a modified statistical framework that accounts for irregularity in the tidal cycle. We find evidence of TSI at all seven locations, with characteristics varying smoothly along the coastline: the highest non-tidal residuals are found to occur most frequently before tidal high water at the southern region of this coastline and in Singapore, both before and after tidal high water in the middle of the coastline, and after tidal high water at the northern region. We also propose a semi-empirical model to investigate the effects of tidal phase alteration, which is one the mechanisms of TSI. Results of our semi-empirical model reveal that tidal phase alteration caused by wind-driven surges is substantial enough to generate significant change in the timing of the largest surges.

Zhi Yang Koh, Benjamin S. Grandey, Dhrubajyoti Samanta, Adam D. Switzer, Benjamin P. Horton, Justin Dauwels, and Lock Yue Chew

Status: open (until 09 Apr 2024)

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Zhi Yang Koh, Benjamin S. Grandey, Dhrubajyoti Samanta, Adam D. Switzer, Benjamin P. Horton, Justin Dauwels, and Lock Yue Chew

Data sets

TSI-SGMY: Analysis Code for "Tide-Surge Interaction near Singapore and Malaysia using a Semi-empirical Model" Zhi Yang Koh https://doi.org/10.5281/zenodo.10570584

Zhi Yang Koh, Benjamin S. Grandey, Dhrubajyoti Samanta, Adam D. Switzer, Benjamin P. Horton, Justin Dauwels, and Lock Yue Chew

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Short summary
Identifying tide-surge interaction (TSI) can be a complex task. We enhance existing statistical methods with a more robust test that accounts for complex tides, and investigate the influence of tidal phase alteration on TSI using a semi-empirical model. We apply these techniques to tide-gauge records from the east coast of Singapore and Malaysia. We found TSI at all studied locations, and that tidal phase alteration can change the timing of large surges with minimal impact on their height.