Abstract
The construction of a Giant Sea Wall (GSW) complex in Jakarta Bay has been proposed to protect Jakarta against flood in the Master Plan for National Capital Integrated Coastal Development (NCICD). However, these large-scale hydraulic structures could significantly change the tidal dynamics in Jakarta Bay. This research investigates the potential impacts of a GSW on the tidal dynamics, including tides, currents, and residual currents in Jakarta Bay using a validated numerical model (Finite Volume Coastal Ocean Model (FVCOM)). Results show that the bay is diurnal with a maximum tidal range of ~0.9 m. The flow is mainly in an east-west direction with a maximum depth-mean current speed of up to 0.3 ms−1. The construction of a GSW would modulate the tidal dynamics by changing the bathymetry, tidal prism, wind effect, and tidal choking effect in the bay. The maximum tidal range would be slightly increased due to the reduced tidal prism of the bay and the increased tidal choking effect. The current would penetrate into the west reservoir through the gates and channels between the artificial islands, with peak speed jets appearing at the gates (~0.3 ms−1), due to tidal choking. A similar peak current speed appears near the right wing of the GSW due to the pressure gradient would be created by the wing of the GSW. Closing the gates would mainly affect the currents inside the west reservoir. The residual current would be slightly increased after the construction of the GSW. An eddy would be formed at the bottom level near the right wing of the GSW. The direction of the residual current is landward instead of seaward at the surface level outside the GSW. The impact of wind on surface currents would be much reduced due to the decreased water surface area. Although this study is site specific, the findings may have a wider applicability to the impacts of large-scale hydraulic structures on tidal dynamics in open-type bays.
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Acknowledgements
This study was partially supported by the National Key Research and Development Program of China (2017YFC1405101), Fundamental Research Funds for the Central Universities (2017XZZX001-02A), and Natural Science Foundation of Zhejiang Province (LR16E090001). AR was supported by a scholarship from Zhejiang University for a Master degree program at Ocean College of Zhejiang University, China. We also thank the Ministry of Public Works, Indonesia, for providing the tide, current, and bathymetry data.
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Responsible Editor: Lie-Yauw Oey
This article is part of the Topical Collection on the 9th International Workshop on Modeling the Ocean (IWMO), Seoul, Korea, 3-6 July 2017
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Rusdiansyah, A., Tang, Y., He, Z. et al. The impacts of the large-scale hydraulic structures on tidal dynamics in open-type bay: numerical study in Jakarta Bay. Ocean Dynamics 68, 1141–1154 (2018). https://doi.org/10.1007/s10236-018-1183-3
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DOI: https://doi.org/10.1007/s10236-018-1183-3