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A numerical study of tidal bores
Ningsih N.S.a, Siddiq N.L.a, Tarya A.a
a Research Group of Oceanography, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© Published under licence by IOP Publishing Ltd.A tidal bore is a natural phenomenon forming a positive surge upstream and it has a remarkable effect on estuary zones and river ecologies. The tidal bore formation controlled by channel properties, tidal characteristics, and river discharge remains a research challenge. In this study, a tidal bore formation and its hydrodynamics characteristics have been numerically investigated by using a two-dimensional version of OpenFOAM (Open Source Field Operation and Manipulation) model to obtain a better understanding of the effects of flow velocity before arrival of the bore (V 1), initial water depth (d 1), and Froude number (Fr) on the propagation of the tidal bore. The numerical simulation results have confirmed earlier findings obtained under both field and laboratory data in which types of the tidal bores depend on the Froude number. An undular tidal bore occurs when 1 ≤ Fr < 1.25, while partially breaking undular bore appears for 1.25 ≤ Fr < 1.5 – 1.6. Further simulation results have revealed that the flow velocity before the bore passage (downstream flow or V 1) is more dominant than the initial water depth in affecting the Froude number. Meanwhile, the bore celerity (U b ) is more affected by the initial water depth compared to the flow velocity before the bore arrival. It is found that the Froude number does not directly affect wave parameters of the bore, such as amplitude, length, period, and steepness of the wave. However, the wave length and period are directly proportional to the initial water depth, whereas the wave amplitude and steepness are associated with the velocity prior to the bore passage.[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Author keywords" size="size-sm" text_align="text-left"][vc_column_text]Channel property,Field operation,Hydrodynamics characteristics,Laboratory datum,Natural phenomena,Research challenges,Undular tidal bores,Wave parameters[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Indexed keywords" size="size-sm" text_align="text-left"][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="Funding details" size="size-sm" text_align="text-left"][vc_column_text]We greatly appreciate assistance from Y. S. Putra who has given insight and knowledge how to use the OpenFOAM model. His contribution has been invaluable. Parts of this research were funded by ITB (Bandung Institute of Technology) P3MI Research 2018. We gratefully acknowledge the ITB supports.[/vc_column_text][vc_empty_space][vc_separator css=".vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}"][vc_empty_space][megatron_heading title="DOI" size="size-sm" text_align="text-left"][vc_column_text]https://doi.org/10.1088/1742-6596/1245/1/012059[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]