Similarities and differences of shallow water deformation of tidal wave in two adjacent bays: Daya Bay and Dapeng Bay

LI Song; GUAN Weibing; CAO Zhenyi; HE Tianqi; YANG Yun

doi:10.3969/j.issn.1001-909X.2020.03.004

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (3) : 31-47. DOI: 10.3969/j.issn.1001-909X.2020.03.004

Similarities and differences of shallow water deformation of tidal wave in two adjacent bays: Daya Bay and Dapeng Bay

LI Song^1,2,3, GUAN Weibing^*1,2,3,4, CAO Zhenyi^1,2, HE Tianqi^1,2, YANG Yun^1,2

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Abstract

The phenomenon of “double peak” of tidal water level in Daya Bay and Dapeng Bay was reproduced by means of the measured data, and it is determined that the abnormal growth of shallow water tide is the main cause of the phenomenon, among which the one-quarter-day tide and the one-sixth-day tide played a crucial role. The high-resolution hydrodynamic model of Daya Bay and Dapeng Bay was constructed by using the SCHISM model. The simulation shows that in the open sea outside Daya Bay and Dapeng Bay, tidal type is irregular diurnal tide in the eastern sea, tidal type is irregular semidiurnal tide in the western sea and two bays. The pattern of current is irregular semidiurnal currents in study area. The difference of hydrology between the two adjacent bays is directly caused by the deformation process of one-quarter-day and one-sixth-day tide in Daya Bay and Dapeng Bay. Through the numerical experiments of building different bottom friction intensity, eliminating bottom topography and changing water depth, it is shown that whether the direction of split tide propagation is consistent with the direction of shallower water depth is the fundamental reason that leads to the different tidal wave deformation in two bays.

Key words

Daya Bay / Dapeng Bay / shallow water tide / SCHISM

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LI Song, GUAN Weibing, CAO Zhenyi, HE Tianqi, YANG Yun. Similarities and differences of shallow water deformation of tidal wave in two adjacent bays: Daya Bay and Dapeng Bay[J]. Journal of Marine Sciences. 2020, 38(3): 31-47 https://doi.org/10.3969/j.issn.1001-909X.2020.03.004

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