Mapping Tidal Harmonic Constant Map from Vung Tau – Bac Lieu, Viet Nam by Using a Numerical Model in Curvilinear Coordinate

Harmonic constituents are used to predict tide levels, each constituent represents a distinct factor contributing to the tidal regime. In this paper, a hydraulic model in the curvilinear coordinates is applied to simulate eight tidal constituents (M2, S2, O1, K1, N2, K2, P1 and Q1 from Vung Tau to Bac Lieu, Vietnam. The hydraulic model with the two-dimensional orthogonal curvilinear grid has the advantage of increasing the accuracy in the results at the domain boundary. The numerical method of this model derives from the solution of the Reynolds system of equations averaged over the depth in the curvilinear coordinate systems. The model verification is implemented based on the equilibrium of the tidal currents of energy. The results of this model are used to mapping tidal constituents from Vung Tau to Bac Lieu, Vietnam. From Vung Tau to Bac Lieu, the amplitude and phase values of the tidal constituents K1 are higher than those from Vung Tau to Tra Vinh and approximately as high as those in Bac Lieu with the amplitude of 0.5 m and a phase range from 3450 to 3500. Meanwhile, the amplitude values of the constituent O1 fluctuate within the value of 0.3 m–0.31 m, the phase values are in the range 2700−2850. The values of the constituent M2 is the highest (0.8 m–0.9 m) which is double that of the constituent S2.