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The Use of Hydrodynamic Models in the Determination of the Chart Datum Shape in a Tropical Estuary

机译:使用流体动力学模型在热带河口中的图表基准形状的确定

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摘要

Estuaries are transitional environments with ideal conditions for port construction and navigation. They represent a challenge to hydrographic services due to the dynamics of the seabed and the tidal wave deformation. The bottom slope, the convergence of the channels, and the nonlinear effects produced by the bottom friction produce variation in both the tidal range and the location of the chart datum (CD). In this study, sea level data series obtained from the nodes of the mesh of a hydrodynamic model (virtual tide gauges) were used to calculate the harmonic constituents, form factor, asymmetry, and estuary type. The final chart datum surface, obtained from the hydrodynamic model, was used to determine the separation values between zones and also the number of tidal zones in an estuarine system. It was found that in a complex hydrodynamics scenario, the use of the ellipsoidal referenced surveying (ERS) method is more convenient than traditional tidal zoning survey. In the ERS method, once the CD model is complete, it must be attached to the ellipsoid directly. Finally, the variation of the CD in different scenarios (due to anthropogenic action) was assessed.
机译:河口是过渡环境,具有港口建设和导航的理想条件。由于海底和潮汐变形的动态,它们代表了对水文服务的挑战。底部斜率,通道的收敛,以及由底部摩擦产生的非线性效果产生潮汐范围和图表基准(CD)的位置的变化。在该研究中,使用从流体动力学模型(虚拟潮汐仪)的网的节点获得的海平数据系列来计算谐波成分,形状因子,不对称性和浅沟。从流体动力学模型获得的最终图表基准表面用于确定区域之间的分离值以及偏卤素系统中的潮汐区的数量。结果发现,在复杂的流体动力学场景中,使用椭圆虫参考测量(ERS)方法比传统的潮汐分区调查更方便。在ERS方法中,一旦CD模型完成,它必须直接连接到椭圆形。最后,评估不同情景(由于人为动作)的CD的变异。

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