大亚湾的潮汐动力学研究--I.潮波系统的观测分析与数值模拟

发布时间：2018-05-24 07:05

本文选题：大亚湾 + 潮波系统　；参考：I.潮波系统的观测分析与数值模拟

【摘要】：文章作为大亚湾潮汐动力学系列研究的第一部分,展现了大亚湾水动力的最新观测结果,并借助于不规则三角网格海洋模式建立了高时空分辨率的三维潮汐潮流数值模型,重现大亚湾潮位和潮流变化状况。结合实测资料与模拟结果,得到了较以往更为精细的大亚湾潮波系统特征。浅水分潮,尤其是六分之一日分潮在大亚湾内快速增长,成为大亚湾潮波系统的显著特征。在大亚湾范和港M_6分潮振幅达到与M_4、S_2分潮相同的量级。大亚湾外开阔海域的潮流以旋转流为主,但进入湾内后潮流椭圆迅速扁平化,往复流占据主导。在湾内主要潮流通道内,M_6潮流椭圆主轴流速超过了M_4和K_1分潮。潮能通量分析揭示了大亚湾内高频分潮的强耗散,M_6分潮的能量耗散率和半日周期内耗散的总能量均超过了M_4、M_2和K_1分潮。观测到的欧拉余流表现出其湾内不一致的大小潮变化以及湾外所受沿岸流的影响。模拟出的欧拉余流则揭示了大亚湾内的余流多涡旋结构和水体弱交换能力。
[Abstract]:As the first part of the series of tidal dynamics in Daya Bay, this paper presents the latest observational results of hydrodynamics in Daya Bay, and establishes a three-dimensional tidal current numerical model with high spatial and temporal resolution by means of irregular triangular grid ocean model. The tidal level and tidal current changes in Daya Bay are repeated. Combined with the measured data and simulation results, the characteristics of Daya Bay tidal wave system are obtained. Shallow water tide, especially one-sixth tide, increases rapidly in Daya Bay, which is a remarkable feature of tidal wave system in Daya Bay. In Daya Bay, the amplitude of M _ S _ 6 is of the same order of magnitude as that of M _ s _ 4 / S _ 2. The main tidal current in the open sea area outside Daya Bay is the rotational current, but the tidal current ellipse becomes flat quickly after entering the bay, and the reciprocating current dominates. In the main tidal current channel in the Bay, the current velocity of the main axis of M _ S _ 6 is higher than that of M _ S _ 4 and K _ S _ 1. The analysis of tidal energy flux reveals that the energy dissipation rate of M6 tide and the total energy dissipation in half-day period of M6 tide in Daya Bay are higher than those of M4M2 and K-1 tide in Daya Bay. The observed Euler residual currents show inconsistent tidal variations in the bay and the effects of the coastal currents outside the bay. The simulated Euler residual current reveals the multi-vortex structure and weak water exchange capacity of the residual flow in Daya Bay.
【作者单位】：中国海洋大学海洋与大气学院;中国海洋大学物理海洋教育部重点实验室;
【基金】：国家重点基础研究发展计划(2015CB452905) 中国博士后科学基金第8批特别资助(2015T80742)~~
【分类号】：P731.23

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