Based on the geometry and surface in Daya Bay, we artificially divided the reclamation projects into three periods to analyze the influences and changes on hydrodynamic conditions as a result of the reclamation projects. Three periods of tidal current fields, tidal prisms, and water exchange capacity are simulated by the Finite-Volume, primitive equation Community Ocean Model and the characteristics and trends of hydrodynamics in Daya Bay are discussed. The combination of observation and simulation in this paper gives a good description on the tidal dynamic system in Daya Bay. As indicated by model results, the tidal current velocity in the Bay totally decreases after numerous activities associated with reclamation construction. The decreasing current velocity region is mainly distributed near the Xiachong and Gangkou chain islands. The current velocity in 2015 decreases by approximately 5 cm s−1 compared with velocities before 2000. Future reclamation activities will exacerbate these decreasing current velocity trends in some regions. Compared with 2015, the tidal prism has significantly decreased by 1.3622 × 107 m3 due to planned reclamation. The half-water exchange times for Daya Bay in 2015 and after planned reclamation are 178.9 and 177.4 days, respectively. The water exchange capacity in Fanhe Harbor is weaker than other water fields throughout Daya Bay.

中文翻译：

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大亚湾围填海活动引起的水动力变化

我们根据大亚湾的几何形状和地表，人为地将围垦工程分为三个时期，以分析围垦工程对水动力条件的影响和变化。用有限体积、原始方程的群落海洋模型模拟了三个时期的潮流场、潮汐棱柱和水交换能力，讨论了大亚湾水动力的特征和趋势。本文通过观测与模拟相结合，较好地描述了大亚湾的潮汐动力系统。正如模型结果所表明的那样，在与填海工程相关的大量活动之后，海湾中的潮汐流速度完全下降。流速递减区主要分布在下冲和港口链岛附近。与 2000 年之前的速度相比，2015 年的水流速度下降了大约 5 cm s−1。未来的填海活动将加剧某些地区的水流速度下降趋势。与2015年相比，由于计划围垦，潮汐棱柱显着减少了1.3622×107 m3。大亚湾2015年及拟填海后半水换水时间分别为178.9天和177.4天。番河港的换水能力弱于整个大亚湾其他水域。大亚湾2015年及拟填海后半水换水时间分别为178.9天和177.4天。番河港的换水能力弱于整个大亚湾其他水域。大亚湾2015年及拟填海后半水换水时间分别为178.9天和177.4天。番河港的换水能力弱于整个大亚湾其他水域。