在渤海三维水动力模型的基础上,利用质点追踪方法对渤海水交换进行了研究。采用水体更新时间作为衡量水交换的标准,经计算得到渤海的平均水体更新时间为1 181.7 d。通过分析渤海的剩余质点比例曲线发现,初始位于渤海的物质量随时间的变化可分解为年际尺度上的指数衰减信号和1 a周期的震荡信号,其中年内震荡信号与河流总流量存在显著相关关系。通过指数曲线拟合分析,90%的渤海质点交换至渤海外部需要2 707 d。 Based on the three-dimensional hydrodynamic model of Bohai Sea, the water exchange in the Bohai Sea was studied by using the particle tracing method. The water renewal time is used as a measure of water exchange, and the average renewal time of water in Bohai Sea is calculated to be 1 181.7 days. By analyzing the ratio curves of the remaining particles in the Bohai Sea, it is found that the initial mass flow in the Bohai Sea can be decomposed into exponential decay signals and 1-cycle turbulent signals on the interannual scale, with the significant correlation between the turbulent signals and the total flow of the river during the year relationship. By exponential curve fitting analysis, 90% of the Bohai Sea mass exchange to the outside of Bohai Sea takes 2 707 days.