The current flowing from the north west of the bay to Jiangjunmao in surface layer then outflowing the bay along Kemen channel and the eddy in south west of bay result in the spatial difference of average half-exchange period.

• 表层由西北湾顶流向将军帽附近海域并且顺着可门水道流出湾外的余流主流和将军帽西南部的涡旋造成湾水存留期的水平分布不均匀。 风场可以影响当地的海流，因此风场的差异也会影响水交换能力。