潮流场永久预报方法及应用

A FORECASTING METHOD FOR TIDAL FLOW FIELD

本方法的特点是以一个假想的引潮天体来代替月球和太阳的引潮作用,用该引潮天体星下点处的引潮力作为预报指标,对海区的整个潮流场进行计算与预报。 在本方法中,把潮流场分为两种类型:把周日不等最弱的流场,称为Ⅰ型流场;把周日不等最强烈的流场,称为Ⅱ型流场。介于这两者之间的流场,则为过渡性的流场。流场的周期是与星下点处引潮力的周期相同。 本方法已运用于渤海和北黄海,提供了该海区的表层流场永久预报图,并成功地进行过多次预报。

The method presented in this paper is different from the famous harmonic method. It replaces the action of the two main heavenly bodies, the sun and the moon, with the action of a compound heavenly body, and calculates the forces caused by it. Instead of using the local tide generating force, it uses the compound generating force at the sub-stellar point. It no longer divides the tide generating force into many components but uses the resultant force. It no longer predicts the tidal current at individual points but makes a prediction of the tidal current field.In this method there are two kinds of flow fields: the one with the smallest daily inequality is defined as type Ⅰ(?) and the other with intense daliy inequality is defined as type Ⅱ .The flow fields are transitional except type Ⅰ and type Ⅱ. The period of the flow field is equal to the generating force period at the sub-stellar point.The predicting maps for the tidal current fields in the Bohai Sea and the North Yellow Sea contain only 48 pages.