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在σ坐标下建立了一包括诊断计算、半诊断计算及预报计算的数值模式，并应用于东海环流的计算。计算结果表明，当ｔ＝２３ｄ时，密度场和速度场得到调整，即得到半诊断解，当ｔ＝６０ｄ以后，解已达到准稳定态。比较诊断、半诊断及预报计算的结果，它们在定性上是一致的，但是，在定量上有些变化。例如，（１）比较诊断计算与半诊断计算的结果，经过调整后的半诊断计算结果，黑潮主流仍位于２００～１０００ｍ坡折处，但流幅变窄，平均流速增大，主流更为清晰，更能反映坡折地形的影响，其次，在南边界附近的黑潮入侵陆架的黑潮分支，即黑潮主流以西的台湾暖流外侧分交的流速有所减小。关于垂向速度ｗ，半诊断计算得到的ｗ分布在大部分区域上升流或下降流有所增加；（２）比较半诊断计算与预报计算，在计算区域的南部及北部，无论是水平速度、垂向速度还是水位场分布都稍有变化。
A numerical model including diagnostic calculation, semi-diagnostic calculation and prediction calculation is established under the σ coordinate and applied to the calculation of the circulation in the East China Sea. The calculation results show that when t = 23d, the density field and velocity field are adjusted to obtain the semi-diagnostic solution. After t = 60d, the solution has reached the quasi-steady state. Comparing the results of diagnostic, semi-diagnostic and predictive calculations, they are qualitatively consistent, however, with some quantitative changes. For example, (1) comparing the results of the diagnostic and semi-diagnostic calculations. After the adjusted semi-diagnostic calculation results, the mainstream of the Kuroshio is still located at a slope of 200-1000 m, but the flow rate becomes narrower and the average flow rate increases And more clearly reflect the impact of the slope-breaking topography. Secondly, the flow velocity of the Kuroshio branch of the Kuroshio-Kuroshio shelf near the southern boundary, that is, the outer part of Taiwan’s warm current west of the mainstream of the Kuroshio, is reduced. With regard to the vertical velocity w, the w distribution calculated by the semi-diagnosis increases in ascending flow or descending flow in most areas; (2) Compared with the semi-diagnosis calculation and forecast calculation, in the southern and northern parts of the calculation area, no matter the horizontal velocity, Vertical velocity or water field distribution are slightly changed.