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黄河口水动力作用的最显著特点是径流方向（ＷＥ）和潮流方向（ＳＮ）近于垂直。这一特点有利于三角洲的横向扩展［１］，但另一方面，由于沿岸流异常发育，加快了河口沉积速度，促进了拦门沙的发育，使河口处的河床抬高，泄流不畅，不利于黄河口外水下河道的自然下切延伸，最终诱发改道。米草生态工程可以通过防止泥沙沿岸搬运，降低海水含沙量，从而降低拦门沙的发育速度，保护黄河水下河道，最终起到降低河口变动频率，防治黄河改道的作用。
The most notable features of the hydrodynamic effects of the Yellow River Estuary are that the direction of flow (WE) and the direction of flow (SN) are near vertical. This feature is conducive to the lateral expansion of the delta [1], but on the other hand, due to the abnormal development of the coast flow, the speed of estuary sedimentation is accelerated, the development of barren sand is promoted, the riverbed at the estuary is lifted and the discharge is not smooth , Is not conducive to the natural undercutting extension of the Yellow River estuary water channel, eventually induced diversion. Miancao ecological project can prevent sediment along the shore and reduce the sediment concentration in the sea, so as to reduce the development speed of sand bar and protect the Yellow River, finally reducing the frequency of estuary and preventing the diversion of the Yellow River.