当地降水量的多年周期性变化决定了地下水位的多年动态。
The dynamic variations of groundwater level are subject to cyclic variation of precipitations.
海潮及受其影响的海岸带地下水位具有复杂的周期性变化和趋势性变化。
Complex periodic changes and trending changes can be observed in tide and groundwater level affected by the tide in coastal aquifers.
这种影响特征具有典型的周期性和滞后性，通过对坡体地下水位的动态模拟，取得了边坡稳定性随时间而变化的规律认识。
The characteristics of the effects have typic period and delay features. We obtained the law of slope stability with changing time by dynamic simulation to groundwater level of the slope.
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