通过历史资料的验证，表明本文所建立的水均衡模型对于地下水位变动的预测是可靠的，而且简单可行。
It is proved by the verification of historical data that the water balance model is credible and easily available for the forecast of groundwater table variation.
某些湖泊的水位变动极大。
由于潮汐变化及气象等因素影响，海面水位时刻都在变动。
Due to tides and meteorological effects, the sea level is in a continuously changing state.
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