Study on Groundwater Change on the Aberrance Condition in Hubao Plain,Inner Mongolia,China

The influences on groundwater resource,flow and water table change with time due to climate aberrance are focused on in Hubao Plain, Inner Mongolia,China.Based on the hydrogeologic conceptual model,a dual layers' groundwater numerical model was built up in the study area with groundwater modeling software PMWIN 5.1,and the model was calibrated by means of simulating water table curves and flow net in 1998.The two extra drought periods were defined as a groundwater aberrance condition by analyzing rainfall of recent 51 years,and the groundwater states were simulated by the model on the aberrance condition.The result shows:(1)Groundwater over-pumping in the extreme results in a groundwater storage decrease of 752.963 4×10~(6)m~(3).(2)Water tables in unconfined and confined aquifers depress in large extend.The maximum drawdown in unconfined aquifer is about 4 m,and in confined aquifer is about 17 m.The centers of drawdown are located at the downtowns of Huhehaote and Baotou,in which groundwater is extremely over-developed.