Research on changes and prediction of trend of the groundwater regime in Hohhot

Based on formation of groundwater and its affecting factors and consideration of the hydrogeological conditions,groundwater regime types in the study area are examined.The groundwater regime of the phreatic aquifer mainly belongs to subsurface runoff and exploration type,infiltration-subsurface runoff and exploration type,while the groundwater regime of the confined aquifer is of subsurface runoff and exploration type.On the basis of analyses of groundwater levels,a groundwater level dynamic trend model is established with BP network,and the characteristics of groundwater level change and the expansion trend of the depression cone of are predicted.