Assessment of the Groundwater Renewability in Beijing Plain Area

Groundwater is the main water source of Beijing plain area. It plays a vital role in the safety of water supply. Assessment of the groundwater renewability in study area is important to its water resources sustainable utilization. In this study, 5 thematic maps including precipitation, precipitation infiltration coefficient, aquifer structure, slope and, drainage density were selected to integrate using ArcGIS software. Standardization of index values is expressed by membership function. The weights were assigned by analytic hierarchy process (AHP). The result of groundwater renewability zone shows groundwater renewability of Beijing plain area decreases from alluvial fans top to fringe and it is very low in the centre of study area for the small precipitation infiltration coefficient.