Groundwater numerical modeling is the essential technique of groundwater movement research and groundwater resource assessments. By modeling the groundwater movement of Beijing, By the first joint modeling of Beijing groundwater in mountain and plain areas in this paper, the hierarchical evaluation of groundwater resources has been realized, and the impact of groundwater level variation on urban buildings is analyzed that based on the water distribution plan of the South-to-North water diversion project. These achievements can be used to optimize the water distribution plan and provide data support for reasonable conservation of groundwater.
Firstly, the Beijing hydro-geologic condition is generalized, the aquifer of the study area is divided vertically into five layers. The groundwater model is built by GMS and the study area is divided into 190 rows, 190 columns, 1 km * 1 km regular grids. Secondly, by using the monitoring data from 2013 to 2015, the model is identified and validated, the five aquifers are equilibrium analyzed, the groundwater recharge and excretion are calculated, the Beijing groundwater resources are evaluated that the recharge resources are 27.97 108m3/a, the exploitable resources are 24.8 108m3/a. In the end, by predicting, in 2025 the phreatic water level would not exceed the limited water level for groundwater recoverable that the restrictions are the floors of underground engineering and landfill, therefore, it would not harm the urban architecture and environment when the South-to-North water diversion project lasts ten years.