The Research On Groundwater Evolution Under Exploitation Conditions In The North China Plain

The North China Plain(NCP),an important economic core and agricultural base in the north part of China,takes groundwater as the major water supply.As economy booms,this area has been facing serious water shortage.Meanwhile,long-term excessive groundwater pumping there also results in some environmental-geology problems including continuous water level decline,land subsidence,etc.As the North China Plain quaternary groundwater system chosen the experimental objects,the research analyzed the evolution of the groundwater system under the influence of the climate and human exploitation in the past 60 years,including changes in water quantity and quality with associated environmental effects,revealing the evolution mechanism of the groundwater system,and proposed storage and conservation pattern of groundwater resources in typical areas.It is studied in this paper that the evolving characters of groundwater system,from the groundwater flow field,recharge,runoff,discharge regular pattern,comprehensive groundwater level data,elements of the water cycle,weather conditions and socio-economic indicators,and other factors.The results indicates that the average equilibrium difference between recharge and discharge and then caused the water level change is the main factors leading to hydrogeological parameters and hydrogeological environmental problems.In the typical study region,flow field of groundwater system flow to funnel center together,and funnel diffusion area was significantly associated with the groundwater level in central area;The change of groundwater level and the amount of mining are both related to GDP.Cosmically and high strength exploitation,which resulted in shallow groundwater table's descending and the system's acutely evolving,is the primary factor that bring on hydrogeologic parameters' change and hydro-geological environmental problems.Besides,sustainable groundwater exploitation modes were put forward to ensure safe water supply,give full play to the social and economic benefits of groundwater resources,and effectively regulate groundwater discharge and recharge.