LIU Jun, CHEN Zongyu, WANG Ying, WEI Wen, CHEN Jiang

(Institute of Hydrogeology and Environmental Geology，Chinese Academy of Geological Sciences，Shijiazhuang 050061，China)

Abstract: Hydrochemical characteristics and its influencing factors of regional groundwater systems under the conditions of large-scale exploitation were discussed based on the data of groundwater resource investigation in Northern China. Results show that the water type of groundwater in shallow aquifers changed into bicarbonate type with increasing TDS, which was more significant in the Shanxi Basin, the Northern China Plain and the Northeastern China Plain than arid region of Northwestern China with earlier large scale development and utilization of groundwater. The water type of groundwater in deep aquifers changed from bicarbonate type with increasing TDS and pollutant, which was obvious in the Junggar Basin, the Shanxi Basin, the Northern China Plain and the Northeastern China Plain. Moreover, the major constituent, TDS and pollutants in groundwater all showed increasing trend in over-exploration area such as irrigated regions, saline groundwater regions and major urban areas. Changes of groundwater flow due to the over-exploration since 1970, increasing and unreasonable pollutant emissions by regional human activities were thought to be the main causes.

Keywords：Groundwater；Hydrochemistry；Arid and semi-arid areas; Groundwater pollution

EARTH AND ENVIRONMENT Vol.45, No.4, Tot No.318, 2017, Page 408-414