Arid Zone Research ›› 2021, Vol. 38 ›› Issue (6): 1546-1555.doi: 10.13866/j.azr.2021.06.06

• Water Resources and Utilization • Previous Articles     Next Articles

Chemical characteristics and origin of groundwater in the Daihai basin

ZHANG Wenqi1,2(),DONG Shaogang1,2(),MA Mingyan1,ZHAO Zhen1,CHEN Yue1   

  1. 1. College of Ecology and Environment, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China
    2. Inner Mongolia Key Laboratory of River and Lake Ecology, Hohhot 010021, Inner Mongolia, China
  • Received:2021-03-26 Revised:2021-05-08 Online:2021-11-15 Published:2021-11-29
  • Contact: Shaogang DONG E-mail:793177079@qq.com;groundwater@163.com

Abstract:

The Daihai area is shrinking daily and water quality is deteriorating, which is adversely impacting regional ecological environment security. This study examined the characteristics and origin of groundwater in the Daihai basin using hydrogeological surveys, water sample collection, statistical analysis, Shukarev classification, ion proportion coefficients, and mineral saturation indices. The results show (1) Daihai lake is slightly salty alkaline. (2) Groundwater in the Daihai basin is weakly alkaline and the hydrochemical profile is mainly HCO3-Ca·Mg water. From the edge of the basin to Daihai, the hydrochemical profile transitions from HCO3-Ca to Cl-Na, which controls the action of hydrochemical component transition from leaching to evaporation and concentration. (3) The hydrochemistry of groundwater is mainly controlled by leaching, ion exchange, desulfurization acid, and human action, among which the dissolution and precipitation of carbonate minerals, silicate minerals, gypsum, and rock salt largely influence the chemical composition of groundwater. (4) Finally, NO3--N content was influenced by human activity, such as nitrogen fertilizers and human and animal manure discharge. Combined, these groundwater characteristics can significantly affect the vertical distribution of NO3--N concentrations.

Key words: groundwater, hydrochemical characteristics, water-rock interaction, Daihai basin