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Volume 40 Issue 3
Jun.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(3): 398-408
WANG Rui, LI Xiaohan. Hydrochemical characteristics and genesis of karst groundwater in the Baiquan spring catchment[J]. CARSOLOGICA SINICA, 2021, 40(3): 398-408.
Citation: WANG Rui, LI Xiaohan. Hydrochemical characteristics and genesis of karst groundwater in the Baiquan spring catchment[J]. CARSOLOGICA SINICA, 2021, 40(3): 398-408.
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Hydrochemical characteristics and genesis of karst groundwater in the Baiquan spring catchment

  • 1.

    School of Water Resources and Environment，Hebei GEO University/Hebei Province Key Laboratory of Sustained Utilization and Development of Water Resources/Hebei Center for Ecological and Environmental Geology Research，Hebei GEO University

  • 2.

    Institute of Hydrogeology and Environmental Geology，Chinese Academy of Geological Sciences

  • Publish Date: 2021-06-25
    Abstract
  • Karst groundwater in the Baiquan spring catchment is the main water supply source for industrial and agricultural production and urban and rural life in Xingtai City，Hebei Province. In recent years，influenced by changes of natural conditions and human activities，the groundwater flow field in this spring catchment has changed obviously，while the evolution mechanism of its hydrochemical field remains unclear. To solve this problem，on the basis of hydrogeological surveys and sample collection and testing，this work used statistical methods（descriptive statistics，Person correlation coefficient），saturation index calculation and hydrochemical methods（piper diagram，stiff diagram，Gibbs diagram，coefficients of ion proportion）to study the hydrochemical characteristics of karst groundwater in the spring catchment. The results show that the karst water in this area is weak-alkaline fresh water，in which Ca2+，Mg2+，HCO3- and SO42- are the main ions，mainly resulted from the weathering dissolution of calcite，dolomite and gypsum，and Na+ and Cl- are mainly from the dissolution of halite. Calcite changes from a dissolution state to an equilibrium state along the flow direction，while dolomite，gypsum and halite are always in a dissolution state. Karst groundwater in the recharge area and northern runoff area are basically the HCO3-Ca·Mg type. In addition to HCO3-Ca·Mg type，types of HCO3·SO4-Ca，HCO3·Cl-Ca·Mg and HCO3·SO4-Ca·Mg also occur in the karst groundwater near the Qili river，Sha river and coal-iron mine areas in the south. The increase of SO42- in the karst groundwater near the mine areas is attributed to the mixture of mine drainage with high SO42- content. Evaporation is only obvious in the discharge area with shallow water level and relatively slow groundwater flow. The Baiquan spring in the discharge area is HCO3·SO4·Cl-Ca·Mg type. In addition，industrial and agricultural activities have changed the runoff conditions and water quality of groundwater，resulting in rise of the content of NO3-，Cl-，Fe and total hardness in local karst groundwater or even exceeding the standards .

     

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