Spatial variability of the shallow groundwater level and its chemistry characteristics in the low plain around the Bohai Sea,North China |
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Authors: | Zaiming Zhou Guanghui Zhang Mingjiang Yan Jinzhe Wang |
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Institution: | (1) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Zhengding, Hebei, 050803, China; |
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Abstract: | To characterize the spatial distribution of groundwater level (GWL) and its chemistry characteristics in the low plain around
the Bohai Sea, shallow groundwater depth of 130 wells were determined. Water soluble ions composition, total dissolved solid
(TDS), electric conductivity (EC), total hardness (TH), total alkalinity (TA), and total salt content (TS) of 128 representative
groundwater samples were also measured. Classical statistics, geostatistical method combined with GIS technique were then
used to analyze the spatial variability and distribution of GWL and groundwater chemical properties. Results show that GWL,
TDS, EC, TH, TA, and TS all presented a lognormal distribution and could be fitted by different semivariogram models (spherical,
exponential, and Gaussian). Spatial structure of GWL, TDS, EC, TH, TA, and TS changed obviously. GWL decreased from west inland
plain to the east coastal plain, however, TDS, EC, and TS increased from west to east, TH and TA were higher in the middle
and coastal plain area. Groundwater chemical type in the coastal plain was SO42−·Cl−—Na+ while chemical types in the inland plain were SO42−·Cl−—Ca2+·Mg2+ and HCO3−—Ca2+·Mg2+. |
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