Groundwater characteristics at different periods in a typical monitoring area of the Hetao irrigation district of Inner Mongolia
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Abstract:
A typical monitoring area of the Hetao Irrigation District of Inner Mongolia was used in this study to explore the groundwater charactristics at different periods.The depth to water table,total dissolved solid (TDS) and eight major ions were continuously monitored from 05/2012 to 12/2015.The characteristics of depth to groundwater and TDS were analyzed with statistical methods,based on the filed observation data,for the entire monitoring period,non freezing thawing period and crop growth period,respectively.The results showed that:(1) 82% of the groundwater in the study area was brackish water.TDS was mostly between 1~2 g/L.The groundwater chemical type was HCO-3+Cl-Na++Mg2+.(2) There was a slightly positive correlation between depth to water table and TDS.However,the correlation coefficients between TDS and Cl,SO2-4,K++Na+ were relatively higher for all three periods,which implied that these ions had a great impact on TDS.(3) The correlation coefficients between Cl and TDS at three periods were crop growth period>non freezing thawing period>the entire monitoring period,indicating that concentration caused by evaporation and leaching played the dominant role in the variations of the groundwater chemical characteristics.
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