Mechanism of Yellow River diversion in controlling high arsenic groaundwater distribution since Late Pleistocene
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Abstract:
A series of hydrogeological survey and environment geology survey on Hetao basin has been carried out for many years. Two hundred and ninety eight groundwater samples from the shallow aquifer and three hundred and eighty-two hydrogeological borehole loggings were collected, and it was founded that 95% of samples had high arsenic groundwater(As>10g/L) in the Hetao basin and were distributed in the paleochannel zone and flood fans of Yellow River. The high arsenic groundwater distribution was discovered in the southern Hetao basin, and the four flood fans formed by bursting, diversion of ancient Y ellow River course since the Late Pleistocene has an corresponding relationship with spatial variability of high arsenic groundwater.The paleochannel zone and flood fans of Yellow River represent hy drogeochemical characteristics of the strong reducing environment, serious evaporation, and the low infiltration recharge of surface water. Due to the influence of pH value and reductive dissolution of iron oxides, the arsenic concentration in flood fans was lower than those in the paleochannel zone of the Yellow River. Results show that: the sedimentary environment controlled the hydrogeochemical processes of the shallow aquifer and played a decisive role in the distribution of high-arsenic groundwater.
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