| 北京潮白河冲洪积扇地下水水化学的分层分带特征 |
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| 关键词:Chaobai River hydrochemistry delamination zoning Quaternary groundwater |
| 基金项目:北京市财政专项项目“北京市平原区地下水污染调查”(编号: PXM2009-158305-074498);北京市委组织部优秀人才培养资助项目(编号: 2009D010002000002) |
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| Delamination and Zoning Characteristics of Quaternary Groundwater in Chaobai Alluvial-proluvial Fan, Beijing, Based on Hydrochemical Analysis |
| In order to study the characteristics of delamination and zoning of Quaternary groundwater in Chaobai alluvial fan based on the view of hydrochemistry，the authors collected a total of 293 samples for chemical analyses from shallow, middle and deep aquifer respectively in Chaobai alluvial-proluvial fan in the dry period of 2008 according to geological and hydrogeololgical conditions. Based on the data obtained, the authors calculated the means and mean square deviations of main chemical constituents such as NH4+, HCO3–, Cl–, F–, SO42–, NO3–, Fe, NO2–, hardness and TDS, and the results showed that the means of the other nine components except NO3- in shallow groundwater had the tendency of increase from the upper reaches to the middle and lower reaches. The mean square deviation was higher in the middle reaches than in the upper and the lower reaches. Almost all the Quaternary groundwater of Chaobai River pluvial fan belonged to alkaline water type. The groundwater chemical type changed gradually from HCO3-Ca·Mg type in the upper reaches to HCO3-Ca·Na·Mg and HCO3·SO4-Na·Ca·Mg type in the middle and lower reaches. The groundwater chemical type became more complicated and varied, and the concentration of Cl–, hardness and TDS increased with downstream runoff. Correlation analysis showed that TDS, hardness, Cl–, NO3– and EC (electric conductivity) had negative correlation with the groundwater sampling depth, whereas the pH value had positive correlation. The chemical analysis confirmed the alluvial fan hierarchical zonation. The upstream areas had relative homogeneous water quality, reflecting the single aquifer structure for its good hydrodynamic conditions. In the middle and the lower reaches, the distribution of constituent concentrations and their values showed shallow > middle > deep water samples. In addition, groundwater quality assessment results showed that the upstream area was better than the midstream area, and the midstream area was better than the downstream area. Almost all the higher concentrations and exceeded sample points were from shallow aquifer. This phenomenon reflects the stronger influence from human activity and the characteristics of multi-source input in mid-downstream area. |
| GUO Gao-xuan,HOU Quan-lin,XU Liang,LIU Jiu-rong,XIN Bao-dong.2014.Delamination and Zoning Characteristics of Quaternary Groundwater in Chaobai Alluvial-proluvial Fan, Beijing, Based on Hydrochemical Analysis[J].Acta Geoscientica Sinica,35(2):204-210. |
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