HYDROCHEMISTRY AND GENESIS OF GROUNDWATER IN THE ALLUVIAL-PROLUVIAL FAN OF TAIZI RIVER
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摘要:
结合研究区已有的基础地质、水文地质资料, 基于水化学数据, 运用数理统计、舒卡列夫分类、Piper三线图、Schoeller图、Gibbs图、离子比值等方法, 分析冲洪积扇不同区域地下水水化学特征, 讨论不同区域地下水演化的主要控制因素, 研究地下水水环境污染状况. 结果表明: 太子河冲洪积扇地下水受人类活动影响较弱, 扇顶地下水水化学类型主要为HCO3·SO4-Ca型和HCO3·SO4·Cl-Ca型, 扇中地下水水化学类型主要为HCO3-Ca型和HCO3·SO4-Ca型, 扇缘地下水水化学类型主要为HCO3-Ca型. 太子河冲洪积扇不同部位地下水演化受到的岩石风化作用和离子交换作用影响的强度和方式不同. 太子河冲洪积扇地下水中"三氮"污染问题主要受采矿、冶金、化工等工矿活动和农业活动的影响, 空间分布特征与人类活动密切相关. 对太子河冲洪积扇地下水水化学类型和特征、水化学成因以及"三氮"污染现状的分析和研究, 可为下一步地下水源地开发利用和可持续发展提供科学依据.
Abstract:Based on the existing basic geological and hydrogeological data of the study area as well as hydrochemical data, the paper uses multiple methods including mathematical statistics, Schukalev classification, Piper diagram, Schoeller diagram, Gibbs diagram and ion ratio analysis to analyze the hydrochemical characteristics of groundwater in different areas of alluvial-proluvial fan, discusses the main controlling factors of groundwater evolution in different areas, and studies the status of groundwater environmental pollution. The results show that the groundwater in alluvial-proluvial fan of Taizi River is weakly affected by human activities, with the main hydrochemical types of HCO3·SO4-Ca and HCO3·SO4·Cl-Ca in the root fan, HCO3-Ca and HCO3·SO4-Ca types in the mid-fan and HCO3-Ca type in the end fan. The intensity and mode of rock weathering and ion exchange are various during groundwater evolution in different parts of Taizi River alluvial-proluvial fan. The nitrogen pollution in the groundwater is mainly affected by mining and metallurgical activities, chemical industry and agricultural activities, and its spatial distribution is closely related to human activities. The analysis and research on the hydrochemical types and characteristics, hydrochemical genesis of groundwater and the present situation of nitrogen pollution in Taizi River alluvial-proluvial fan can provide scientific basis for further exploitation and sustainable development of groundwater sources.
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Key words:
- alluvial-proluvial fan /
- Piper diagram /
- Gibbs diagram /
- groundwater evolution /
- nitrogen pollution /
- Taizi River
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表 1 主要离子质量浓度统计
Table 1. Mass concentration statistics of major ions
采样位置 样本数/个 项目 K+ Na+ Ca2+ Mg2+ SO42- HCO3- Cl- TDS 扇顶 20 均值 7.54 50.61 111.26 29.94 144.45 192.09 72.22 713.87 中值 3.28 41.53 111.05 27.12 109.53 179.10 66.97 690.88 标准差 11.63 33.76 53.43 17.99 108.23 84.90 50.91 304.27 最小值 0.49 8.18 30.79 7.24 32.59 72.77 13.31 294.89 最大值 49.42 122.20 249.00 77.11 429.60 417.79 228.80 1496.22 扇中 59 均值 2.91 27.83 89.10 18.62 82.62 199.90 43.49 431.04 中值 1.55 23.66 79.31 16.21 66.85 207.10 38.97 383.73 标准差 6.49 17.06 50.05 10.98 80.53 70.62 37.91 202.00 最小值 0.13 7.77 29.92 5.70 1.72 60.07 2.36 157.36 最大值 50.83 76.39 251.40 58.09 384.76 393.21 210.03 1186.40 扇缘 48 均值 1.40 28.80 88.33 16.70 50.56 238.32 48.43 401.43 中值 0.91 22.88 72.51 14.43 14.05 229.44 23.39 354.15 标准差 2.75 14.04 46.65 8.90 62.83 77.56 51.47 184.25 最小值 0.13 10.50 24.00 3.95 0.02 76.46 3.75 156.08 最大值 19.69 68.00 215.00 48.97 241.44 440.60 214.44 968.00 含量单位: mg/L. 
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