[河套灌区地下水化学时空特征及环境驱动因素]。

Q2 Environmental Science
Dan-Dan Du, Yan-Ying Bai, De-Liang Yuan
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引用次数: 0

摘要

为探讨内蒙古河套灌区地下水的化学特征和环境因子,选择乌兰布和、解放闸、永吉、宜昌、乌拉特等5个灌区为研究区。在冻融末期(3 月)、灌溉中期(7 月)和秋浇末期(11 月)三个典型时段,从 72 口地下水观测井中采集了 216 个地下水样品。综合运用统计分析、笛琶三线图、吉布斯图、离子比、主成分分析等方法,探讨地下水化学环境变化及地下水成分形成的环境驱动因素。利用水质指数(WQI)评价了地下水的饮用适宜性,利用 USSL 和 Wilcox 图分析了地下水的灌溉适宜性。结果表明,研究区域的地下水普遍偏咸,各期阴阳离子浓度由高到低依次为:冻融后期、秋灌后期和灌溉中期,其中 Na+ 和 Cl- 为主要贡献离子。地下水的化学类型主要是 Cl-Na,其次是 Cl-SO4-Ca-Mg,SO4-Ca-Mg、HCO3-Cl-Na、HCO3-Na 和 HCO3-Ca-Mg 并存。根据 WQI 值,河套灌区浅层地下水主要分为 IV 类和 V 类,总体水质较差。根据 USSL 图和 Wilcox 图,综合评价结果表明,灌区浅层地下水的盐度和钠浓度普遍较高。冻融后期 80.6%、灌溉中期 76.1%、秋灌后期 77.6%的水样缺乏灌溉适宜性。研究区地下水化学特征的主要控制因素有两个,即蒸发和岩石风化,Na+和Cl-主要来自盐岩的溶解和阳离子交换。农业灌溉和干旱是河套灌区地下水化学演变的主要驱动因素。该研究为优化农业管理措施提供了技术支持,为内蒙古黄河灌区地下水资源的合理利用提供了理论参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Chemical Spatiotemporal Characteristics and Environmental Driving Factors of Groundwater in Hetao Irrigation Area].

To explore the chemical characteristics and environmental factors of groundwater in the Hetao Irrigation Area of Inner Mongolia, five irrigation fields, including UulanBuh, Jiefangzha, Yongji, Yichang, and Wulat, were selected as the research area. From 72 groundwater observation wells, a total of 216 groundwater samples were collected throughout three typical periods: the end of freeze-thaw (March), the middle of irrigation (July), and the end of autumn watering (November). Comprehensive methods were utilized, such as statistical analysis, Piper three-line diagram, Gibbs diagram, ion ratio, and principal component analysis, to explore the changes in the groundwater chemical environment and the environmental driving factors of groundwater component formation. The groundwater drinking suitability was evaluated using the water quality index (WQI), and the irrigation suitability was analyzed using the USSL and Wilcox plots. The results indicated that the groundwater in the research areas was generally saline, and the total anion and cation concentrations in each period in ascending order were as follows: late freeze-thaw stage, late autumn irrigation stage, and mid-irrigation stage, with Na+ and Cl- being the major contributing ions. The chemical type of groundwater was dominated by Cl-Na, followed by Cl·SO4-Ca·Mg and a coexistence with SO4-Ca·Mg, HCO3·Cl-Na, HCO3-Na, and HCO3-Ca·Mg. Based on WQI values, the shallow groundwater in Hetao Irrigation District was mainly classified as Class IV and Class V, and the quality was poor in general. According to the USSL diagram and Wilcox diagram, the comprehensive evaluation results showed that the salinity and sodium concentration of shallow groundwater in the irrigation area were generally high. A total of 80.6% of the water samples during the late freeze-thaw period, 76.1% during the mid-irrigation period, and 77.6% during the late autumn irrigation period lacked irrigation suitability. Two major controlling factors of groundwater chemical characteristics were present in the study area, namely, evaporation and rock weathering, and Na+ and Cl- mainly came from the dissolution and cation exchange of salt rocks. Agricultural irrigation and drought were the chief driving factors of groundwater chemical evolution in the Hetao Irrigation Area. The study provides technical support for optimizing agricultural management measures and a theoretical reference for rational utilization of groundwater resources in the Yellow River irrigation area of Inner Mongolia.

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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
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