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查卡里平原 (阿富汗) 地下水酸盐来源的识别和分配

Abdulhalim Zaryab^1,2, Asadullah Farahmand³, Thomas J Mack⁴

¹Engineering Geology and Hydrogeology, Faculty of Geology and Mines, Kabul Polytechnic University, Kabul, Afghanistan. a.zaryab@kpu.edu.af.

Environmental geochemistry and health

|July 18, 2023

概括

查卡里水层中的酸盐污染主要来自污水和肥,自然减弱最小. 了解这些来源对于可持续的地下水管理至关重要.

科学领域:

水文地质学水文地质学
环境地质化学环境地质化学
同位素水文学同位素水文学

背景情况:

查卡里流水层对当地供水至关重要,包括人类,动物和灌需求.
了解酸盐来源和命运对于管理查卡里平原地下水质量至关重要.

研究的目的:

研究查卡里平原地下水和河水的地质化学和稳定同位素比例.
确定和量化查卡里水层中酸盐污染的主要来源.
评估生物地化学过程对动态和酸盐减弱的影响.

主要方法:

在水样中分析主要离子和稳定同位素比 (δ2H-H2O, δ18O-H2O, δ15N-NO3−, δ18O-NO3−).
使用 δ15N-NO3− 与 δ18O-NO3− 的交叉图表来推断酸盐来源.
使用贝叶斯源识别模型 (BSIMM) 来量化不同酸盐来源的贡献.

主要成果:

肥料和污水被确定为主要的酸盐来源,约占75%.
土壤 (13%) 和化学肥料 (9.5%) 也被确定为贡献来源.
化是主要的生态化学过程,观察到可以忽略不计的化和酸盐的自然衰减.

结论:

查卡里平原的地下水污染受到污水和肥料的重大影响.
有效的地下水管理策略必须解决非点源,如农业排水和废水.
这些发现为决策者提供了关键数据,以实施有针对性的污染控制,并确保可持续的水资源管理.

关键词:

贝叶斯的稳定同位素混合模型.生物地化学过程生物地化学过程查卡里平原是一个平原.地下水的地下水.酸盐污染污染酸盐污染稳定的亚酸盐同位素.

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