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地热对干旱盆地的密集地下水利用构成威胁

Alexander S Honeyman¹, Caroline Blythe¹, Alandra Lopez^1,2

¹Department of Earth System Science, Doerr School of Sustainability, Stanford University, Stanford, California 94305, United States.

Environmental science & technology

|February 17, 2025

概括

圣路易斯山谷的地下水污染主要是由与地热液体混合引起的,因过度抽而加剧. 这项研究确定地热流体流入是饮用水井中含量升高的主要来源.

科学领域:

环境科学环境科学
水文地质学水文地质学
地质化学地质化学

背景情况:

地下水质量对于人类消费和农业至关重要.
地质性毒素,如 (As),对水源构成重大威胁.
科罗拉多州的圣路易斯山谷 (SLV) 面临的挑战是的度超过了美国环境保护局 (EPA) 的最大污染物水平 (MCL).

研究的目的:

调查圣路易斯谷地下水中高度的来源和地球化学过程.
区分地质释放机制,包括粘土脱水,脱/溶解和地热流体入侵.

主要方法:

社区参与收集了244个地下水样本.
测量主要元素和微量元素度.
对长期土地沉降和深度解析沉积物质的分析.
统计,机器学习和水热力学模型的应用.

主要成果:

地质化学和统计分析始终表明,与地热流体混合是溶解的主要来源.
过度抽似乎促进了高的地热流体向上迁移到较浅的含水层区域.
其他潜在的机制,如含的粘土的脱水或pH促进的脱水,被发现不那么重要.

结论:

地热流体的混合是圣路易斯谷地下水中污染的主要驱动因素.
过度抽水层加剧了暴露,因为它将更深的,富含的地热流体吸引到抽水井.
了解这些过程对于管理饮用和灌用水供应中的风险至关重要.

关键词:

亚是一种.数据科学数据科学地热是地球上的热能.地下水地下水地下水机器学习是机器学习.过度抽是一种过度抽.统计学学习的学习.

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