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Recharge, timescale of groundwater flow, and geochemical evolution of the groundwater system in the Najd area, Dhofer Governorate, Sultanate of Oman

阿曼苏丹国佐费尔省内志地区地下水系统的补给、时间尺度和地球化学演化

基本信息

批准号：
165684537
负责人：
Professor Dr. Werner Aeschbach
金额：
--
依托单位：
Department Hydrogeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/165684537?language=en
关键词：
Recharge timescale groundwater flow geochemical

项目摘要

The research hypothesis examined in this project says that groundwater of the arid Najd area in southwestern Oman originated from infiltration of monsoon precipitation in the Dhofar mountain range with minor contributions from indirect recharge via Wadis. Due to past climate change most of the groundwater may have been recharged at higher rates several thousand years ago compared to current recharge making most of the groundwater a fossile and hence non-renewable resource. The geochemical evolution of the groundwater is not only controlled by water-rock interaction during flow of groundwater following the incline of the aquifer formations towards the north but also by mixing between the different aquifers. The main goal of the proposed study is to assess the key aspects of the water balance that will lead to a comprehensive and reliable knowledge about recharge, flow, and transport processes in the Najd aquifers. The methodological approach proposed is a state-of-the-art combination of hydrochemical and isotope investigations with basic hydrological and hydrogeological field work. Hydrochemistry (major and trace elements) and environmental isotopes (18O, 2H, 3H/3He, SF6, 14C, 13C, noble gases) will be used to get reliable data on groundwater origin, age, and flowpaths. Together with hydrogeological data these parameters will be used to develop a comprehensive conceptual hydrogeological flow model of the Najd aquifers.

该项目中的研究假设表明，阿曼西南部干旱的Najd地区的地下水来自佐法尔山脉季风降水的渗透，通过Wadis间接补给的贡献较小。由于过去的气候变化，与目前的补给相比，几千年前大部分地下水的补给率可能更高，使大部分地下水成为化石资源，因此是不可再生资源。地下水的地球化学演化不仅受地下水沿含水层向北倾斜流动过程中的水岩作用控制，而且受不同含水层之间的混合控制。拟议研究的主要目标是评估水平衡的关键方面，这将导致对Najd含水层的补给，流量和运输过程的全面和可靠的知识。所提出的方法是将水化学和同位素调查与基本的水文和水文地质实地工作相结合的最先进的方法。水化学（主要和微量元素）和环境同位素（18 O，2 H，3 H/3 He，SF6，14 C，13 C，惰性气体）将用于获得关于地下水起源，年龄和流动路径的可靠数据。这些参数将与水文地质数据一起用于建立Najd含水层的综合概念性水文地质流动模型。