Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 41471023 |
| 吉兰泰盆地及周边沙漠地区地下水补给与古气候环境记录研究 | |
| 魏国孝 | |
| 主持机构 | 兰州大学 |
| 开始日期 | 2015 |
| 结束日期 | 2018 |
| 资助经费 | 900000(CNY) |
| 项目类别 | 面上项目 |
| 资助机构 | CN-NSFC（国家自然科学基金） |
| 语种 | 中文 |
| 国家 | 中国 |
| 英文简介 | The Jilantai Basin and Ulan Buh Desert have recently been the focus of attention due to increasing stress on its water resources and environmental degradation. The environmental challenges have also become apparent from high rates of desertification, falling water tables and soil salinization. At present, few data are available for the hydrogeology of the Jilantai Basin and Ulan Buh Desert, and much about the sources and characteristics of shallow groundwaters remain poorly understood owing to the area's isolation and relatively low water demand. The project considers a wide selection of geochemical indicators to aid understanding of the groundwater recharge and evolution. Specific targets are the recharge sources, timing of recharge and recharge history, especially since much of the water being exploited may have been recharged under different climatic conditions to the present day. The research investigates age of groundwater using tritium, CFCs, radiocarbon and clorine-36, and also multi-element approaches linked with simulation modeling to resolving some of the key questions in hydrogeology such as surface water and groundwater intraction and renewable periods of groundwater in this arid basin. We plan to use a novel medium - the moisture percolating through dune sands - containing in its chemistry, the record of wetter and drier years with a resolution of about 5-10 years. Sand samples are recovered by augur to approx. 50m. Moisture content, geological and physical properties are logged, then samples are eluted with high purity deionised water for Cl analysis and other inert tracers such as NO3. Radioisotopes- tritium and chlorine-36 will also be applied to investigation of modern recharge. Geochemical and isotope results are interpreted in relation to the regional hydrogeology and water quality to validate the results in terms of modern and palaeowaters. We plan to compare the groundwater results with the palaeoenvironmental records from lake sediment, ice core and historic documents to reveal the impact of climate change on groundwater system. The results are then discussed in terms of their application to the improved water resources management in the region by providing a deeper understanding on the slow accumulation of water resources and raising a greater appreciation of the value and the fragility of the resource. |
| 来源机构 | 兰州大学 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/345764 |
| 推荐引用方式 GB/T 7714 | 魏国孝.吉兰泰盆地及周边沙漠地区地下水补给与古气候环境记录研究.2015. |
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