Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 41402200 |
| 敦煌盆地地下水补给及其对气候变化的响应 | |
| 何建华 | |
| 主持机构 | 兰州大学 |
| 开始日期 | 2015 |
| 结束日期 | 2017 |
| 资助经费 | 250000(CNY) |
| 项目类别 | 青年科学基金项目 |
| 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 | Groundwater recharge is the most significant issue in the water resources exploitation, and recently years, its response to the climate change has been a focus in hydrogeology study. Dunhuang basin is a typical arid watershed in Northwest China, and increasing attention has been paid to Dunhuang recently because its famed Crescent Lake has been rapidly shrinking into the desert sand due to groundwater depletion. In addition, the environmental challenges have also become apparent from high rates of desertification and soil salinization. However, characteristics of groundwater beneath Dunhuang basin remain poorly understood, such as the timing of the groundwater recharge and its response to the past climate change.. The object of this study is to obtain the process of the groundwater recharge as well as its response to the climate change using the combination of the precipitation, groundwater, unsaturated zone and lake sediments. The input status of water resources under the modern climate system is examined by the stable isotope and 3H. which would provide clear sight of balance of the water resource in current atmospheric circulation. The chlorine mass balance(CMB) method is appiled to estimate groundwater recharge rate and its history in the vadose zone. The circulation and dynamics of groundwater is investigated using tritium and radiocarbon, with the result of construction of groundwater timing sequence in the aquifer, and then we plan to explore the groundwater recharge environment by combining hydrogen and oxygen isotopes as well as the dissloved inert gas. Lake sedments from the Qingyanchi are obtained to recover the process of regional climate change in forms of the sequence of the precipitation and temperature. Finally, we intend to compare the groundwater results with the palaeoenvironmental records form the lake sediment, unsaturated zone and historic documents to reveal the impact of climate change on the 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 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/2XILL650/346764 |
| 推荐引用方式 GB/T 7714 | 何建华.敦煌盆地地下水补给及其对气候变化的响应.2015. |
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