| 李兆,骆祖江,杨璐,胡颖.浅层地热能不同开发方案对深层地下淡水咸化效应研究[J].水利学报,2022,53(5):621-630 |
| 浅层地热能不同开发方案对深层地下淡水咸化效应研究 |
| Effect of different development schemes of shallow geothermal energy on salinization of deep fresh groundwater |
| 投稿时间：2021-12-21 |
| DOI：10.13243/j.cnki.slxb.20211119 |
| 中文关键词: 地下水源热泵 咸水入侵 多场耦合 数值模拟 |
| 英文关键词: groundwater heat pump system saltwater intrusion multi-field coupling numerical simulation |
| 基金项目:中央高校基本科研业务费专项项目(B220201039)；江苏省与南通市合作项目(南通市城市地质调查项目) |
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| 中文摘要: |
| 为了保证浅层地热能可持续开发,同时控制深层承压淡水咸化,需评价浅层地热能开发对深层地下水咸化控制效应。基于地下水渗流、热量运移和溶质运移理论,以江苏省地质工程勘察院(南通分院)地下水源热泵系统为研究对象,建立松散孔隙地下水系统渗流-热量运移-溶质运移多场耦合数值模型,模拟预测了第Ⅰ承压含水层浅层地热能开发过程中地下水系统水位、温度、水化学浓度的演化规律,通过增大利用温差和减小夏季灌采比优化浅层地热能开发利用方案,定量评价增大利用温差和减小夏季灌采比对热贯通和深层地下淡水咸化的控制效应。结果表明:增大利用温差和减小夏季灌采比能有效缓解热贯通和深层淡水咸化的发展趋势,增大利用温差对深层地下淡水咸化的控制效应更为显著,减小夏季灌采比对热贯通的控制效应更为显著。 |
| 英文摘要: |
| In order to ensure the sustainable development of shallow geothermal energy and control the salinization of fresh groundwater in deep aquifer, the effect of shallow geothermal energy development on control of groundwater salinization is evaluated. Based on the theory of groundwater seepage, heat transport and solute transport, the groundwater source heat pump system of Jiangsu Geological Engineering Survey Institute (Nantong Branch) is taken as the research object. A hydro-thermal-chemical multi-field coupled numerical model for the groundwater system is established. The numerical model predicts hydraulic head, temperature and chemistry concentration in the process of the shallow geothermal energy implementation. The plan of shallow geothermal energy implementation is optimized by adjusting the increased utilization temperature difference and decreasing circulation ratio in summer. The control effects of thermal transfixion and groundwater salinization are quantitatively evaluated. The results show that increasing the temperature difference and decreasing the circulation ratio in summer can effectively alleviate thermal transfixion and fresh groundwater salinization. The control effect of increasing the utilization temperature difference on the salinity of deep subsurface freshwater is more significant, and the control effect of decreasing the summer irrigation ratio on thermal penetration is more significant. |
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