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| DOI：10.13522/j.cnki.ggps.2023199 |
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| Numerical simulation research on the impact of surface water replacement on groundwater level in the overexploited area of Songgu |
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NIU Qi, REN Chunping, WU Jianhua, GAO Hongwei
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College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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| Abstract: |
| 【Objective】Explore the impact of surface water replacement on groundwater level in the Songgu overexploited area of Jiexiu city after the implementation of the Dongshan water supply project. 【Method】 Using the SWAT-MODFLOW coupling model, the surface hydrological processes and groundwater dynamics in the Songgu overexploited area were established, and groundwater level simulation predictions were made for different guaranteed rates of the Dongshan water supply project's pressure mining plan.【Result】After implementing the pressure mining measures, the groundwater level in the Songgu overexploited area rebounded significantly and the overall underground water balance shifted from negative to positive equilibrium. Under the minimum water supply guarantee rate, the groundwater level in the study area also showed a significant rebound, with a groundwater level rebound rate of about 0.73 m/a at the center of the funnel, which gradually moved from Songgu to Jiexiu urban area. The area of groundwater level recovery under 90% water supply guarantee rate for groundwater level below 670, 680, and 690 m increased by 1.78 times, 1.8 times, and 2 times, respectively, compared to that under 50% water supply guarantee rate. 【Conclusion】The replacement of surface water with groundwater has a significant effect on the rebound of groundwater level in the Songgu overexploited area. In situations where water resources are abundant, surface water replacement can appropriately promote groundwater recovery. |
| Key words: Songgu; surface water replaces groundwater; water supply guarantee rate; SWAT-MODFLOW; Dongshan water supply |
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