Quantifying the contribution of ecological water replenishment on aquifer recovery using a refined groundwater model
Quantifying the contribution of ecological water replenishment on aquifer recovery using a refined groundwater model
复制标题
使用精细地下水模型量化生态补水对含水层恢复的贡献
DOI：
10.1016/j.scitotenv.2022.159216
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发表时间：
2022
影响因子：
9.8
通讯作者：
Xiaoyuan Cao
中科院分区：
文献类型：
--
作者：
Kangning Sun;Litang Hu;Jianchong Sun;Yuanzheng Zhai;Shouquan Zhang;Xiaoyuan Cao
生态补水因其独立控制、直接操作方便等优点，已成为恢复河流生态系统的重要措施。然而，在气候变化和人类活动的共同影响下，EWR活动对含水层系统的积极和消极贡献在不同的时间尺度上并没有得到充分的理解。建立了北方平原部分地区地下水流精细模型，模拟了地下水位日变化的动态过程。经过地下水位和径流资料的模型校正，模拟的地下水位和径流变化的Nash-Sutcliffe效率系数分别为0.98和0.60。结果清楚地表明，在三个集中的EWR含水层恢复径流的脉冲响应。采用有、无EWR方法，模拟的近河EWR对含水层恢复的最大贡献可达70%以上。采用情景分析方法，考虑不同降水量、地下水开采量减少和EWR活动，对含水层恢复总量进行了评价。对多情景下9年EWR活动的预测结果表明，地下水位上升幅度一般在4.08 ~ 8.57 m之间，EWR的贡献率为7.88%~ 36.59%。在18个非正规垃圾填埋场中，有14个填埋场存在潜在的地下水污染风险，表明了长期的EWR活动的负面影响。该研究为定量评价含水层含水率对含水层恢复的影响和贡献提供了一种方法，可为类似水文地质条件下含水层含水率评价提供参考。
Due to its independent control and directly easy operation, ecological water replenishment (EWR) has been an important measure for restoring river ecosystems. However, the positive and negative contribution of the EWR activities to aquifer system are not fully understood under the combined influences of climate change and human activities across time scales. A refined groundwater flow model integrating an open channel flow at daily time scales is developed in a part of Northern China Plain to reproduce the dynamic process of groundwater level changes. After model calibration with groundwater level and runoff data, the changes of simulated groundwater level and river runoff have the Nash-Sutcliffe efficiency coefficient of 0.98 and 0.60, respectively. Results clearly demonstrate that the impulse response of aquifer recovery to runoff in three centralized EWRs. By using with and without EWR method, the simulated maximum contribution of EWR near river to aquifer recovery may be over 70 %. Scenario analysis method considering different precipitation, groundwater exploitation reduction and EWR activities are applied to evaluate the total quantities of aquifer recovery. The prediction of nine-year EWR activities under multiple scenarios shows that the increased groundwater level generally varies from 4.08 to 8.57 m, and the contribution of EWR accounts for 7.88 %–36.59 %. It is also noticed that 14 out of the 18 informal landfill sites will face potential groundwater pollution risks, indicating the negative influences of long-term EWR activities. This study can provide a method for quantifying the influences and contribution of EWR on aquifer recovery and can be referred to as a guideline for EWR evaluation with similar hydrogeological conditions.