James Watt School of Engineering, University Glasgow, UK; The National Water and Energy Center, United Arab Emirates University, Al Ain, United Arab Emirates.
School of Interdisciplinary Studies, University of Glasgow, Dumfries, UK.
Sci Total Environ. 2023 Apr 1;867:161489. doi: 10.1016/j.scitotenv.2023.161489. Epub 2023 Jan 10.
The intensive agricultural expansion and rapid urban development in Abu Dhabi Emirate, United Arab Emirates (UAE) have resulted in a major decline in local and regional groundwater levels. By using the latest release (RL06) of Gravity Recovery and Climate Experiment (GRACE) satellite measurements and Global Land Data Assimilation System (GLDAS) products, the groundwater storage change was computed and compared with the time series of in-situ monitoring wells over the period of 2010-2016. The RL06 GRACE products from Jet Propulsion Laboratory (JPL), University of Texas Center for Space Research (CSR), German Research Center for Geosciences (GFZ), and JPL mass concentrations (MASCON) were assessed and have shown satisfactory agreements with the monitoring wells. The JPL MASCON reflected the in-situ groundwater storage change better than the other GRACE products (R = 0.5, lag =1 month, RMSE = 13 mm). The groundwater recharge is estimated for the study area and compared with the in-situ recharge method that considers multi recharge components from the rainfall, irrigation return flow and internal fluxes. The results show that the agreements between in-situ and GRACE-derived recharge estimates are highly agreeable (e.g., R = 0.91, RMSE = 1.5 Mm to 7.8 Mm, and Nash-Sutcliff Efficiency = 0.7). Using the Mann-Kendall trend test and Sen's slope, the analyses of policies, number of wells, and farm areal expansion with groundwater time series derived from GRACE helped to validate GRACE and emphasize the importance of regulations for sustainable development of groundwater resources. The impacts of subsidy cuts after 2010 can be captured from the GRACE data in the eastern region of Abu Dhabi Emirate. The linear trend of groundwater storage anomaly obtained from GRACE over the period from 2003 to 2010 is -6.36 ± 0.6 mm/year while it showed a decline trend of -1.2 ± 0.6 mm/year after the subsidy cut. The proposed approach has a potential application for estimating groundwater recharge in other arid regions where in-situ monitoring wells are limited or absent.
阿布扎比酋长国（阿联酋）的集约化农业扩张和快速城市发展导致当地和地区地下水位大幅下降。利用最新发布的（RL06）重力恢复和气候实验（GRACE）卫星测量数据和全球陆地数据同化系统（GLDAS）产品，计算了地下水储量变化，并将其与 2010-2016 年期间的原位监测井时间序列进行了比较。评估了喷气推进实验室（JPL）、德克萨斯大学空间研究中心（CSR）、德国地球科学研究中心（GFZ）和 JPL 质量浓度（MASCON）的 RL06 GRACE 产品，结果表明它们与监测井具有令人满意的一致性。JPL MASCON 比其他 GRACE 产品更好地反映了原位地下水储量变化（R = 0.5，滞后 = 1 个月，RMSE = 13 毫米）。估计了研究区的地下水补给量，并与考虑了降雨、灌溉回流水和内部通量等多种补给成分的原位补给方法进行了比较。结果表明，原位和 GRACE 衍生补给估算之间的一致性非常高（例如，R = 0.91，RMSE = 1.5 毫米至 7.8 毫米，纳什-苏特克里夫效率 = 0.7）。使用曼肯德尔趋势检验和森斜率分析，从 GRACE 获得的政策、水井数量和农场面积扩展与地下水时间序列的关系，有助于验证 GRACE 的有效性，并强调了地下水资源可持续发展法规的重要性。阿布扎比酋长国东部地区从 GRACE 数据中可以捕捉到 2010 年后补贴削减的影响。从 GRACE 获得的 2003 年至 2010 年期间地下水储量异常的线性趋势为-6.36 ± 0.6 毫米/年，而补贴削减后则呈下降趋势，为-1.2 ± 0.6 毫米/年。该方法具有在其他原位监测井有限或不存在的干旱地区估算地下水补给量的潜在应用。
