GRACE蓄水变化分解揭示的刚果河流域地下水变化的水文地质控制

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-10-01 DOI:10.1016/j.ejrh.2025.102810

Benjamin M. Kitambo , Sly Wongchuig , Raphael M. Tshimanga , Adrien Paris , Alejandro Blazquez , Daniel Moreira , Frederic Frappart , Ayan Santos Fleischmann , Jean-Marie O. Kileshye , Mohammad J. Tourian , Fabrice Papa

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引用次数: 0

摘要

研究区域刚果河流域（CRB）拥有大量地下水资源，作为CRB人口的主要饮用水来源发挥着至关重要的作用。本文通过对GRACE （Gravity Recovery and Climate Experiment，重力恢复与气候实验）任务测量的总蓄水异常（TWSA）进行分解，首次量化了2002 - 2015年CRB月地下水蓄水异常（GWSA）的时间动态和空间分布。基于观测的地表水储存异常（SWSA）在提供合理的地表水储存季节动态方面具有重要意义。每个水文水库的贡献，包括SWSA、根区土壤湿度和GWSA，分别代表TWSA季节振幅（~ 365 ± 105 km3）的~ 18 %、~ 59 %和~ 23 %，与以前基于模型的估计一致。此外，在次流域尺度上，我们的研究表明，GWSA的范围在TWSA的42 %（乌班吉和Kasaï）和16 %（下刚果）之间。GWSA的空间分布证实了各类型含水层的预期水文地质行为，与CRB中4个主要水文地质层相关，其中松散和固结含水层GWSA变异性大，基底流指数（BFI）高（BFI = 0.68），而裂缝流含水层GWSA变异性小，BFI = 0.14，基底含水层BFI = 0.12)低。

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Hydrogeological control of groundwater variations in the Congo River Basin revealed by GRACE water storage change decomposition

Study region

The Congo River Basin (CRB) holds significant groundwater (GW) resources that play a crucial role as the primary source of drinking water for CRB’s human population.

Study focus

Here, we provide the quantification of the temporal dynamics and, for the first time, the spatial distribution of monthly Groundwater Storage Anomaly (GWSA) in CRB from 2002 to 2015, through the decomposition of the Total Water Storage Anomaly (TWSA) measured by the Gravity Recovery and Climate Experiment (GRACE) mission. Observation based-surface water storage anomaly (SWSA) developed from multi-satellite missions was a game changer in providing reasonable GWSA seasonal dynamics.

New hydrological insights

The contributions of each hydrological reservoir, including SWSA, root-zone soil moisture, and GWSA, represent, respectively, ∼18 %, ∼59 %, and ∼23 % of the seasonal amplitude of TWSA (∼365 ± 105 km³), in line with previous model-based estimates. Additionally, at sub-basin scale, our study reveals that GWSA ranges between 42 % (for Ubangui and Kasaï) and 16 % (for Lower-Congo) of TWSA. The spatial distribution of GWSA confirms the expected hydrogeological behavior for each type of aquifer related to the four main hydrogeological formations encountered in CRB with high GWSA variability and high Base-Flow Index (BFI) in unconsolidated (BFI = 0.68) and consolidated (BFI = 0.67) sedimentary aquifers in contrast with lower GWSA variability and BFI in fracture flow (BFI = 0.14) and basement (BFI = 0.12) aquifers.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.