Three decades of depth-dependent groundwater response to climate variability and human regime in the transboundary Indus-Ganges-Brahmaputra-Meghna mega river basin aquifers
Three decades of depth-dependent groundwater response to climate variability and human regime in the transboundary Indus-Ganges-Brahmaputra-Meghna mega river basin aquifers
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三十年来，印度河-恒河-雅鲁藏布江-梅格纳河流域跨界含水层中地下水对气候变化和人类状况的依赖深度的响应
DOI：
10.1016/j.advwatres.2021.103856
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发表时间：
2021
影响因子：
4.7
通讯作者：
Siddhartha Chattopadhyay
中科院分区：
文献类型：
--
作者：
P. Malakar;A. Mukherjee;S. Bhanja;A. Ganguly;R. K. Ray;A. Zahid;S. Sarkar;D. Saha;Siddhartha Chattopadhyay
地下水通过提供全球水和粮食安全，在人类适应气候变化和生态可持续性方面发挥着重要作用。据报道，在印度河-恒河-雅鲁藏布江-梅格纳含水层(IGBM)，地下水抽取是造成地下水储存量变化的主要因素之一。然而，对于气候和抽水对地下水的相对影响，目前还缺乏了解。据报道，以数据为导向的统计研究对于理解人-自然复杂系统至关重要。在此，我们使用滞后相关分析、小波相关分析和基于回归的优势分析，将局地降水、全球气候周期和人类影响对IGBM多深度地下水位的长期(1985-2015)影响(n=6753)归因于IGBM。我们的研究结果突出表明，根据盆地不同地区气候和人为驱动因素的不同性质，在多深度地下水位和降水之间观察到了不同的相位滞后模式。我们观察到了直观的反应，即浅层地下水的快速反应，以及随着深度的增加对全球气候模式的相对延迟的反应。然而，在开发程度最高的地区，控制地下水补给的水文过程被不可持续的地下水抽取所淹没，从而使水文-气候连续体脱钩。我们的结果还表明，在盆地的大部分地区，特别是在含水层更深的地方，地下水的抽取是主要的影响因素，从而突出了了解多深度地下水动态对未来地下水管理和政策干预的重要性。
Groundwater plays a major role in human adaptation and ecological sustainability against climate variability by providing global water and food security. In the Indus-Ganges-Brahmaputra-Meghna aquifers (IGBM), groundwater abstraction has been reported to be one of the primary contributors to groundwater storage variability. However, there is still a lack of understanding on the relative influence of climate and abstraction on groundwater. Data-guided statistical studies are reported to be crucial in understanding the human-natural complex system. Here, we attributed the long-term (1985–2015) impact of local-precipitation, global-climate cycles, and human influence on multi-depth groundwater levels (n=6753) in the IGBM using lag correlation analysis, wavelet coherence analysis, and regression-based dominance analysis. Our findings highlight the variable patterns of phase lags observed between multi-depth groundwater levels and precipitation depending on the different nature of climatic and anthropogenic drivers in different parts of the basin. We observed intuitive responses, i.e., rapid response in shallow groundwater and relatively delayed responses to the global climate patterns with increasing depth. However, in the most exploited areas, the hydrological processes governing the groundwater recharge are overwhelmed by unsustainable groundwater abstraction, thus decoupling the hydro-climatic continuum. Our results also suggest groundwater abstraction to be the dominant influence in most of the basin, particularly at the greater depth of the aquifer, thus highlighting the importance of understanding multi-depth groundwater dynamics for future groundwater management and policy interventions.
影响因子：
4.6
作者：
Krishnaswamy, Jagdish;Vaidyanathan, Srinivas;Badiger, Shrinivas
通讯作者：
Badiger, Shrinivas