P. Castellazzi, T. Ransley, A. McPherson, E. Slatter, A. Frost, A. Shokri, L. Wallace, R. Crosbie, S. Janardhanan, P. Kilgour, M. Raiber, J. Vizy, N. Rollet
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引用次数: 0
摘要
在许多地区,大型承压含水层系统在维持人类住区和工业方面发挥着至关重要的作用。要了解这些水资源的可持续性,就必须评估地下水储量的变化。由于地下水位和含水层储量数据的分布和可用性,对地下水储量的直接现场观测受到限制。在此,我们使用并比较了两种辅助方法,分别应用于流域和次流域尺度,以评估世界上最大的承压含水层系统之一--大阿特西亚盆地(GAB)的地下水储量变化。第一种方法是地下水预算法,将地下水储量变化作为流入和流出大自流盆地的通量的剩余值,假定所有通量都已计算在内并进行了准确估算。第二种方法使用 GRACE 卫星提供的时变重力数据来估算地下水质量的时间变化,前提是正确减去 GRACE 卫星探测到的陆地水质量变化的所有其他成分。尽管在 20 世纪观测到地下水枯竭,但 2002-2022 年间地下水储量基本保持稳定。在主要补给区苏拉特分流域检测到储量增加。储量增加的原因是研究期间大补给事件过多和/或恢复自由流动水井后储量恢复。分解 GRACE 数据的方法假定承压含水层的蓄水量变化主要受 GAB 变化的影响,因此可能会高估 GAB 的增加量,错误地将上覆含水层的增加量归因于 GAB。与此相反,地下水预算中使用的补给估算没有考虑洪水补给,可能会低估地下蓄水层的储量增加。
Assessing Groundwater Storage Change in the Great Artesian Basin Using GRACE and Groundwater Budgets
Large, confined aquifer systems play a vital role in sustaining human settlements and industries in many regions. Understanding the sustainability of these water resources requires the evaluation of groundwater storage change. Direct in-situ observation of groundwater storage is limited by the distribution and availability of groundwater level and aquifer storativity data. Here, we use and compare two auxiliary methods, applied at basin and sub-basin scales, to assess groundwater storage changes in the Great Artesian Basin (GAB), one of the World's largest confined aquifer systems. The first, the groundwater budget, derives storage change as the residual of fluxes in and out of the GAB, assuming they are all accounted for and accurately estimated. The second uses time-variable gravity data from GRACE satellites to estimate temporal changes in groundwater mass, assuming that all other components of the terrestrial water mass change detected by GRACE are correctly subtracted. Despite the depletion observed during the 20th century, groundwater storage is mostly stable during 2002–2022. An increase in storage is detected in the Surat sub-basin, a major recharge area. This increase is attributed to an over-representation of large recharge events during the study period and/or storage recovery following rehabilitation of free-flowing bores. The approach consisting in disaggregating GRACE data assumes that water storage changes in confined aquifers is dominated by changes in the GAB, and as such, it may overestimate the increase in the GAB by incorrectly attributing the increase occurring in overlying aquifers to the GAB. In contrast, the recharge estimates used in the groundwater budgets do not account for flood recharge and might underestimate storage increase in the GAB.
期刊介绍:
Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.