Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur, India.
Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur, India; School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India; Applied Policy Advisory to Hydrogeosciences Group, Indian Institute of Technology Kharagpur, Kharagpur, India.
Chemosphere. 2022 Jan;287(Pt 2):132144. doi: 10.1016/j.chemosphere.2021.132144. Epub 2021 Sep 3.
The groundwater within the aquifers of the Ganges River delta exhibits significant spatial variability in concentrations of redox-sensitive solutes [e.g., arsenic (As), iron (Fe), manganese (Mn)]. The groundwater As and Mn concentrations show conspicuous contrasting distribution on the opposite banks of the Bhagirathi-Hooghly (B-H) River, the Indian distributary of the Ganges River. Here, we investigate the differences in hydrostratigraphic framework and groundwater evolutionary pathways across the B-H River that might have resulted in such variations. We developed a hydrostratigraphic model for the region and also used inverse reaction-path modeling along three hypothesized end-member flow paths to understand the dominant processes that might control As and Mn cycling within the aquifers. Our results indicate that the variability of As and Mn across the B-H River is a function of a complex interplay between the aquifer architecture, groundwater chemistry, and redox conditions.
恒河三角洲含水层中的地下水在氧化还原敏感溶质（如砷 (As)、铁 (Fe)、锰 (Mn)）浓度方面表现出显著的空间变异性。恒河印度支流帕德玛河与胡格利河（B-H 河）两岸的地下水 As 和 Mn 浓度分布存在明显差异。在这里，我们研究了 B-H 河两岸的水文地层结构和地下水演化途径的差异，这些差异可能导致了这种变化。我们为该地区开发了一个水文地层模型，并沿三条假设的端元流动路径使用反反应路径建模，以了解控制含水层中 As 和 Mn 循环的主要过程。我们的结果表明，B-H 河两岸的 As 和 Mn 变化是含水层结构、地下水化学和氧化还原条件之间复杂相互作用的结果。
