用稳定同位素-水化学方法评价印度德里西南部地下水化学和补给动态

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2025-10-03 DOI:10.1007/s11270-025-08425-w

Mamta Bisht, Manoj Shrivastava, Sudhir Kumar, Dhirendra Kumar Singh, Vinay Kumar Sehgal

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引用次数: 0

摘要

在印度德里西南部的近郊地区，地下水是淡水的重要来源。本研究利用稳定同位素（δ2H和δ1⁸O）在不同深度对地下水化学和补给动力学进行了双季节（季风前和季风后）分析，突出了地下水-排水（GR-DRW）相互作用。结果表明：地下水（季候前EC范围为262 ~ 9581 μS/cm，季候后EC范围为763 ~ 8600 μS/cm）和排水（季候前EC范围为2120 ~ 5326 μS/cm，季候后EC范围为1935 ~ 3600 μS/cm）的盐度在两个季节均超过允许范围。地下水和排水中阴离子的支配顺序为HCO3−>； Cl−> NO3−> SO42−，阳离子的支配顺序为Na+ >； Ca2+ > Mg2+ > K+。深层地下水稳定同位素数据显示，δ18O（-9.13‰）和δ2H（-54.17‰）耗竭最大，蒸发最小，停留时间较长。中深地下水δ18O和δ2H值枯竭较少（分别为-6.47‰和-45.09‰）。浅层地下水（δ18O: -6.17‰~ -3.23‰，δ2H: -42.75‰~ -31.02‰）和排水（δ18O: -6.91‰~ -2.21‰，δ2H: -48.02‰~ -35.52‰）在季风前蒸发作用下同位素值丰富。在季风前季节，降水或融雪的近期补给对同位素值有轻微影响，深层地下水δ18O: -7.85‰和δ2H: -47.13‰，浅层地下水δ18O: -5.66‰~ -1.82‰和δ2H: -48.57‰~ -39.91‰。此外，d-excess值分析表明，季风前深层地下水d-excess值最高（21.27‰），表明蒸发最小。浅层地下水（-0.70‰）和排水（-4.03‰）呈负d过量，表明蒸发富集。在季风后，d-excess值整体下降，排水（-16.08‰）表现出明显的蒸发效应。因此，这项研究对于管理德里西南部近郊地区的地下水资源至关重要，那里的淡水短缺问题日益受到关注。

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A Stable Isotope-hydrochemical Approach to Assess Groundwater Chemistry and Recharge Dynamics in Southwest Delhi, India

Groundwater is an essential supply of freshwater in the peri-urban area of Southwest Delhi, India. This study is novel in its dual-seasonal (pre-monsoon and post-monsoon) analysis of groundwater chemistry and recharge dynamics using stable isotope (δ²H and δ¹⁸O) at different depths which highlighting the groundwater-drain water (GR-DRW) interactions. The findings indicated that both groundwater (EC range: 262–9581 μS/cm in pre-monsoon, 763–8600 μS/cm in post-monsoon) and drain water (ECrange:2120- 5326 μS/cm in pre-monsoon,1935–3600 μS/cm in post-monsoon) had salinity beyond the permissible limit in both the seasons.The observed dominance of anions in groundwater and drain water was in the order of HCO₃⁻ > Cl⁻ > NO₃⁻ > SO₄²⁻, while the cations followed the order Na⁺ > Ca²⁺ > Mg²⁺ > K⁺. The stable isotopic data for the deep groundwater shows the most depleted δ¹⁸O (-9.13‰) and δ²H (-54.17‰) values, indicating minimal evaporation and longer residence times. Moderate depth groundwater has δ¹⁸O and δ²H value shows less depleted (-6.47‰ and -45.09‰). Shallow groundwater (δ¹⁸O: -6.17‰ to -3.23‰, δ²H: -42.75‰ to -31.02‰) and drain water (δ¹⁸O: -6.91‰ to -2.21‰, δ²H: -48.02‰ to -35.52‰) exhibit enriched isotopic values due to evaporation in the pre-monsoon season. In the pre-monsoon season, recent recharge from precipitation or snowmelt slightly influences isotopic values, with deep groundwater at δ¹⁸O: -7.85‰ and δ²H: -47.13‰, and shallow groundwater at δ¹⁸O: -5.66‰ to -1.82‰ and δ²H: -48.57‰ to -39.91‰. Furthermore, the analysis of d-excess values reveals that deep groundwater has the highest d-excess (21.27‰) during pre-monsoon, indicating minimal evaporation. Shallow groundwater (-0.70‰) and drain water (-4.03‰) show negative d-excess, suggesting evaporative enrichment. In post-monsoon, d-excess values decrease overall, with drain water (-16.08‰) showing significant evaporation effects. Therefore, this study is crucial for managing groundwater resources in peri-urban areas of Southwest Delhi, where the freshwater scarcity is a growing concern.

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.