Groundwater for Sustainable Development最新文献

{"title":"New ideas for enhancing the microbial reaction zone: Enhancing colloidal properties for the removal of benzene and naphthalene from groundwater","authors":"Jianli Jia,&nbsp;Weiran Wang,&nbsp;Aoran Li,&nbsp;Ben Zhang,&nbsp;Bing Xiao,&nbsp;Yichi Ma,&nbsp;Haojun Yang,&nbsp;Shuyue Zhang,&nbsp;Yequan Wang","doi":"10.1016/j.gsd.2025.101491","DOIUrl":"10.1016/j.gsd.2025.101491","url":null,"abstract":"<div><div>The uncontrolled release of aromatic hydrocarbons such as benzene and naphthalene from coal chemical sites poses significant threats to groundwater quality. In situ microbial reaction zone (IMRZ) technology offers a promising solution, but its effectiveness is often limited by poor microbial dispersion and colloid instability. This study presents a novel approach to enhancing IMRZ formation and performance by incorporating colloidal silica into the microbial inoculum of <em>Achromobacter xylosoxidans</em> BP1. Quartz sand column and flume experiments were conducted to assess microbial migration, aggregation, and biodegradation efficiency. Results showed that colloidal silica significantly improved microbial stability and diffusion, enabling the formation of clearly defined microbial reaction zones. The colloid-enhanced system achieved benzene and naphthalene degradation efficiencies of up to 57.47 % and 76.11 % in columns, and over 90 % in scaled-up flume systems. Whole-genome analysis and GC-MS metabolite profiling revealed that both primary degradation and co-metabolic pathways contributed to pollutant removal. This study demonstrates a scalable, efficient method to overcome key limitations in IMRZ technology, advancing the field of in situ bioremediation.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101491"},"PeriodicalIF":4.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the contribution of managed aquifer recharge programs on groundwater storage in the Ramganga basin","authors":"Mohammad Faiz Alam ,&nbsp;Paul Pavelic ,&nbsp;Navneet Sharma ,&nbsp;Alok Sikka","doi":"10.1016/j.gsd.2025.101486","DOIUrl":"10.1016/j.gsd.2025.101486","url":null,"abstract":"<div><div>Groundwater, which supports nearly two-thirds of irrigation and underpins food security in India, faces depletion due to unsustainable abstraction. Managed aquifer recharge (MAR) programs, which replenish aquifers during periods of surplus surface water, have emerged as a national strategy to bolster groundwater security. This study evaluates the contribution of government-led aquifer recharge programs to groundwater storage in the alluvial aquifers of the Ramganga basin, whilst taking account of factors such as climate variability and agricultural water demand. The analysis, drawing on district-level MAR development data, field monitoring of recharge structures, and trends in rainfall, irrigation, and groundwater levels, reveals that MAR initiatives have a positive impact on groundwater storage. However, at their current scale, their contribution is modest accounting for an estimated 2.5–7.5 % of rainfall-recharge in 2023. Thus, groundwater levels continue to decline across districts, with average annual depletion rates of 0.21–0.29 m/year, indicating that current MAR contributions remain insufficient to counter the supply-demand imbalance. Scaling of MAR has been assessed to require &gt;40,000 additional recharge ponds. Moreover, the recharge efficiency of existing structures, averaging 48 mm/day, falls well below that of optimized MAR systems that incorporate recharge wells. Beyond supply-side measures, this study highlights the need for integrated demand management strategies in the Ganges basin. It underscores the pressing need for a comprehensive, science-based approach to MAR implementation, coupled with demand-side interventions, to ensure sustainable groundwater management.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101486"},"PeriodicalIF":4.9,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in the treatment of arsenic-contaminated groundwater by the adsorption onto iron-coated cork granulates on fixed-bed column","authors":"Mariko A. Carneiro ,&nbsp;Ariana M.A. Pintor ,&nbsp;Luewton L.F. Agostinho ,&nbsp;Rui A.R. Boaventura ,&nbsp;Cidália M.S. Botelho","doi":"10.1016/j.gsd.2025.101488","DOIUrl":"10.1016/j.gsd.2025.101488","url":null,"abstract":"<div><div>Iron-coated cork granulates (ICG) are an emerging adsorbent successfully tested in continuous mode to remove arsenic and other oxyanions from water. Novel adsorbents are reported in the literature to show good arsenic adsorption capacities in aqueous solution; however, many fail to reach WHO limits for drinking water when treating natural water with a complex matrix. The present study investigates the performance of ICG on arsenic adsorption using different groundwater (GW) matrices, from wells in Portugal (pH 6.95 ± 0.01, NO₃⁻ = 30 mg L⁻¹, Cl⁻ = 20.4 mg L⁻¹, PO₄³⁻ = 0.12 mg L⁻¹) and The Netherlands (pH = 7.4 ± 0.1, NO₃⁻ &lt; 0.27 mg L⁻¹, Cl⁻ = 1097 mg L⁻¹, PO₄³⁻ = 0.502 mg L⁻¹). Groundwater (As-spiked or not) was treated in lab-scale fixed-bed columns from initial concentrations (11–300 μg L⁻¹) to levels below the arsenic WHO guideline and European Union Directive 2020/2184 of 10 μg L⁻¹. The effect of an oxidation-filtration pretreatment was also investigated.</div><div>The ICG presented good performance when using real groundwater as feed across a wide range of arsenic concentrations. In all cases, the WHO guidelines and the European Commission's limit for arsenic in drinking water could be reached. The ICG performed better in the GW matrix from The Netherlands than that from Portugal. That could be attributed to the elevated concentrations of nitrate in the Portuguese matrix, which might be more competitive with the arsenic oxyanions for the ferric sites in the adsorbent, compared to the more abundant chloride in the Dutch matrix. Moreover, the pretreatment using the aeration/sand filter reactor improved the arsenic removal in the Dutch matrix. It reached values of breakthrough time, treated volume at breakthrough and bed volumes at breakthrough of 39 ± 1 h, 11.7 ± 0.4 L, 202 ± 6, respectively, for an initial concentration of 0.30 ± 0.04 mg L⁻¹. This study showed that the use of low-cost, environmentally friendly iron-coated cork granulates to remove arsenic from groundwater is feasible at different concentrations in different water matrices.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101488"},"PeriodicalIF":4.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical processes in different sources of the hydrocarbon contaminated karst groundwater with emphasizing on iodine species, south west Iran","authors":"Narges Bayat ,&nbsp;Farshad Alijani ,&nbsp;Hamid Reza Nassery ,&nbsp;Hiroyuki Matsuzaki ,&nbsp;Erfan Sadeghi","doi":"10.1016/j.gsd.2025.101489","DOIUrl":"10.1016/j.gsd.2025.101489","url":null,"abstract":"<div><div>Karst aquifers, the significant drinking water sources, are prone to contamination from natural and anthropogenic pollutants due to their unique hydrogeological conditions. This study determines the impact of hydrocarbon contamination on the source of iodine, fluoride, and TOC in groundwater in the Southwest provinces of Iran. A total of 30 water samples—including shallow karst groundwater (n = 13) and deep oilfield brine (n = 3)—were collected during two seasons (August 2021 and February 2022). In this regard, the concentrations of iodine isotopes (¹²⁹I and ¹²⁷I, ¹²⁹I/¹²⁷I ratio), halogens (I, F, Br, Cl), TOC, and BTEX compounds (benzene, toluene, ethylbenzene, xylene) were analyzed to trace contamination sources and processes. The major chemical composition of the samples consist of CaSO₄, CaHCO₃, and NaCl types. The concentrations of iodine and fluoride in groundwater ranged from 1.93 to 435 mg/L and 0.11–1.5 mg/L, respectively, with the highest values observed in samples affected by bitumen seepage (S6) and oil contamination (P2). The ¹²⁹I/¹²⁷I vs. 1/¹²⁷I, ¹²⁹I vs. Cl, and ¹²⁷I vs. Cl graphs show a clear distinction between different karst groundwater samples and related pollution revealed distinct contamination patterns among groundwater sources, highlighting mixing between different recharge sources and the pronounced contamination of modern iodine compared to modern rain. Our findings offer new perspectives on the proportions of iodine isotopes ratio (¹²⁹I/¹²⁷I) and the concentrations of I and F. These insights highlight that water mixing, dilution, and hydrocarbon pollution are the primary elements influencing karst aquifers in the researched region.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101489"},"PeriodicalIF":4.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial transformation of upper aquifers loamy rocks under complex pollution during in situ bioremediation","authors":"Grigory Artemiev ,&nbsp;Nadezhda Popova ,&nbsp;Kirill Boldyrev ,&nbsp;Ilia Volkov ,&nbsp;Nataliya Chistyakova ,&nbsp;Natalia Boeva ,&nbsp;Alexey Safonov","doi":"10.1016/j.gsd.2025.101487","DOIUrl":"10.1016/j.gsd.2025.101487","url":null,"abstract":"<div><div>The study investigated biogenic modifications in loamy rocks following a single stimulation of microbial activity in groundwater through the application of milk whey at a depth of 10–14 m in proximity to a radioactive waste storage facility, within a nitrate-polluted area near the Siberian Chemical Combine (Seversk, Tomsk Region). The consumption of nitrate ions and the establishment of anaerobic conditions via microbial denitrification were completed within 45 days of the in situ experiment. Milk whey served as an effective source of organic carbon (C), calcium (Ca), and phosphorus (P) for in situ bioremediation processes. Observed phenomena included the accumulation of carbonate minerals, reduction of iron and sulfate ions, and the formation of sulfide-iron phases. The release of iron from aluminosilicate mineral phases under anaerobic conditions resulted in partial mineral dissolution and the formation of amorphous silica. Subsequent phase analysis revealed the presence of crystalline iron sulfide forms, exhibiting compositional similarities to pyrrhotite and troilite. Laboratory experiments demonstrated that the absence of sulfate in the system led to a significant decrease in iron content within the solid phase, accompanied by a redistribution of remaining iron from silicate mineral matrices to amorphous phases associated with organic matter. Conversely, the presence of sulfate facilitated activity of sulfate-reducing bacteria and the accumulation of iron sulfide phases. The biogenic formation of authigenic mineral phases constitutes a critical factor in the development of a sedimentary mineral barrier, which is essential during complex groundwater contamination involving radionuclides and heavy metals.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101487"},"PeriodicalIF":4.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geoelectric layer susceptibility and vulnerability index mapping of Ifedore Local Government Area, Ondo State, Nigeria","authors":"P.O. Falae ,&nbsp;A.K. Ogundana","doi":"10.1016/j.gsd.2025.101490","DOIUrl":"10.1016/j.gsd.2025.101490","url":null,"abstract":"<div><div>Groundwater contamination remains a critical threat to water security, especially in areas where aquifers serve as the main source of potable water. In Ifedore Local Government Area, Ondo State, Nigeria, groundwater vulnerability has not been fully assessed, posing a risk to water resources. This study evaluates the region's vulnerability using two complementary models: the Groundwater Occurrence, Overlying Lithology, and Depth to Aquifer (GOD) model and the Geoelectric Layer Susceptibility Index (GLSI). The aim is to assess the protective capacity of aquifers and identify areas prone to contamination. Vertical Electrical Sounding (VES) data were utilized to derive geoelectrical parameters for the GLSI, while basic hydrogeological data supported the GOD model. Results from the GOD model indicate 60 % low, 3 % medium, and 37 % negligible vulnerability. The GLSI model, which integrates resistivity and vadose zone thickness, reveals 20 % low, 73 % medium, and 7 % high vulnerability. Both models indicate that vulnerability ranges from low to moderate, with some areas more susceptible to surface contaminants. Sensitivity analysis was conducted by introducing ±10 % variations to the parameters of both models. The findings show moderate sensitivity, with vulnerability classifications shifting in several VES locations, particularly in the GLSI model. This highlights the need for precise data acquisition—especially for parameters like resistivity and layer thickness—to ensure accurate assessments. Additionally, land use and land cover (LULC) analysis was integrated to evaluate anthropogenic influence on aquifer vulnerability. Areas with agricultural and urban land uses showed elevated risks, underlining the importance of managing land activities near aquifer recharge zones. The study concludes that combining GOD, GLSI, and LULC data enhances groundwater vulnerability assessments and supports the development of effective water protection and land-use strategies in data-scarce, crystalline terrains.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101490"},"PeriodicalIF":4.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of aquifer vulnerability and water quality: Validated using groundwater flow origin-based regression analysis","authors":"Ana Beatriz Rubio-Arellano ,&nbsp;José Alfredo Ramos-Leal ,&nbsp;Oscar Guadalupe Almanza-Tovar ,&nbsp;Víctor Manuel Vázquez-Báez ,&nbsp;Janete Morán-Ramírez","doi":"10.1016/j.gsd.2025.101478","DOIUrl":"10.1016/j.gsd.2025.101478","url":null,"abstract":"<div><div>The Puebla Valley aquifer (PV), a volcanosedimentary system located in central Mexico, faces increasing pressure due to land use change and groundwater contamination. However, its vulnerability had not been comprehensively assessed. This study aimed to evaluate the intrinsic vulnerability of the PV aquifer using the DRASTIC methodology adapted to the characteristics of a volcanosedimentary environment and validate the results using simple linear regression analysis based on the origin of groundwater flows, correlating them with water quality indices (WQI) and contamination indices (C<span><math><msub><mrow></mrow><mrow><mi>d</mi></mrow></msub></math></span>).</div><div>The DRASTIC model was adjusted by modifying parameter weights to reflect local aquifer conditions, considering land use change (recharge, agricultural and urban zones) as the basis. Linear regression showed significant correlations (p<span><math><mo>&lt;</mo></math></span>0.001) between vulnerability and WQI; for flows from Sierra Nevada, an 84% fit was found between these two variables, and 83% for La Malinche. The Atoyac River was identified as the main contamination source, with extreme values of WQI=35 (poor quality) and C<span><math><mrow><msub><mrow></mrow><mrow><mi>d</mi></mrow></msub><mo>&gt;</mo><mn>3</mn></mrow></math></span> (high health risk) in adjacent areas.</div><div>DRASTIC classified 550 km<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> (25% of the area) as low vulnerability, 800 km<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> (36%) as moderate, and 690 km<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> (31%) as high. The most influential factors were recharge (<span><math><mrow><mo>&gt;</mo><mn>350</mn></mrow></math></span> mm/year in critical zones), water table depth (<span><math><mo>&lt;</mo></math></span>7 m) and topographic gradient (<span><math><mo>&gt;</mo></math></span>5%).</div><div>These results validate for the first time a DRASTIC adapted with flow-origin-based regression for volcanosedimentary aquifers. They emphasize the need to: urgently protect recharge zones and regulate discharges into the Atoyac River. The methodology provides tools for sustainable management in subhumid environments, but under anthropogenic activities.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101478"},"PeriodicalIF":4.9,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing groundwater quality in a saline coastal aquifer through managed aquifer recharge: A comprehensive study by long-term groundwater level and hydrochemical monitoring","authors":"Valavath Kuttan Haritha ,&nbsp;Mani Christy Raicy ,&nbsp;Lakshmanan Elango","doi":"10.1016/j.gsd.2025.101480","DOIUrl":"10.1016/j.gsd.2025.101480","url":null,"abstract":"<div><div>Safe drinking water has become scarce in many parts of the world, especially along the coast. Despite adequate rainfall in many coastal regions, over-exploitation has led to the threat of seawater intrusion. Induced recharge enhances groundwater storage and can mitigate seawater intrusion, especially in coastal areas with over-exploited freshwater resources. This study investigates the hydrogeochemical processes due to induced recharge by managed aquifer recharge (MAR) structure and its impact on improving groundwater quality in a saline coastal aquifer. As part of this study, an extensive analysis of hydrogeochemical processes was conducted within a combined MAR structure featuring a percolation pond and recharge shaft, along with the nearby observation piezometers from 2012 to 2019. Over 300 water samples from the MAR structure and the piezometers were analysed to assess the enhancement in groundwater storage and quality in the nearby area. The electrical conductivity of groundwater was reduced from 1801 to 149 μS/cm in the MAR structure and from 2627 to 183, 41,212 to 9127 and 70, 345 to 2933 μS/cm, respectively, in the piezometers P1, P2 and P3 drilled up to different depths. The major hydrogeochemical facies in MAR structure and piezometers are Na⁺-Cl^- and Ca²⁺-Cl^- types, indicating the influence of seawater mixing and base exchange of Na⁺ and Ca²⁺ ions. The principal component analysis identified three significant components in pond and piezometers, contributing to a corresponding total variance of 90.85 % and 97.82 % with higher factor loadings for Na⁺, Cl⁻, and K⁺. Considering the benefits and the economic feasibility of these MAR structures, they are strongly recommended in other regions with sufficient rainfall and salinity-related challenges.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101480"},"PeriodicalIF":4.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive multifaceted analysis for unveiling the driving factors of groundwater decline","authors":"Saman Shahnazi ,&nbsp;Kiyoumars Roushangar ,&nbsp;Ata Allah Nadiri ,&nbsp;Hossein Hashemi","doi":"10.1016/j.gsd.2025.101482","DOIUrl":"10.1016/j.gsd.2025.101482","url":null,"abstract":"<div><div>Groundwater, as a vital water resource in arid and semi-arid regions, plays a crucial role in sustaining human livelihoods, agriculture, and industry. Over recent decades, these areas have witnessed rapid groundwater depletion, raising concerns about resource sustainability. This research provides a comprehensive analysis of the factors contributing to the decline in groundwater levels (GWL) within the Marand Plain, a heavily exploited area with complex groundwater dynamics in northwestern Iran. To achieve this objective, a novel approach based on Maximal Overlap Discrete Wavelet Transform (MODWT) entropy analysis was introduced to explore the complexities governing the groundwater system across various periods. The next step involved conducting a non-parametric trend analysis of the GWL through Mann-Kendall tests to interpret declining trends in relation to hydro-climatological factors and vegetation dynamics represented by NDVI. In the final phase, the study employed Wavelet Transform Coherence (WTC) and Partial Wavelet Coherence (PWC) to thoroughly examine scale-dependent control of various surface factors within the groundwater system., The findings indicate a limited impact of climate change parameters on the GWL decline. However, the results highlight the significance of vegetation dynamics, driven by land use changes, as a primary factor contributing this decline.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101482"},"PeriodicalIF":4.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical response of aquifers to intensive groundwater pumping for rice-rice rotation","authors":"M.G. Mostofa Amin,&nbsp;Atiqur Rahman,&nbsp;Most. Sumiya Akter,&nbsp;Md. Mamun Rana,&nbsp;Md Shariot-Ullah","doi":"10.1016/j.gsd.2025.101485","DOIUrl":"10.1016/j.gsd.2025.101485","url":null,"abstract":"<div><div>Extensive irrigated rice cultivation is often blamed for endangering groundwater resources. Therefore, the study aims to assess the hydro-geochemical properties of the geologic formation, investigate the hydro-geophysical impacts, and quantify the groundwater recharge and nutrient leaching potential, nutrient accumulation in geologic formation, and nutrient dynamics in the aquifers. Soil samples from the geologic formation were collected at 3-m intervals. Two observation wells were used to measure water level and nutrient dynamics. Field lysimeters assessed groundwater recharge potential and nutrient leaching. A test drilling and three pumping tests revealed that a 38-m clay layer separates an upper shallow aquifer from a deep confined aquifer (storage coefficient of 0.00051 and transmissibility of 2151 m²/day). Pumping tests resulted in a 0.8–1.1 m drawdown in the deep (pumping) aquifer, but an elastic subsidence of 5.7–9.1 mm caused a decrease in the water table depth of the shallow aquifer. Groundwater level peaked in October and followed a sharp decline during the Boro rice season (January–April) because of extraction for irrigation. The nutrient concentrations in the geologic layers (0.43–1.41 g N/kg and 4.02–32.16 mg P/kg) were relatively higher with higher clay content. Nitrogen levels in groundwater increased in the wet rice season and decreased in the dry season, whereas P was higher in the dry season due to varying transport and degradation rates. The rice fields had a huge groundwater recharge potential (38–74 % of water input) and moderate nutrient leaching (1–6.7 mg N/L and 0.05–0.63 mg P/L). However, nutrient concentrations in groundwater were sometimes even higher than the leaching concentrations. These results will help create an irrigation and nutrient management plan for rice cultivation. Increasing rainfed rice production would reduce the demand for irrigated Boro rice production and can have multifaceted positive effects on agricultural water security.</div></div>","PeriodicalId":37879,"journal":{"name":"Groundwater for Sustainable Development","volume":"30 ","pages":"Article 101485"},"PeriodicalIF":4.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}