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Saline paleo-water mass transfer induced by piston flow in the continental alluvial aquifer of the Oltrepò Pavese plain (Po Plain, northern Italy) 意大利北部波河平原 Oltrepò Pavese 平原大陆冲积含水层活塞流引起的古盐水质量转移
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-04-20 DOI: 10.1007/s10040-024-02790-2
Giorgio Pilla, Patrizio Torrese
{"title":"Saline paleo-water mass transfer induced by piston flow in the continental alluvial aquifer of the Oltrepò Pavese plain (Po Plain, northern Italy)","authors":"Giorgio Pilla, Patrizio Torrese","doi":"10.1007/s10040-024-02790-2","DOIUrl":"https://doi.org/10.1007/s10040-024-02790-2","url":null,"abstract":"<p>Hydrochemical and geophysical methods were used to assess saline paleo-water mass transfer induced by piston flow in the alluvial aquifer of the Oltrepò Pavese plain (northern Italy). The surface aquifer shows salinity contamination from a Tertiary substrate of marine origin, due to mixing of the shallower fresh groundwater with the Po Plain’s deep brines. The study also used continuous monitoring of groundwater electrical conductivity, temperature and piezometric levels. Well logging and geophysical imaging, conducted at different times, revealed that the contamination varies over time, and that the water salinity and the depth of the transition zone (between the surface freshwaters and the deep saline waters) are subject to modifications. This is due to a pressure transfer—and, subsequently, mass transfer−from the groundwater circuits of the nearby Apennine mountains. It suggests that a hydraulic connection exists between the fractured Apennine water circuits and the deeper Mio-Pliocene and Tertiary saline-water circuits found below the plain’s alluvial aquifer. Coinciding with significant recharge episodes that affect Apennine water circuits (prolonged rainfall and snow melt at mid-high altitudes), there is a pressure transfer transmitted along the water circuits in which saline water resides, providing an impulse to rise along the discontinuities and reach the alluvial aquifer. The conceptual model is supported by evidence that wells constructed in correspondence to hydraulically active tectonic discontinuities are affected by the arrival of saline waters with variable delays, while wells sited in sectors not affected by tectonic discontinuities are diluted by ‘fresh’ waters connected to alluvial aquifer recharge.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"2013 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140623107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Present and paleo-hydrogeological reconstruction of a complex deep groundwater system in a tectonically active region (Golan Heights, Middle East) 构造活跃地区(中东戈兰高地)复杂深层地下水系统的现状和古水文地质重建
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-04-17 DOI: 10.1007/s10040-024-02782-2
Hadas Ben-nun Levanon, Avihu Burg, Ittai Gavrieli, Yoav O. Rosenberg, Ronen Gersman, Yuval Bartov, Yakov Livshitz, Avraham Starinsky, Itay J. Reznik
{"title":"Present and paleo-hydrogeological reconstruction of a complex deep groundwater system in a tectonically active region (Golan Heights, Middle East)","authors":"Hadas Ben-nun Levanon, Avihu Burg, Ittai Gavrieli, Yoav O. Rosenberg, Ronen Gersman, Yuval Bartov, Yakov Livshitz, Avraham Starinsky, Itay J. Reznik","doi":"10.1007/s10040-024-02782-2","DOIUrl":"https://doi.org/10.1007/s10040-024-02782-2","url":null,"abstract":"<p>The geochemical and isotopic composition of deep groundwater in sedimentary aquitards reveals a complex paleo-hydrological system affected by intensive tectonic activity. Water samples collected from deep research boreholes in the Golan Heights (Middle East) exhibit a unique combination of high salinity (&gt;2,000 mg/L Cl) with low Na/Cl (&lt;0.7) and Mg/Ca (&lt;0.3) equivalent ratios, calcium chloride water type [Ca &gt; (HCO<sub>3</sub> + SO<sub>4</sub>)], relatively low δ<sup>18</sup>O<sub>VSMOW</sub> and δ<sup>2</sup>H<sub>VSMOW</sub> values (–7 and –42‰, respectively), and enriched <sup>87</sup>Sr/<sup>86</sup>Sr ratios compared to the host rocks. The salinity source is related to ancient lagoonary hypersaline brines (10–5 Ma) that existed along the Dead Sea Rift (DSR). These brines intruded into the rocks surrounding the DSR and, based on the current study, also extended away from the rift. Following their subsurface intrusion, the brines have been gradually diluted by <sup>18</sup>O- and <sup>2</sup>H-depleted freshwater recharged at high elevations, nowadays leaving only traces of the brines that originally intruded. It is also shown that variable hydraulic conductivities in different formations control the dilution rates and subsequently the preservation of the entrapped brines. A paleo-hydrological reconstruction is provided to demonstrate intrusion and backflow dynamics and also the relationship to freshwater dilution, which was triggered by a tectonically active basin of the nearby continental DSR. Brines that initially migrated from the rift have since been gradually flushed back to the rift through the current natural outlets. As the system discharges, it mixes and converges with a separate hydrogeological system, while still preserving some of the geochemical signals of the ancient brines.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"13 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140609316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of bioclogging on the hydraulic conductivity of saturated porous media at different recharge water temperatures 不同补给水温度下生物积木对饱和多孔介质导水性的影响
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-04-03 DOI: 10.1007/s10040-024-02785-z
Shilin Wang, Liping Chen, Yanfeng Gong, Suning Ma, Yong Yang
{"title":"The effect of bioclogging on the hydraulic conductivity of saturated porous media at different recharge water temperatures","authors":"Shilin Wang, Liping Chen, Yanfeng Gong, Suning Ma, Yong Yang","doi":"10.1007/s10040-024-02785-z","DOIUrl":"https://doi.org/10.1007/s10040-024-02785-z","url":null,"abstract":"<p>Bioclogging in porous media is common and affects many engineering projects. The temperature of recharge water could significantly affect the process of bioclogging, thus impacting the hydraulic conductivity of porous media. In this study, a series of laboratory percolation experiments was conducted to understand the effects of recharge water temperature. The results of these experiments showed that bioclogging evolved in phases, and the gradual reduction (attenuation) of hydraulic conductivity caused by bioclogging could be described by an inverse logistic model. Analysis of microbial growth suggested that the bioclogging phases were strongly correlated with microbial growth stages. Both the clogging rate and degree of clogging through the seepage column decreased with distance from the inlet. Within the range of 10–25 ℃, the degree of clogging decreased with the increasing recharge water temperature; however, the degree of clogging increased with recharge water temperature within the range of 25–35 ℃. The relative hydraulic conductivity values decreased by 86.9% at a recharge water temperature of 10 ℃, 76.0% at 15 ℃, 65.1% at 20 ℃, 44.9% at 25 ℃, 82.5% at 30 ℃ and 98.7% at 35 ℃. Investigation by scanning electron microscopy found that the microorganism micromorphology differed at different recharge water temperatures, which made a significant difference in terms of clogging degree. A comprehensive model that describes hydraulic conductivity attenuation with varying recharge water temperature has been developed.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"67 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140585855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Migration and transformation mechanisms of iron in clayey sediments during compaction: studies using simulation experiments 压实过程中粘土沉积物中铁的迁移和转化机制:模拟实验研究
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-04-03 DOI: 10.1007/s10040-024-02783-1
Rui Liu, Teng Ma, Xinyan Liu, Yantao Jian, Juan Chen
{"title":"Migration and transformation mechanisms of iron in clayey sediments during compaction: studies using simulation experiments","authors":"Rui Liu, Teng Ma, Xinyan Liu, Yantao Jian, Juan Chen","doi":"10.1007/s10040-024-02783-1","DOIUrl":"https://doi.org/10.1007/s10040-024-02783-1","url":null,"abstract":"<p>The behavior of iron (Fe) in clayey aquitards has a significant effect on the groundwater environment. However, the release processes and impact of Fe within clayey sediments during compaction remain unknown. Two groups of simulation experiments were carried out to demonstrate the migration and transformation mechanisms of Fe during clayey sediment compaction. Experiment A, which simulated a natural deposition condition, revealed that pressurization changed the reaction environment from oxidative to reductive by isolating oxygen. Oxidation of ferrous ions was followed by reduction dissolution of poorly crystalline Fe (III) and crystalline Fe (III) oxides. Under the microbial utilization of organic matter, the main transformation process of sediment Fe was the dissimilatory reduction of poorly crystalline Fe (III) oxides. The total Fe concentration in pore water was 0.09–11.61 mg/L, with ferrous ions predominating among the Fe species. The lower moisture content (<span>(text{&lt;})</span>~36%) in the later stage of compaction inhibited the dissimilatory reduction of Fe (III), and the formation of Fe (II) minerals resulted in a decrease in Fe concentration. Experiment B, which simulated an artificial compaction state, revealed that the sediment Fe was primarily released by physical dissolution because of changes in pore structure and solubility. The concentration of total Fe in pore water was 0.02–1.96 mg/L, with a significant increase in response to a rapid increase in pressure. According to the estimates in the Chen Lake wetland (eastern China), the contribution of clay pore water release accounted for 19.9–31.9% of the average Fe concentration in groundwater during natural deposition.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"76 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140585860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of fracture aperture and matrix permeability on suitability of the equivalent porous medium model for steady-state flow in fractured porous media 断裂孔径和基质渗透性对等效多孔介质模型在断裂多孔介质稳态流动中适用性的影响
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-03-08 DOI: 10.1007/s10040-024-02781-3
Di Han, Lei Ma, Jiazhong Qian, Di Gao, Haichun Ma, Qiankun Luo, Pengyu Qiu
{"title":"The effect of fracture aperture and matrix permeability on suitability of the equivalent porous medium model for steady-state flow in fractured porous media","authors":"Di Han, Lei Ma, Jiazhong Qian, Di Gao, Haichun Ma, Qiankun Luo, Pengyu Qiu","doi":"10.1007/s10040-024-02781-3","DOIUrl":"https://doi.org/10.1007/s10040-024-02781-3","url":null,"abstract":"<p>The equivalent porous medium (EPM) method is an efficient approximate processing method for calculating groundwater yield taking into account the equivalent permeability coefficient of a fractured geological medium. The EPM method finds wide application in addressing various hydrogeological problems ranging from local to regional scales; however, the adequacy of the EPM model for evaluating water head and velocity distributions has not been comprehensively assessed. This study quantitatively investigated the influence of fracture and matrix permeability on the EPM model’s suitability, defined by a 15% threshold for hydraulic-head prediction error, via numerical simulations. A fractured porous media system (fracture-matrix system) was considered as the prototype, and the EPM model simulation results were compared with those obtained using the discrete fracture-matrix (DFM) model. Results indicate a decrease in EPM suitability with larger fracture apertures. With a constant fracture aperture, the suitability of the EPM model increases as the matrix permeability increases. The size of the fracture aperture significantly affects the suitability of the EPM model, and it determines the point at which its suitability begins to increase and eventually stabilize. The fitted curve depicting the influence of matrix permeability on the suitability of the EPM model conforms to the Boltzmann formula, and the fracture aperture is linearly related to the parameter <i>x</i><sub>0</sub> in the formula. The derived empirical formula enables quantitative assessment of the impact of fracture and matrix permeabilities on the suitability of the EPM model in fractured porous media.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"21 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140070688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vertical hydraulic conductivity and layered heterogeneity: from measurements to models 垂直导水性和层状异质性:从测量到模型
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-03-08 DOI: 10.1007/s10040-024-02773-3
Martin G. Shepley
{"title":"Vertical hydraulic conductivity and layered heterogeneity: from measurements to models","authors":"Martin G. Shepley","doi":"10.1007/s10040-024-02773-3","DOIUrl":"https://doi.org/10.1007/s10040-024-02773-3","url":null,"abstract":"<p>Published laboratory and field estimates of vertical hydraulic conductivity (<i>K</i><sub>v</sub>) and the anisotropy ratio (<i>K</i><sub>h</sub>/<i>K</i><sub>v</sub>, where <i>K</i><sub>h</sub> is horizontal hydraulic conductivity) have been compared with equivalent groundwater model values, mainly for sedimentary strata. The results show that model <i>K</i><sub>v</sub> values tend to be higher and <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> values tend to be lower than field estimates for vertical length scales ≥10 m, particularly for coarse-grained unlithified sediments. This difference is attributed to the widespread use of the assumption of <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> = 1 and particularly <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> = 10 in groundwater models, regardless of the length scale or strata type represented. The origin of the <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> = 10 assumption is obscure and not founded on rigorous data analysis. <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub>, and by inference <i>K</i><sub>v</sub>, is frequently an unimportant parameter in model construction and calibration. On balance, this model artefact is attributed to the common reliance on summary head calibration statistics that hide the inadequacies of the MODFLOW paradigm (<i>K</i><sub>xx</sub> = <i>K</i><sub>yy</sub> = <i>K</i><sub>h</sub>, <i>K</i><sub>zz</sub> = <i>K</i><sub>v</sub>) when used for large-scale hydrostratigraphic units with uniform parameterization, fixed <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub>, and 1 ≤ <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> ≤ 10. However, thin, high-permeability aquifer models or well-defined aquifer/aquitard models are examples where such simplifying assumptions for <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> are workable, given groundwater quantity objectives. More realistic model values of <i>K</i><sub>v</sub> and <i>K</i><sub>h</sub>/<i>K</i><sub>v</sub> at length scales greater than field estimates could be obtained by independent calibration of <i>K</i><sub>v</sub> and <i>K</i><sub>h</sub>, use of larger-scale field estimates of <i>K</i><sub>v</sub> and multi-level piezometer/observation wells, and calibration to vertical head gradients separate from summary head calibration statistics.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"34 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140070719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A quantitative composition calculation model of mine water source based on “emblematic ions” 基于 "标志性离子 "的矿井水源定量成分计算模型
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-03-06 DOI: 10.1007/s10040-024-02774-2
Huiqing Yuan, Zhimin Xu, Yajun Sun, Li Zhang, Ge Chen
{"title":"A quantitative composition calculation model of mine water source based on “emblematic ions”","authors":"Huiqing Yuan, Zhimin Xu, Yajun Sun, Li Zhang, Ge Chen","doi":"10.1007/s10040-024-02774-2","DOIUrl":"https://doi.org/10.1007/s10040-024-02774-2","url":null,"abstract":"<p>Preventing water inrush disasters in mines is crucial for ensuring safe coal production; therefore, it is necessary to adopt a simple and effective method to determine the source and composition of mine water for effective water control in coal mines. The major ions content of groundwater in mining areas is easy to monitor, but the selection of appropriate parameters and calculation methods is key to being able to accurately discriminate between the water sources. In this study, the major ions content of 18 water samples was analyzed by cluster analysis, and a set of mean reference values was constructed for these ions in the mine-impacted groundwater of the saturated aquifers. The coefficient of variation was used to screen the parameters suitable for calculating the composition of mine water, and an innovative concept of characteristic ions, hereby defined as “emblematic” ions, was put forward. These were identified in this study as K<sup>+</sup> + Na<sup>+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup> and HCO<sub>3</sub><sup>–</sup>. The quantitative calculation model of the mine water source is established by using the fuzzy comprehensive evaluation method with the emblematic ions as the evaluation factor. Finally, the accuracy of the mathematical model is verified by comparing the calculated data with the actual observation data.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"23 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140045539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using major ions and stable isotopes to improve conceptualisation of a spring-aquifer system in the Galilee Basin, Australia 利用主要离子和稳定同位素改进澳大利亚加利利盆地泉水-含水层系统的概念设计
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-03-04 DOI: 10.1007/s10040-024-02777-z
Robin Keegan-Treloar, Eddie W. Banks, Ian Cartwright, Dylan J. Irvine, John A. Webb, Adrian D. Werner, Matthew J. Currell
{"title":"Using major ions and stable isotopes to improve conceptualisation of a spring-aquifer system in the Galilee Basin, Australia","authors":"Robin Keegan-Treloar, Eddie W. Banks, Ian Cartwright, Dylan J. Irvine, John A. Webb, Adrian D. Werner, Matthew J. Currell","doi":"10.1007/s10040-024-02777-z","DOIUrl":"https://doi.org/10.1007/s10040-024-02777-z","url":null,"abstract":"<p>Developing conceptual models is a critical step in hydrogeological studies that should utilise multiple lines of evidence and data types to minimise conceptual uncertainty, particularly in data-sparse systems. This study used new and existing major ion and isotope (O, H, Sr, C) data sets to refine a previous hydraulic-head-based conceptual model of the Galilee Basin (Australia). The analyses provide evidence for the locations of recharge and discharge areas and determine hydrochemical processes along flow paths to improve understanding of potential source waters to the Doongmabulla Springs Complex (DSC) and to infer mixing within, or exchange between aquifer units. There was good agreement between previously inferred recharge and discharge areas defined using hydraulic head data and interpretations from hydrochemical evolution along groundwater flow pathways, at least where data were available. Major ion and isotope data suggest that the DSC likely receives water from both a relatively shallow, local flow path and a deeper regional flow path. This observation is relevant to previous concerns about threats to the DSC, as mine-induced drawdown may impact the relative contributions to spring discharge from different recharge sources and aquifers. Silicate weathering in the deeper Clematis Formation and Dunda Beds, and evapotranspiration in the overlying Moolayember Formation have strong control on the total dissolved solids content. These findings suggest that the Clematis Formation and Dunda Beds are hydrochemically distinct from the Moolayember Formation, with limited exchange between these aquifers, which has important implications for model conceptualisation and ongoing monitoring of mining activities in the Galilee Basin.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"10 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The seepage field around twin noncircular tunnels in anisotropic sloping 各向异性斜坡中双子非圆形隧道周围的渗流场
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-03-04 DOI: 10.1007/s10040-024-02767-1
Fengran Wei, Huaning Wang, Guangshang Zeng
{"title":"The seepage field around twin noncircular tunnels in anisotropic sloping","authors":"Fengran Wei, Huaning Wang, Guangshang Zeng","doi":"10.1007/s10040-024-02767-1","DOIUrl":"https://doi.org/10.1007/s10040-024-02767-1","url":null,"abstract":"<p>A new and efficient theoretical model for studying the seepage field around two noncircular tunnels in sloping ground is proposed through analytical derivation. The model considers the exact interaction between two tunnels with arbitrary shapes and locations, as well as the permeability anisotropy, whose principal orientation is along any direction. By applying the Schwartz alternating method and conformal mapping, the analytical solutions of the hydraulic head and pore pressure can be obtained. These solutions strictly satisfy all governing equations and conditions. The correctness and accuracy of the analytical solutions are verified by the good agreement between the theoretical and numerical results. The proposed theoretical model can be applied to the cases with any tunnel shape, slope angle, anisotropic direction and degree. The quantitative influences of the anisotropy ratio, slope angle and tunnel shape on the seepage field are obtained, and some useful charts are provided. The proposed model can efficiently and quickly predict the seepage flow around tunnels in anisotropic sloping ground.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"123 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Textile dyes as a source of groundwater contamination in Mandalay, Myanmar 作为缅甸曼德勒地下水污染源的纺织品染料
IF 2.8 3区 地球科学
Hydrogeology Journal Pub Date : 2024-02-21 DOI: 10.1007/s10040-024-02775-1
Surya M. Freeman, Chit Wityi Oo, Melissa E. Lenczewski, Moe Myint Kyaw
{"title":"Textile dyes as a source of groundwater contamination in Mandalay, Myanmar","authors":"Surya M. Freeman, Chit Wityi Oo, Melissa E. Lenczewski, Moe Myint Kyaw","doi":"10.1007/s10040-024-02775-1","DOIUrl":"https://doi.org/10.1007/s10040-024-02775-1","url":null,"abstract":"<p>Textile dyeing and weaving of traditional longyi garments have traditionally occurred in the Amarapura township of Mandalay, Myanmar, since 1822, transitioning from natural to chemical dyes in the early 1900s. With no current wastewater treatment facilities in Mandalay, dye effluents mix with other wastewaters in unlined canals dug near people’s homes and discharge into the local canals and groundwater. Because locals rely heavily on dug and tube wells for drinking, bathing, and cooking, this industry poses a major health hazard to the people in this region. The objective of this study was to identify the previously unknown composition of the textile dyes, as well as identify and quantify the concentrations of major ions and heavy metals found in dye effluents, and determine their impact on the local groundwater resources. Powdered dye samples from each stage of the dyeing process were characterized by the combination of heavy metals used to create these color dyes. Groundwater and surface water were also sampled. Results of analysis of the dye and water samples indicated that most of the heavy metals discharge into the groundwater environment. Textile dyeing is a major source of pollution and a health hazard to the residents of Amarapura township; however, the locals are not readily connecting dye practices to the issues with their drinking water. This study provides information on groundwater composition near dyeing industries in Amarapura township that may help inform further monitoring strategies and communicate the health risks of exposure to heavy metals for local people.</p>","PeriodicalId":13013,"journal":{"name":"Hydrogeology Journal","volume":"29 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139928253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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