Exploring the geochemical mechanism for the saturated permeability change of remolded loess

Xu, Panpan; Zhang, Qiying; Qian, Hui; Guo, Meng; Yang, Faxuan

doi:10.1016/j.enggeo.2020.105927

Cited by 20 publications

(6 citation statements)

References 61 publications

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“…Maximum F – levels in groundwater samples have been shown below the 1:1 line which indicated the enrichment of Na + in groundwater due to the cation exchange and salinity effect . The ratio of (HCO 3 – + SO 4 2– ) and (Ca 2+ + Mg 2+ ) was found >1 which indicated that dolomite dissolution was dominant along with calcite precipitation caused by the dissolution of gypsum, and this observation is well supported by other studies. , The alkaline groundwater and silicate weathering aided the fluorinated host material to solubilize F – and leach into the groundwater, resulting in a high concentration of Na + and low Ca 2+ . , The solubility of F – bearing silicate minerals such as biotite and muscovite, where both have a substantial impact on the solubility of F – in groundwater. However, geochemically, in alkaline circumstances, F – and OH – ions have the same atomic charge and ionic radius, which makes it easier for them to replace one another in biotite and muscovite.…”

Section: Resultssupporting

confidence: 80%

Investigation of Groundwater Fluoride Dynamics in the Lower Gangetic Plain Including Natural Influences with Economic and Health Issues

De,

Das,

Joardar

et al. 2024

ACS EST Water

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The lower Gangetic Plain in West Bengal, India, has previously been reported to have groundwater fluoride (F − ) contamination and its hazard; however, more information was needed about the precise location of contamination. The current study highlighted these knowledge gaps covering the toxicity of F − through groundwater by emphasizing the role of hydrogeochemical attributions in F − mobilization, people's socioeconomic behavior, and assessing the possible health risks of the local population. Approximately, 10% of groundwater samples exceeded the recommended value of F − with a moderate contamination factor. The groundwater is highly saline (Na−Cl type) in nature. The intermediate zone between the area of 'rock dominance' and 'precipitation dominance' controlled the leaching of F − from host silicate minerals to groundwater. The saturation index established geogenic activity as the responsible factor and found silicate weathering mineral muscovite for F − leaching in groundwater. The average utility cost for 20 L of safe drinking water was US$ 7.58 per month from affordable households. Total hazard quotient (THQ) was observed maximum for infants and significant ingestion rate (IR), body weight (BW), and body surface area (SA) were the responsible factors for the studied age groups. Fluoride-safe drinking water supply strategies are a necessary step in the studied area.

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Section: Resultssupporting

confidence: 80%

Investigation of Groundwater Fluoride Dynamics in the Lower Gangetic Plain Including Natural Influences with Economic and Health Issues

De,

Das,

Joardar

et al. 2024

ACS EST Water

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“…With the development of the western region and the promotion of the Belt and Road strategy, the northwest of China, as a key area of the Silk Road, plays an indispensable role in promoting international exchanges and development [1]. As an important leading city in the belt and road initiative, Xi'an plays an important role in promoting international cooperation and realizing mutual win-win between economy and ecology [2].…”

Section: Introductionmentioning

confidence: 99%

Study on the relationship between phreatic level and water quality: a case study of city in northwest China

Liu

Qian

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Phreatic is an important water resource for human survival and development. With the process of urbanization, diving in many areas has been polluted to varying degrees. In order to find out the existing relationship between phreatic level and water quality, in this study, 53 Wells in the main urban area of Xi’an in 2017 were selected to map and analyze the submersible water level, and the improved fuzzy comprehensive evaluation was used to evaluate the submersible water quality. The results show that the change of phreatic level is closely related to the fluctuation of terrain. The improved fuzzy comprehensive evaluation method can well reflect the phreatic quality in the study area, and it is universal. There is a linear relationship between phreatic level and water quality. Due to the flow in phreatic water, the polluted phreatic in the upstream will pollute it in the downstream. This is also the reason why the water quality along the Weihe River is poor. This study has positive significance for the good development of phreatic protection and the construction of human life in the study area.

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“…erefore, its permeability will also show obvious differences. e structure of loess is different at different depths, and the anisotropy of infiltration along the depth direction is stable [14,15]. e pore structure of compacted loess changes, and the horizontal permeability coefficient will be greater than the vertical permeability coefficient.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of Soil Structure Index on Loess Permeability

Ren

Wang

Wentong

2022

Advances in Materials Science and Engineering

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In order to study the effects of dry density and initial water content on the permeability characteristics of loess, the saturated permeability tests of undisturbed loess and remolded loess were carried out in Lanzhou New Area. The anisotropy of undisturbed loess under two factors is analyzed and compared, and the permeability difference between undisturbed loess and remolded loess is also analyzed. The results show that the structure of loess has an important impact on the permeability characteristics, and the dry density is an important structural parameter. The natural structure of undisturbed loess has obvious anisotropy. Under different pore conditions and water contents, it will show the anisotropic behavior of permeability. The influence of water content on permeability is mainly reflected in the influence on the properties of cement between soil particle skeletons. Under different dry density conditions, the influence of water content on permeability is different. When the pore structure is relatively compact, the influence of water content is more obvious. In practical engineering, these two factors need to be comprehensively considered in order to accurately describe the permeability distribution of loess. This study can provide some theoretical guidance for the construction of relevant loess projects.

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Exploring the geochemical mechanism for the saturated permeability change of remolded loess

Cited by 20 publications

References 61 publications

Investigation of Groundwater Fluoride Dynamics in the Lower Gangetic Plain Including Natural Influences with Economic and Health Issues

Investigation of Groundwater Fluoride Dynamics in the Lower Gangetic Plain Including Natural Influences with Economic and Health Issues

Study on the relationship between phreatic level and water quality: a case study of city in northwest China

Experimental Study on the Influence of Soil Structure Index on Loess Permeability

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