Groundwater quality changes in peri-urban areas of the Walloon region of Belgium

Gesels, Julie; Dollé, Fabien; Leclercq, Julie; Jurado, Anna; Brouyère, Serge

doi:10.1016/j.jconhyd.2021.103780

Cited by 14 publications

(6 citation statements)

References 34 publications

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“…However, the marked decrease in DO cannot be fully explained by the increasing groundwater temperatures. The distinctive increase in EC indicates gradual groundwater contamination by organic contaminants, which can be reasonably inferred from the decreasing DO and lowering ORP (Choi & Lee, 2011;Gesels et al, 2021).…”

Section: Groundwater Qualitymentioning

confidence: 88%

Groundwater development, use, and its quality in Korea: tasks for sustainable use

2021

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In this study, the current state of groundwater development and use and groundwater quality has been examined based on official groundwater data collected from the Republic of Korea. The groundwater data indicate a steady increase in the number of groundwater wells and an increase in groundwater pumping. The well diameters also increase with increasing well depth, owing to the development of drilling technology. Although groundwater is predominantly used for agricultural and living purposes, the former has recently outnumbered the latter. According to the groundwater quality monitoring stations covering the entire country, the groundwater levels, dissolved oxygen, and oxidation–reduction potential decrease with a steady increase in the water temperature, pH, and electrical conductivity, indicating an aggravating groundwater environment in this region. The most concerning contaminants found are nitrate, ammonia, arsenic, zinc, toluene, xylene, chloroform, and fluoride. Thus, based on these observations, we propose three essential tasks for sustainable groundwater use: a paradigm shift in groundwater management, conjunctive use and integrated management of groundwater and stream water, and groundwater governance and data quality control.

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Section: Groundwater Qualitymentioning

confidence: 88%

Groundwater development, use, and its quality in Korea: tasks for sustainable use

2021

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“…The contour map shown in Fig 7 indicates that hydrostatic pressure is high in the northern portion of the study area. Whereas the rest of the area shows a very gentle pattern of contours which indicate low hydrostatic pressure on the ground waters of the area (Gesels et al, 2021).…”

Section: Fig 7: Static Water Levels Across Greater Noidamentioning

confidence: 99%

Analysing Effects on Ground Water Levels Due to Conversion of Rural to Urban Landscapes

Kumar

Veerabhadrappa

2022

Journal of Landscape Ecology

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Greater NOIDA evolved from 1991 with 101 villages to 2020 with 293 villages. This is an ideal case of rural to urban transformation in the immediate past. This transformation led to a decrease in recharging natural surfaces and an increase in impermeable surfaces. Along with the reduction in recharge areas, an increase in population has necessitated more and more extraction of groundwater resulting in an imbalance of water extraction and recharge. The result is depletion of groundwater levels in this area. The area is part of the wide Indo-Gangetic alluvium with sand, silt and clay layers resting on quartzite’s of Delhi Super Group. Geomorphological map prepared using digital elevation models of the area shows older and younger alluvial plains and active flood plains of the river Hindan. Time series analysis of key land use land cover classes shows that recharge areas were reduced from 77 % to 30 % from 2005 to 2019 and impervious surfaces have increased from 19 % to 65 % for the same period. Aquifers of the area are both phreatic and semi-confined. The aquifer parameters estimated through step drawdown test and long duration aquifer performance test indicates that the average coefficient of transmissivity of the area is 1752 m2/day and the average coefficient of storage is 4.84 x 10-4. Discharge of the wells shows a yield of 8 to 16 lps for a drawdown of 3 to 6 m. An attempt has been made to know the behaviour of groundwater levels during the same period as that of land use land cover. The results indicate a 74 % depletion in groundwater levels with an average annual depletion of 21 %. An interrelationship between urban growth and groundwater levels has been established in this study. This analysis indicates that as agriculture declined water levels also depleted and have a positive correlation of 0.852. On the contrary, as the built-up increased water level has depleted hence have a negative relationship with a correlation coefficient of -0.851. To make it a sustainable resource, these overexploited aquifers need careful participatory management by communities, Scientists, and policymakers.

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“…Hence, to improve the quality of groundwater used for drinking, most countries and health organizations have established drinking water quality guidelines for Sb; these values include 0.020 mg/L as set by the World Health Organization [3], 0.006 mg/L by the United States [4], 0.005 mg/L by the European [5] and China [6]. High-Sb groundwater (commonly: >0.005 mg/L) has been widely reported in mining areas globally, particularly in Slovakia [7], Scotland [8], Australia [9], Portugal [10], Egypt [11], Italy [12], Mexico [13], Luxembourg [14], China [15]. In China, high-Sb groundwater is distributed in the Hunan, Guangxi, Guizhou, Yunnan, and Tibet provinces [15].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Sources of Dissolved Organic Matter in High-Antimony Shallow Groundwater in the Xikuangshan Mine, Hunan, China

Peng¹,

Hao²,

Gu³

2022

Pol. J. Environ. Stud.

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The origin and composition of dissolved organic matter (DOM) is crucial for fate of antimony (Sb) in aquatic systems. However, there are in which DOM compositional properties, that may better explain the biogeochemical process of Sb, have been absent. This study aimed to understand the fraction, spatial distribution, and spectral characteristics of DOM in high-Sb groundwater (commonly: >0.005 mg/L) from the Xikuangshan Mine in Lengshuijiang, Hunan, China, and explore the characteristics of DOM associated with the formation process of high-Sb groundwater. Inductively coupled mass spectrometry and excitation/emission matrix-parallel factor analysis were used to determine the Sb content, DOM composition, and fluorescence characteristics of 25 shallow groundwater samples collected in May 2021. The dissolved organic carbon (DOC) values in the shallow groundwater varied from 0.38±1.89 to 9.90±1.89 mg/L, with a mean of 2.49 mg/L. The DOM consisted of the following four components: C1, terrestrial humus; C2, microbial humus; C3, fulvic acid; and C4, tryptophan. DOM in high-Sb groundwater usually has a high humification index, low biological index, and low fluorescence intensity values. This result will help to understand the effect of DOM on the accumulation and migration of antimony in groundwater during biogeochemical cycling.

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Groundwater quality changes in peri-urban areas of the Walloon region of Belgium

Cited by 14 publications

References 34 publications

Groundwater development, use, and its quality in Korea: tasks for sustainable use

Groundwater development, use, and its quality in Korea: tasks for sustainable use

Analysing Effects on Ground Water Levels Due to Conversion of Rural to Urban Landscapes

Spatial Distribution and Sources of Dissolved Organic Matter in High-Antimony Shallow Groundwater in the Xikuangshan Mine, Hunan, China

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