Acidification of shallow groundwater in the unconfined sandy aquifer of the city of Douala, Cameroon, Western Africa: implications for groundwater quality and use

2015 ◽  
Vol 74 (9) ◽  
pp. 6831-6846 ◽  
Author(s):  
G. E. Takem ◽  
D. Kuitcha ◽  
A. A. Ako ◽  
G. T. Mafany ◽  
A. Takounjou-Fouepe ◽  
...  
Keyword(s):  
Groundwater Quality ◽  
Shallow Groundwater ◽  
Western Africa ◽  
Sandy Aquifer ◽  
The City

scholarly journals Transformation of the groundwater composition in coastal zone of the Ivankovo reservoir during 20 years

2021 ◽  
Vol 35 (1) ◽  
pp. 3-14
Author(s):  
Elena Lapina ◽  
Larisa Lapina ◽  
Vera Kudryashova
Keyword(s):  
Chemical Composition ◽  
Groundwater Quality ◽  
Atmospheric Precipitation ◽  
Shallow Groundwater ◽  
Winter Period ◽  
Ivankovo Reservoir ◽  
Water Quality Status ◽  
The City ◽  
Term Monitoring

The Ivankovo reservoir is an important source of drinking water for the city of Moscow. The water quality status of aquifers around the reservoir is important for its safety, as groundwater inflow into the reservoir is considerable. The chemical composition of the shallow groundwater around the Ivankovo reservoir is studied. The study is based on long-term monitoring (1999–2019) of both surface and groundwater quality. The aim of the paper is to identify changes in groundwater quality over this period and to determine their causes. The results show that over this 20 year-period, the groundwater quality in the study area shifted from HCO3–Ca to HCO3–Ca-Mg type, proven by statistical methods. The median values of the total dissolved solids (TDS) decreased by 13% in summer and by 17% in winter. It is shown that the ongoing processes of transformation of the groundwater chemical composition are mainly due to climate change, and atmospheric precipitation in the spring-winter period is a possible source of the Mg2+ ion entering the groundwater table. Among other components, concentrations of chlorides and sulfates underwent the largest change, the median values of which have decreased by two or more times, which is caused by both the dilution of the groundwater by melt water and a decrease in the anthropogenic load.

scholarly journals Nitrogen Mass Balance and Pressure Impact Model Applied to an Urban Aquifer

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1171 ◽  
Author(s):  
Mitja Janža ◽  
Joerg Prestor ◽  
Simona Pestotnik ◽  
Brigita Jamnik
Keyword(s):  
Groundwater Quality ◽  
Urban Areas ◽  
Transport Model ◽  
Nitrate Concentration ◽  
Impact Model ◽  
Sewer System ◽  
Management Measures ◽  
Pressure Impact ◽  
The Impact ◽  
The City

The assurance of drinking water supply is one of the biggest emerging global challenges, especially in urban areas. In this respect, groundwater and its management in the urban environment are gaining importance. This paper presents the modeling of nitrogen load from the leaky sewer system and from agriculture and the impact of this pressure on the groundwater quality (nitrate concentration) in the urban aquifer located beneath the City of Ljubljana. The estimated total nitrogen load in the model area of 58 km2 is 334 ton/year, 38% arising from the leaky sewer system and 62% from agriculture. This load was used as input into the groundwater solute transport model to simulate the distribution of nitrate concentration in the aquifer. The modeled nitrate concentrations at the observation locations were found to be on average slightly lower (2.7 mg/L) than observed, and in general reflected the observed contamination pattern. The ability of the presented model to relate and quantify the impact of pressures from different contamination sources on groundwater quality can be beneficially used for the planning and optimization of groundwater management measures for the improvement of groundwater quality.

Shallow groundwater quality on dairy farms with irrigated forage crops

2002 ◽  
Vol 55 (3-4) ◽  
pp. 287-315 ◽  
Author(s):  
Thomas Harter ◽  
Harley Davis ◽  
Marsha C Mathews ◽  
Roland D Meyer
Keyword(s):  
Groundwater Quality ◽  
Shallow Groundwater ◽  
Dairy Farms ◽  
Forage Crops

scholarly journals Assessing threats to shallow groundwater quality from soil pollutants in Glasgow, UK: development of a new screening tool

2017 ◽  
Vol 108 (2-3) ◽  
pp. 173-190 ◽  
Author(s):  
F. M. Fordyce ◽  
B. É. Ó Dochartaigh ◽  
H. C. Bonsor ◽  
E. L. Ander ◽  
M. T. Graham ◽  
...  
Keyword(s):  
Groundwater Quality ◽  
Soil Sample ◽  
Screening Tool ◽  
Shallow Groundwater ◽  
Groundwater Chemistry ◽  
Potential Threat ◽  
Quaternary Deposit ◽  
Metal Concentrations ◽  
High Soil ◽  
Very High

ABSTRACTA new GIS-based screening tool to assess threats to shallow groundwater quality has been trialled in Glasgow, UK. The GRoundwater And Soil Pollutants (GRASP) tool is based on a British Standard method for assessing the threat from potential leaching of metal pollutants in unsaturated soil/superficial materials to shallow groundwater, using data on soil and Quaternary deposit properties, climate and depth to groundwater. GRASP breaks new ground by also incorporating a new Glasgow-wide soil chemistry dataset. GRASP considers eight metals, including chromium, lead and nickel at 1622 soil sample locations. The final output is a map to aid urban management, which highlights areas where shallow groundwater quality may be at risk from current and future surface pollutants. The tool indicated that 13% of soil sample sites in Glasgow present a very high potential threat to groundwater quality, due largely to shallow groundwater depths and high soil metal concentrations. Initial attempts to validate GRASP revealed partial spatial coincidence between the GRASP threat ranks (low, moderate, high and very high) and groundwater chemistry, with statistical correlation between areas of high soil and groundwater metal concentrations for both Cr and Cu (r2>0.152; P<0.05). Validation was hampered by a lack of, and inconsistency in, existing groundwater chemistry data. To address this, standardised subsurface data collection networks have been trialled recently in Glasgow. It is recommended that, once available, new groundwater depth and chemistry information from these networks is used to validate the GRASP model further.

Arsenic-rich shallow groundwater in sandy aquifer systems buffered by rising carbonate waters: A geochemical case study from Mannar Island, Sri Lanka

2018 ◽  
Vol 633 ◽  
pp. 1352-1359 ◽  
Author(s):  
U.G.C. Bandara ◽  
Saranga Diyabalanage ◽  
Christian Hanke ◽  
Robert van Geldern ◽  
Johannes A.C. Barth ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Shallow Groundwater ◽  
Aquifer Systems ◽  
Sandy Aquifer

Assessing groundwater management sustainability of coastal cities by utilizing the City Blueprint Approach 

2021 ◽  
Author(s):  
Khawon Lee ◽  
Sun Woo Chang ◽  
Jeryang Park
Keyword(s):  
Water Management ◽  
Environmental Factors ◽  
Correlation Analysis ◽  
Groundwater Quality ◽  
Groundwater Management ◽  
Coastal Regions ◽  
Sustainable Groundwater Management ◽  
Coastal Cities ◽  
Major Factors ◽  
The City

&lt;p&gt;&amp;#160; &amp;#160; Groundwater is the largest freshwater resource available on Earth, and many coastal regions are depending on groundwater as a primary freshwater source. For example, in Busan and Incheon, two of the largest coastal cities in South Korea, 5.7% and 7.0% of freshwater uses are from groundwater while only 1.8% is from groundwater in Seoul, the capital of the country. Globally, groundwater availability is diminishing primarily by population increase, and especially in coastal regions, this problem is exacerbated by overexploitation and seawater intrusion, which causes groundwater contamination and further reduces its availability. Here, we view the groundwater system and its management for sustainability as a complex problem that is associated with various social, economic, and environmental factors. By adopting the City Blueprint Approach (CBA), which has been used extensively for assessing the sustainability of integrated water management of numerous cities on the globe, we identify water management factors that potentially have direct and indirect links and feedbacks with groundwater variables. We selected Busan and Incheon as case studies for coastal cities that are facing the risk of groundwater salinization by seawater intrusion. This study aims to 1) assess City Blueprint (CB) of selected coastal cities, 2) identify major factors for coastal groundwater management through correlation analysis, and 3) suggest management options regarding identified factors for sustainable groundwater management of the study areas. Our results on CB indicate that the groundwater quality and quantity of the selected cities are currently in &amp;#8216;good&amp;#8217; status. Also, from the correlation analysis, we identified heat risk and freshwater scarcity as the major factors that potentially can affect groundwater quantity. For groundwater quality, the factors of voice and accountability, regulatory quality, and rule of law and control of corruption, most of which had not been explicitly considered for groundwater management, were identified as the major factors. Some of these factors were assessed from &amp;#8216;little concern&amp;#8217; to &amp;#8216;very concern&amp;#8217; for both cities. These results indicate that, regarding the linkages between groundwater variables and other factors in concern, more actions beyond environmental factors should be taken for sustainable groundwater management. This study helps to understand how non-conventional factors could contribute to coastal groundwater, and can provide extensive options for sustainable groundwater management.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Acknowledgement&lt;/strong&gt;: This research was supported by the Development program of Minimizing of Climate Change Impact Technology through the National Research Foundation of Korea (NRF), funded by the Korean government (Ministry of Science and ICT) (NRF-2020M3H5A1080775).&lt;/p&gt;

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