Field Methods for Geologists and Hydrogeologists

Assaad, Fakhry A.; LaMoreaux, Philip E.; Hughes, Travis H.

doi:10.1007/978-3-662-05438-3

Cited by 54 publications

(20 citation statements)

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“…The area was studied using the following tools (e.g., Vrba and Zaporozec 1994;Struckmeier and Margat 1995;Assaad et al 2004;Witkowski et al 2007;Chamine´ et al 2013): geological and hydrogeological mapping, hydro-logical techniques and aquifer vulnerability evaluation. Geological fieldwork surveys were first carried out to identify major geologic features responsible for ground-water circulation paths and to assess lithostructural and textural heterogeneities.…”

Section: Methodsmentioning

confidence: 99%

Assessment of groundwater contamination in an agricultural peri-urban area (NW Portugal): an integrated approach

et al. 2014

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The excessive use of pesticides and fertilisers in agriculture has generated a decrease in groundwater and surface water quality in many regions of the EU, consti-tuting a hazard for human health and the environment. Besides, on-site sewage disposal is an important source of groundwater contamination in urban and peri-urban areas. The assessment of groundwater vulnerability to contami-nation is an important tool to fulfil the demands of EU Directives. The purpose of this study is to assess the groundwater vulnerability to contamination related mainly to agricultural activities in a peri-urban area (Vila do Conde, NW Portugal). The hydrogeological framework is characterised mainly by fissured granitic basement and sedimentary cover. Water samples were collected and analysed for temperature, pH, electrical conductivity, chloride, phosphate, nitrate and nitrite. An evaluation of groundwater vulnerability to contamination was applied (GOD-S, Pesticide DRASTIC-Fm, SINTACS and SI) and the potential nitrate contamination risk was assessed, both on a hydrogeological GIS-based mapping. A principal component analysis was performed to characterised pat-terns of relationship among groundwater contamination, vulnerability, and the hydrogeological setting assessed. Levels of nitrate above legislation limits were detected in 75 % of the samples analysed. Alluvia units showed the highest nitrate concentrations and also the highest vulner-ability and risk. Nitrate contamination is a serious problem affecting groundwater, particularly shallow aquifers, especially due to agriculture activities, livestock and cesspools. GIS-based cartography provided an accurate way to improve knowledge on water circulation models and global functioning of local aquifer systems. Finally, this study highlights the adequacy of an integrated approach, combining hydrogeochemical data, vulnerability assessments and multivariate analysis, to understand groundwater processes in peri-urban areas.

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Section: Methodsmentioning

confidence: 99%

Assessment of groundwater contamination in an agricultural peri-urban area (NW Portugal): an integrated approach

et al. 2014

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“…For hydrogeological mapping and the hydrogeotechnical zoning map, surface and underground geological fieldwork were first carried out to map litho-structural heterogeneities and to identify major geostructures responsible for groundwater circulation paths, following the suggestions by [47][48][49][50]. Subsequently, the obtained geodata were integrated including: ground slope, lithology of the vadose zone, soil and aquifer materials, weathering grade, depth to groundwater, net recharge and hydraulic conductivity.…”

Section: Geodata Information Sourcesmentioning

confidence: 99%

Environmental Groundwater Vulnerability Assessment in Urban Water Mines (Porto, NW Portugal)

Afonso

Freitas

Pereira

et al. 2016

Water

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A multidisciplinary approach was developed to estimate urban groundwater vulnerability to contamination combining hydrogeology, hydrogeochemistry, subterranean hydrogeotechnics, groundwater ecotoxicology and isotope tracers. Paranhos and Salgueiros spring waters in Porto City were used as a case study. Historical and current vulnerability scenarios were compared using hydrogeological GIS-based modelling. Potential contamination sources were mapped around the spring galleries. Most of these were point sources and their potential contamination load was moderate. The ecotoxicological assessment indicated a low acute toxicity potential. Groundwater radionuclides appeared to be mainly controlled by geological factors and biomineralisation. Vulnerability maps suggest that most of the area has a moderate to low vulnerability to contamination. However, some surface sources such as sewage systems cause contamination and contribute to increased vulnerability. This integrated approach was demonstrated to be adequate for a better knowledge of urban hydrogeological processes and their dynamics, and highlighted the importance of a vulnerability assessment in urban areas.

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“…Geological maps may be used for a wide range of purposes, such as the identification of groundwater resources and potential geological hazards, the prediction of foundation and slope stability problems, and the selection of locations for agricultural activities (Assaad et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Improving digital tools for Quaternary field survey: a case study of the Rodoretto Valley (NW Italy)

et al. 2011

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Field Methods for Geologists and Hydrogeologists

Cited by 54 publications

References 0 publications

Assessment of groundwater contamination in an agricultural peri-urban area (NW Portugal): an integrated approach

Assessment of groundwater contamination in an agricultural peri-urban area (NW Portugal): an integrated approach

Environmental Groundwater Vulnerability Assessment in Urban Water Mines (Porto, NW Portugal)

Improving digital tools for Quaternary field survey: a case study of the Rodoretto Valley (NW Italy)

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