NDLI: Weathering, Biomass Production and Groundwater Chemistry in an Area of Dominant Anthropogenic Influence, the Chaves-Vila Pouca de Aguiar Region, North of Portugal

Content Provider	Springer Nature Link
Author	Pacheco, F. A. L. Sousa Oliveira, A. Van der Weijden, A. J. Van der Weijden, C. H.
Copyright Year	1999
Abstract	Using a combination of a grouping algorithm and a geochemical mole balance algorithm, we could identify and quantify the contributions made by water-rock and water-biomass interactions to the composition of shallow groundwaters in northern Portugal, in an area with a sizable anthropogenic input (the Chaves-Vila Pouca de Aguiar region). The first algorithm, based on the mathematical concept of equivalent relations, allows for the grouping of water samples with similar chemistries. The second algorithm, which uses the stoichiometries and mole/charge balances in weathering reactions and biological processes, provides the possibility to relate the average chemistry of each identified group to water-mineral and water-biomass interactions. This algorithm hinges on ratios of dissolved silica and bicarbonate, constituents considered to be derived only from chemical weathering and biomass production. Background information on the petrology, mineralogy and chemistry of bedrocks and soils, on climatic differences, on the history of deforestation and reforestation of the study area, and on the application and composition of fertilizers and manure, was used to identify the most realistic weathering reactions and biological processes which contribute to the water chemistry. The concentrations of chloride, sulphate and nitrate were considered to represent sources other than chemical weathering or biomass changes, like cyclic salts, fertilizers and manure. Despite the high background concentrations derived from such sources, we were able to quantify the contributions of the identified weathering reactions and botanical uptake to the groundwater composition. The spatial distributions of the various groundwater groups shows a good correlation with the geology, land use and climatic differences in the area.
Starting Page	481
Ending Page	512
Page Count	32
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	115
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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