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| Titel |
Characterization of Surface Water and Groundwater Quality in the Lower Tano River Basin Using Statistical and Isotopic Approach. |
| VerfasserIn |
Adwoba Edjah, Barbara Stenni, Giulio Cozzi, Clara Turetta, Giuliano Dreossi, Thomas Tetteh Akiti, Sandow Yidana |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137663
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| Publikation (Nr.) |
 EGU/EGU2017-447.pdf |
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| Zusammenfassung |
| Adwoba Kua- Manza Edjaha, Barbara Stennib,c,Giuliano Dreossib, Giulio Cozzic,
Clara Turetta c,T.T Akitid ,Sandow Yidanae
a,eDepartment of Earth Science, University of Ghana Legon, Ghana West Africa
bDepartment of Enviromental Sciences, Informatics and Statistics, Ca Foscari
University of Venice, Italy
cInstitute for the Dynamics of Environmental Processes, CNR, Venice, Italy
dDepartment of Nuclear Application and Techniques, Graduate School of Nuclear
and Allied Sciences University of Ghana Legon
This research is part of a PhD research work “Hydrogeological Assessment of the Lower
Tano river basin for sustainable economic usage, Ghana, West - Africa”. In this study, the
researcher investigated surface water and groundwater quality in the Lower Tano river basin.
This assessment was based on some selected sampling sites associated with mining activities,
and the development of oil and gas. Statistical approach was applied to characterize
the quality of surface water and groundwater. Also, water stable isotopes, which
is a natural tracer of the hydrological cycle was used to investigate the origin of
groundwater recharge in the basin. The study revealed that Pb and Ni values of the surface
water and groundwater samples exceeded the WHO standards for drinking water. In
addition, water quality index (WQI), based on physicochemical parameters(EC,
TDS, pH) and major ions(Ca2+, Na+, Mg2+, HCO3−,NO3−, CL−, SO42−, K+)
exhibited good quality water for 60% of the sampled surface water and groundwater.
Other statistical techniques, such as Heavy metal pollution index (HPI), degree
of contamination (Cd), and heavy metal evaluation index (HEI), based on trace
element parameters in the water samples, reveal that 90% of the surface water and
groundwater samples belong to high level of pollution. Principal component analysis
(PCA) also suggests that the water quality in the basin is likely affected by rock
– water interaction and anthropogenic activities (sea water intrusion). This was
confirm by further statistical analysis (cluster analysis and correlation matrix) of the
water quality parameters. Spatial distribution of water quality parameters, trace
elements and the results obtained from the statistical analysis was determined by
geographical information system (GIS). In addition, the isotopic analysis of the
sampled surface water and groundwater revealed that most of the surface water
and groundwater were of meteoric origin with little or no isotopic variations. It is
expected that outcomes of this research will form a baseline for making appropriate
decision on water quality management by decision makers in the Lower Tano river
Basin.
Keywords: Water stable isotopes, Trace elements, Multivariate statistics, Evaluation
indices, Lower Tano river basin. |
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