Groundwater residence time in basement aquifers of the Ochi-Narkwa Basin in the Central Region of Ghana

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00321333" target="_blank" >RIV/68407700:21110/17:00321333 - isvavai.cz</a>

Alternative codes found

RIV/60460709:41330/17:74732

Result on the web

<a href="http://dx.doi.org/10.1016/j.jafrearsci.2017.07.028" target="_blank" >http://dx.doi.org/10.1016/j.jafrearsci.2017.07.028</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jafrearsci.2017.07.028" target="_blank" >10.1016/j.jafrearsci.2017.07.028</a>

Result language

angličtina

Original language name

Groundwater residence time in basement aquifers of the Ochi-Narkwa Basin in the Central Region of Ghana

Original language description

Groundwaters from basement aquifers in the Ochi-Narkwa basin of the Central Region together with rain and surface waters have been analysed for stable isotopes (d18O, d2H and d13C) and radioisotopes (3H and 14C) to determine sources of recharge, groundwater residence time and flow path. The mechanism of recharge to the groundwaters is by direct infiltration of past local rainfall of mean isotopic composition d18O1/43.8permilleV-SMOW and d2H1/418permilleV-SMOW. Tritium in the groundwaters ranged from 0.05 ± 0.07 to 4.75 ± 0.16 TU. Tritium data revealed that 85% of the groundwater samples were of modern recharge or young waters. The 14C content of the groundwaters ranged between 9.50 pMC in borehole CR2-50 at Ekumfi Asokwa to 113.56 pMC in borehole CR3-26 at Onyaadze. Evaluation of 3H and 14C data distinguished three groups of water namely (1) waters characterised by high 3H and high 14C depicting modern recharge, (2) waters showing a mixture of young and old water due to fractures and (3) waters showing low 3H and low 14C contents referred to as very old waters and include borehole CR2-50 at Ekumfi Asokwa. The estimated age or residence time of this older water is 19,459 years BP based on uncorrected age. The major flow direction is northwest-southeast. The dominant months contributing to recharge in the study area were February, March, April, May, June, August, September and October. Groundwater residence times in the basement aquifers of the Ochi-Narkwa basin showed that groundwater abstraction is sustainable and requires that the recharge areas are protected from contamination.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10501 - Hydrology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of African Earth Sciences

ISSN

1464-343X

e-ISSN

1879-1956

Volume of the periodical

134

Issue of the periodical within the volume

N/A

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

590-599

UT code for WoS article

000412609000050

EID of the result in the Scopus database

2-s2.0-85026725879