Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco
Autor: | Mohammed Bahir, Paula M. Carreira, Driss Ouazar, Otman El Mountassir, Abdelghani Chehbouni |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Technology
Soil salinity Global meteoric water line General Chemical Engineering Science Geochemistry General Physics and Astronomy Aquifer 010501 environmental sciences 010502 geochemistry & geophysics 01 natural sciences Farm water Climate change General Materials Science Precipitation Groundwater 0105 earth and related environmental sciences General Environmental Science Stable isotopes geography geography.geographical_feature_category General Engineering Groundwater recharge General Earth and Planetary Sciences Environmental isotopes Environmental science Essaouira |
Zdroj: | SN Applied Sciences, Vol 3, Iss 7, Pp 1-16 (2021) |
ISSN: | 2523-3971 2523-3963 |
Popis: | The city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region. |
Databáze: | OpenAIRE |
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