Groundwater geochemistry of a small reservoir catchment in Central Tunisia |
| |
| Institution: | 1. Institut de Recherche pour le Développement, 32 Avenue Henri Varagnat, 93143 Bondy, France;2. INRGREF, Rue Hédi Karray, BP 10, 2080 Ariana, Tunisia;1. PPGeo, Instituto de Geociências, Universidade Federal da Bahia, Salvador, BA, Brazil;2. Departamento de Ciências Agrárias e Ambientais, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brazil;1. Departamento de Química Fundamental, Universidade Federal de Pernambuco (UFPE), Cidade Universitária, 50740-560, Recife, PE, Brazil;2. Laboratório de Imunopatologia Keizo‐Asami, Universidade Federal de Pernambuco (UFPE), Cidade Universitária, 50670-901, Recife, PE, Brazil;3. Programa de Pós-Graduação em Biotecnologia, Universidade Potiguar (UnP), Campus Salgado Filho, 59075-000, Natal, RN, Brazil;4. Departamento de Microbiologia, Instituto Aggeu Magalhães (IAM-FIOCRUZ), Av. Professor Moraes Rego s/n, 50670-420, Recife, Brazil;5. Departamento de Bioquímica, Universidade Federal de Pernambuco, Cidade Universitária, 50670-901, Recife, PE, Brazil;1. Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, United States;2. US EPA, Office of Research and Development, National Exposure Research Laboratory, Research Triangle Park, NC, USA;3. US EPA, Office of Research and Development, National Risk Management Research Laboratory, Research Triangle Park, NC, USA;4. US EPA, Office of Air and Radiation, Office of Transportation and Air Quality, National Vehicle and Fuel Emissions Laboratory, Ann Arbor, MI, USA;1. Department of Physics, Moolji Jaitha College, Jalgaon 425 001, Maharashtra, India;2. Department of Physics, North Maharashtra University, Jalgaon 425 001, Maharashtra, India;3. Center for Materials Characterization, National Chemical Laboratory, Pune 411 008, Maharashtra, India;1. Universidad Nacional Autónoma de México, Departamento de Recursos Naturales, Instituto de Geofísica, Ciudad Universitaria, No. 3000, Col. Copilco Universidad, Delegación Coyoacán, 04360, CDMX, Mexico;2. Earth Sciences Student, México, Benemérita Universidad Autónoma de México, Ciudad Universitaria: Edificio Central, Cd Universitaria, 72000, Puebla, Pue, Mexico;3. Earth Sciences Student, México, Instituto Politécnico Nacional, Calz. Ticomán 600, San José Ticoman, Gustavo A. Madero, 07340, Ciudad de México, CDMX, Mexico |
| |
| Abstract: | Due to the scarcity of water resources in semiarid sedimentary basins, hill reservoirs are often constructed to recharge groundwater and limit runoff induced water loss. The impact of such reservoirs on groundwater chemistry is investigated in the aquifers of the El Gouazine watershed, Central Tunisia. Three groundwater types are recognised, Ca–HCO3, Na–Cl and Ca–SO4. The strong similarity between host rock and groundwater chemistries indicates significant rock–water interaction. A flowpath, along which the chemical composition of the groundwater evolves, can be identified using the contrast in stable isotope signature between upstream and downstream groundwater. Shallow upstream groundwater is recharged by the infiltration of rainwater with the rate of recharge strongly linked to the permeability of the host lithology. Calcium and HCO3 are supplied to an alluvial aquifer from a more rapidly recharged limestone aquifer with the concentration of Ca and HCO3 ions decreasing by dilution. The alluvial aquifer is also enriched in Ca and SO4 during the downstream flow of groundwater through gypsiferous materials. There is evidence of mixing between meteoric groundwater and evaporated reservoir water. Below the reservoir and partly responsible for reservoir leakage is a sandy aquifer, formed by weathering and erosion of a sandstone host which also supplies water to the alluvial aquifer. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
