DOI: 10.5194/hess-21-1669-2017
Scopus记录号: 2-s2.0-85016150834
论文题名: Identification of dominant hydrogeochemical processes for groundwaters in the Algerian Sahara supported by inverse modeling of chemical and isotopic data
作者: Slimani R ; , Guendouz A ; , Trolard F ; , Souffi Moulla A ; , Hamdi-Aïssa B ; , Bourrié G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 3 起始页码: 1669
结束页码: 1691
语种: 英语
Scopus关键词: Aquifers
; Calcite
; Carbon
; Dissolution
; Groundwater
; Hydrogeology
; Inverse problems
; Ion exchange
; Isotopes
; Salts
; Calcite precipitation
; Geochemical process
; Geological formation
; Hydrochemical data
; Hydrogeochemical process
; Ion exchange process
; Secondary precipitations
; Specific interaction
; Hydrochemistry
; aquifer
; biomineralization
; carbon sink
; chemical analysis
; dissolution
; groundwater
; hydrogeochemistry
; hydrological modeling
; identification method
; ion exchange
; isotopic composition
; phreatic zone
; quantitative analysis
; rainwater
; Algeria
; Sahara
英文摘要: Unpublished chemical and isotopic data taken in November 1992 from the three major Saharan aquifers, namely the Continental Intercalaire (CI), the Complexe Terminal (CT) and the phreatic aquifer (Phr), were integrated with original samples in order to chemically and isotopically characterize the largest Saharan aquifer system and investigate the processes through which groundwaters acquire their mineralization. Instead of classical Debye–Hückel extended law, a specific interaction theory (SIT) model, recently incorporated in PHREEQC 3.0, was used. Inverse modeling of hydrochemical data constrained by isotopic data was used here to quantitatively assess the influence of geochemical processes: at depth, the dissolution of salts from the geological formations during upward leakage without evaporation explains the transitions from CI to CT and to a first end member, a cluster of Phr (cluster I); near the surface, the dissolution of salts from sabkhas by rainwater explains another cluster of Phr (cluster II). In every case, secondary precipitation of calcite occurs during dissolution. All Phr waters result from the mixing of these two clusters together with calcite precipitation and ion exchange processes. These processes are quantitatively assessed by the PHREEQC model. Globally, gypsum dissolution and calcite precipitation were found to act as a carbon sink. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79217
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Ouargla University, Fac. des Sciences de la Nature et de la Vie, Lab. Biochimie des Milieux Désertiques, Ouargla, Algeria; Blida University, Science and Engineering Faculty, P.O. Box 270 Soumaâ, Blida, Algeria; INRA - UMR1114 EMMAH, Avignon, France; Algiers Nuclear Research Centre, P.O. Box 399, Alger-RP, Algiers, Algeria
Recommended Citation:
Slimani R,, Guendouz A,, Trolard F,et al. Identification of dominant hydrogeochemical processes for groundwaters in the Algerian Sahara supported by inverse modeling of chemical and isotopic data[J]. Hydrology and Earth System Sciences,2017-01-01,21(3)