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Author |
Krige*, D.G. |
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Title |
A statistical approach to some basic mine valuation problems on the Witwatersrand |
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Journal Article |
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Year |
1951 |
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Jour. Chem. Metall. and Mining Soc. So. Africa |
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52 (6) |
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119-139 |
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0038-223x |
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CUT @ phaedon.kyriakidis @ Krige1951 |
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157 |
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Author |
Hammami Abidi, J.; Farhat, B.; Ben Mammou, A.; Oueslati, N. |
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Title |
Characterization of Recharge Mechanisms and Sources of Groundwater Salinization in Ras Jbel Coastal Aquifer (Northeast Tunisia) Using Hydrogeochemical Tools, Environmental Isotopes, GIS, and Statistics |
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Journal Article |
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Year |
2017 |
Publication |
Journal of Chemistry |
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2017 |
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8610894 |
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Groundwater is among the most available water resources in Tunisia; it is a vital natural resource in arid and semiarid regions. Located in north-eastern Tunisia, the Metline-Ras Jbel-Raf Raf aquifer is a mio-plio-quaternary shallow coastal aquifer, where groundwater is the most important source of water supply. The major ion hydrochemistry and environmental isotope composition δ18O, δ2H were investigated to identify the recharge sources and processes that affect the groundwater salinization. The combination of hydrogeochemical, isotopic, statistical, and GIS approaches demonstrates that the salinity and the groundwater composition are largely controlled by the water-rock interaction particularly the dissolution of evaporate minerals and the ion exchange process, the return flow of the irrigation water, agricultural fertilizers, and finally saltwater intrusion which started before 1980 and which is partially mitigated by the artificial recharge since 1993. As for the stable isotope signatures, results showed that groundwater samples lay on and around the local meteoric water line LMWL; hence, this arrangement signifies that the recharge of the Ras Jbel aquifer is ensured by recent recharge from Mediterranean air masses. |
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Hindawi KW |
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2090-9063 |
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THL @ christoph.kuells @ |
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189 |
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Author |
Edwards, P.J.; Williard, K.W.J.; Schoonover, J.E. |
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Title |
Fundamentals of watershed hydrology |
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Journal Article |
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Year |
2015 |
Publication |
Journal of contemporary water research & education |
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154 |
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1 |
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3-20 |
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Wiley Online Library |
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THL @ luqianxue.zhang @ edwards2015fundamentals |
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101 |
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Kumar, A.R.; Riyazuddin, P. |
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Title |
Speciation of selenium in groundwater: Seasonal variations and redox transformations |
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Year |
2011 |
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Journal of hazardous materials |
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192 |
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1 |
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263-269 |
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Elsevier |
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THL @ luqianxue.zhang @ kumar2011speciation |
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67 |
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Author |
Han, D.; Post, V.E.A.; Song, X. |
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Title |
Groundwater salinization processes and reversibility of seawater intrusion in coastal carbonate aquifers |
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Journal Article |
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2015 |
Publication |
Journal of Hydrology |
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531 |
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1067-1080 |
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Seawater intrusion (SWI) has led to salinization of fresh groundwater reserves in coastal areas worldwide and has forced the closure of water supply wells. There is a paucity of well-documented studies that report on the reversal of SWI after the closure of a well field. This study presents data from the coastal carbonate aquifer in northeast China, where large-scale extraction has ceased since 2001 after salinization of the main well field. The physical flow and concomitant hydrogeochemical processes were investigated by analyzing water level and geochemical data, including major ion chemistry and stable water isotope data. Seasonal water table and salinity fluctuations, as well as changes of δ2H–δ18O values of groundwater between the wet and dry season, suggest local meteoric recharge with a pronounced seasonal regime. Historical monitoring testifies of the reversibility of SWI in the carbonate aquifer, as evidenced by a decrease of the Cl− concentrations in groundwater following restrictions on groundwater abstraction. This is attributed to the rapid flushing in this system where flow occurs preferentially along karst conduits, fractures and fault zones. The partially positive correlation between δ18O values and TDS concentrations of groundwater, as well as high NO3− concentrations (\textgreater39mg/L), suggest that irrigation return flow is a significant recharge component. Therefore, the present-day elevated salinities are more likely due to agricultural activities rather than SWI. Nevertheless, seawater mixing with fresh groundwater cannot be ruled out in particular where formerly intruded seawater may still reside in immobile zones of the carbonate aquifer. The massive expansion of fish farming in seawater ponds in the coastal zone poses a new risk of salinization. Cation exchange, carbonate dissolution, and fertilizer application are the dominant processes further modifying the groundwater composition, which is investigated quantitatively using hydrogeochemical models. |
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Elsevier |
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0022-1694 |
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THL @ christoph.kuells @ Han2015 |
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24 |
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