Recharge and sustainability of a coastal aquifer in northern Albania
2014 (English)In: Hydrogeology Journal, ISSN 1431-2174, E-ISSN 1435-0157, Vol. 22, no 4, 883-892 p.Article in journal (Refereed) Published
The River Mati in Albania has formed a coastal plain with Holocene and Pleistocene sediments. The outer portion of the plain is clay, with three underlying aquifers that are connected to an alluvial fan at the entry of the river into the plain. The aquifers supply water for 240,000 people. Close to the sea the aquifers are brackish. The brackish water is often artesian and found to be thousands of years old. Furthermore, the salinity, supported by delta O-18 results, does not seem to be due to mixing with old seawater but due to diffusion from intercalated clay layers. Heavy metals from mines in the upstream section of River Mati are not an immediate threat, as the pH buffering of the river water is good. Moreover, the heavy metals are predominantly found in suspended and colloidal phases. Two sulphur isotope signatures, one mirroring seawater sulphate in the brackish groundwater (delta S-34 > 21 aEuro degrees) and one showing the influence of sulphide in the river and the fresh groundwater (delta S-34 < 10 aEuro degrees), indicate that the groundwater in the largest well field is recharged from the river. The most serious threat is gravel extraction in the alluvial fan, decreasing the hydraulic head necessary for recharge and causing clogging of sediments.
Place, publisher, year, edition, pages
2014. Vol. 22, no 4, 883-892 p.
Coastal aquifers, Groundwater recharge, Isotopes, Risk assessment, Albania
IdentifiersURN: urn:nbn:se:kth:diva-147029DOI: 10.1007/s10040-014-1097-1ISI: 000336269500010ScopusID: 2-s2.0-84901290230OAI: oai:DiVA.org:kth-147029DiVA: diva2:728557
FunderSwedish Environmental Protection Agency
QC 201406242014-06-242014-06-232014-06-24Bibliographically approved