Coastal and submarine karstic discharges in the Gokova Bay, SW Turkey


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Bayari C., Kurttas T.

QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY, cilt.35, ss.381-390, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1144/1470-9236/01034
  • Dergi Adı: QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.381-390
  • Anahtar Kelimeler: fresh water, groundwater contamination, hydrochemistry, remote sensing, water quality
  • Hacettepe Üniversitesi Adresli: Evet

Özet

Hydrochemical, stable isotopic (O-18 and H-2) and thermal infrared data of LANDSAT 5 TM for sea surface temperature anomalies have been used to determine the extent and spatial variation of salinization in coastal and submarine karstic groundwater discharges in the Gokova Bay area, located in the SW Turkey. The bay is an active graben extending in an east-west direction. An artesian aquifer in the eastern tidal plain is the only source of fresh groundwater, whereas Tertiary and Mesozoic carbonates contacting with sea along the northern coastline provide abundant but saline water. Physical properties, major ion chemistry and stable isotope composition indicate a westward increase in the salinity of the karstic springs. The temporal variation of salinity in groundwater is either related to variations in sea level or in seasonal recharge rates, while some springs have time-invariant salinity. Submarine groundwater discharges were determined successfully from satellite images and verified by ground measurements of pH, temperature and electrical conductivity. Some of these discharges are also characterized by the existence of a halocline, as observed during Scuba diving. The westward-increasing salinity appears to be related to decreasing groundwater discharge in this direction.