INVESTIGATION OF GÜLLÜK (MUĞLA) WETLAND USING STABLE ISOTOPES (δ18O, δD)

Yıl 2017, Cilt: 154 Sayı: 154, 181 - 191, 04.04.2017

Melis A. Somay

https://doi.org/10.19111/bulletinofmre.298595

Öz

Wetlands play an important role
in the hydrologic cycle. This investigation was completed to determine the
origin of waters and recharge-discharge areas using stable isotopes (δ18O and
δD) which are fingerprints of the water in Güllük (Muğla) wetland. This area is
important both economically and in terms of aquaculture environment in Turkey.
Sample locations were selected from not only wetlands but also the possible
recharge area that consists of karstic springs and streams. EC (Electrical
Conductivity) of the waters range between 5080-41000 µS/cm, except streams. δ18O
and δD contents of the samples ranged from -6.00‰ to 0.50‰ and from
-29.1‰ to 2.1‰, respectively. In general, samples plotted between Global and
Local Meteoric Water line with waters also plotted on the seawater mixing line.
The sources of salinity were evaluated by δ18O-Cl in and around the
wetland. Streams are under the influence of “Evaporation”; samples from Avşar
and Koruköy are under the influence of “Both Evaporation and Seawater Mixing”;
İçme and Ekinambarı springs, and Limni Lake are under the influence of
“Seawater Mixing”; and Savran spring and Tuzla Lake are under the influence of
“Dissolution of Salts-Leaching” processes. The fact that Savran source plotted
in this area raises the question of whether the current sea water is the source
of salinity. The recharge area of the wetland consists of karstic formations,
sea water, streams and precipitation in the Güllük area.

Anahtar Kelimeler

Güllük, Wetland, Stable Isotope, Salt water intrusion, hydrogeology

Kaynakça

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