TY  - JOUR
TI  - Investigation of over-exploited groundwater in Çumra Plain (Konya-Turkey)
with environmental isotopes
AB  - The groundwater in the Çumra plain, a semi-arid climate region, is
intensively exploited for human needs due to especially agricultural and
demographic development. In the study area, there are two main
aquifers which are the semi-confined Neogene aquifer and the
unconfined Quaternary aquifer. This paper presents isotopic
characteristics of groundwater of the over-exploited two aquifer
systems in the Çumra Plain of Konya. δ18O and δD contents of the
Neogene aquifer samples respectively range from -9.89‰ to -6.76‰
and -68.30‰ to -47.50‰ in dry season and range from -10.32‰ to
-7.61‰ and -68.63‰ to -53.11‰ in wet season. δ18O and δD contents
of the Quaternary aquifer samples respectively range from -8.43‰ to
-5.53‰ and -58.67‰ to -45.61‰ in dry season and range from -
8.77‰ to -5.89‰ and -60.18‰ to -46.45‰ in wet season. The δ18O
and δD contents of groundwater samples in two aquifers indicate a
meteoric origin. The average lower Oxygen-18 values of the Neogene
aquifer samples indicate recharge from higher elevations while more
enriched Oxygen-18 values of the Quaternary aquifer samples show
recharged from lower elevation. The groundwater of the Quaternary
aquifer was more affected by the evaporation eventuated during or
after recharge. Besides, positive correlation of δ18O with both Cl and
total dissolved solids (TDS) in the Quaternary aquifer samples reveals
that the evaporation caused salinity increases of the Quaternary aquifer
samples. Tritium contents of the Neogene aquifer samples vary from
0.22 to 2.15TU in dry season and from 0.85 to 2.64TU in wet season,
while tritium contents of the Quaternary aquifer samples vary from 1.18
to 4.37TU and from 1.52 to 5.48TU in dry and wet seasons, respectively.
Accordingly, the samples of the Neogene aquifer reflect relatively higher
residence time. Besides, the Neogene aquifer is under the influence of
relatively recent precipitation, but recent precipitation has contributed
more to the Quaternary aquifer.
AU  - BOZDAĞ, Ayla
DO  - 10.5505/pajes.2021.42272
PY  - 2022
JO  - Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi
VL  - 28
IS  - 3
SN  - 2147-5881
SP  - 483
EP  - 492
DB  - TRDizin
UR  - http://search/yayin/detay/531947
ER  -