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| Titel |
Hydrological dynamics of water sources in a Mediterranean lagoon |
| VerfasserIn |
C. Stumpp, A. Ekdal, I. E. Gönenc, P. Maloszewski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 12 ; Nr. 18, no. 12 (2014-12-05), S.4825-4837 |
| Datensatznummer |
250120543
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| Publikation (Nr.) |
 copernicus.org/hess-18-4825-2014.pdf |
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| Zusammenfassung |
| Lagoons are important ecosystems occupying large coastal areas worldwide.
Lagoons contain various mixtures of marine and freshwater sources which are
highly dynamic in time. However, it often remains a challenge to identify
and quantify dynamic changes of water sources, particularly in heterogeneous
lagoon systems like the Köycegiz–Dalyan lagoon (KDL), which is located
at the south-west of Turkey on the Mediterranean Sea coast. The objective of
this study was to quantify different contributions of potential water
sources i.e. surface water, groundwater and seawater in the lagoon and how
these water sources changed over time and space. In the wet- and dry-season
stable isotopes of water, chloride concentration (Cl-) and salinity
were measured in two depths in the lagoon and surrounding water bodies (sea,
lake, groundwater). Different components of water sources were quantified
with a three component endmember mixing analysis. Differences in Cl-
and stable isotopes over time indicated the dynamic behaviour of the system.
Generally, none of the groundwater samples was impacted by water of the
Mediterranean Sea. During the wet season, most of the lagoon water
(> 95%) was influenced by freshwater and vertically well
mixed. During the dry season, high Cl- in the deeper sampling locations
indicated a high contribution of marine water throughout the entire lagoon
system due to saltwater intrusion. However, a distinct layering in the
lagoon was obvious from low Cl- and depleted isotope contents close to
the surface supporting freshwater inflow into the system even during the dry
season. Besides temporal dynamics also spatial heterogeneities were
identified. Changes in water sources were most evident in the main lagoon
channel compared to more isolate lagoon lakes, which were influenced by
marine water even in the wet season, and compared to side branches
indicating slower turnover times. We found that environmental tracers helped
to quantify highly dynamic and heterogeneous contributions of different
water sources in the Köycegiz–Dalyan lagoon. |
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