Universität zu Köln

Ardali, Ayca Sultan, Tezkan, Buelent and Gurer, Aysan ORCID: 0000-0001-5731-5917 (2018). On the Salt Water Intrusion into the Durusu Lake, Istanbul: A Joint Central Loop TEM And Multi-Electrode ERT Field Survey. Pure Appl. Geophys., 175 (8). S. 3037 - 3051. BASEL: SPRINGER BASEL AG. ISSN 1420-9136

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Abstract

Durusu Lake is the biggest and most important freshwater source supplying drinking water to the European side of Istanbul. In this study, electrical resistivity tomography (ERT) and transient electromagnetic (TEM) measurements were applied to detect a possible salt water intrusion into the lake and to delineate the subsurface structure in the north of Durusu Lake. The ERT and TEM measurements were carried out along six parallel profiles extending from the sea coast to the lake shore on the dune barrier. TEM data were interpreted using different 1-D inversion methods such as Occam, Marquardt, and laterally constrained inversion (LCI). ERT data were interpreted using 2-D inversion techniques. The inversion results of ERT and TEM data were shown as resistivity depth sections including topography. The sand layer spreading over the basin has a resistivity of 150-400 Omega m with a thickness of 5-10 m. The sandy layer with clay, silt, and gravel has a resistivity of 15-100 Omega m and a thickness of 10-40 m followed by a clay layer of a resistivity below 10 Omega m. When the inversion of these data is interpreted along with the hydrogeology of the area, it is concluded that the salt water intrusion along the dune barrier is not common and occurs at a particular area where the distance between lake and sea is very close. Using information from boreholes around the lake, it was verified that the common conductive region at depths of 30 m or more consists of clay layers and clay lenses.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ardali, Ayca Sultan UNSPECIFIED UNSPECIFIED UNSPECIFIED Tezkan, Buelent UNSPECIFIED UNSPECIFIED UNSPECIFIED Gurer, Aysan UNSPECIFIED orcid.org/0000-0001-5731-5917 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-178363
DOI:	10.1007/s00024-018-1813-1
Journal or Publication Title:	Pure Appl. Geophys.
Volume:	175
Number:	8
Page Range:	S. 3037 - 3051
Date:	2018
Publisher:	SPRINGER BASEL AG
Place of Publication:	BASEL
ISSN:	1420-9136
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOMAIN ELECTROMAGNETIC METHOD; SEAWATER INTRUSION; ELECTRICAL-RESISTIVITY; CONSTRAINED INVERSION; SALINE GROUNDWATER; AQUIFER; ISRAEL; INTERFACE; SALTWATER; SHORE Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17836