Dynamics and a Hydraulic-Soil Mechanical Model for Pockmarks in a Mud-draped Lake : Lake Sünnet (NW Anatolia)
Ocakoğlu, Faruk (Eskisehir Osmangazi University. Department of Geological Engineering)
Topçu, Sadettin (Kütahya Dumlupınar University. Kütahya Vocational School of Technical)
Açıkalın, Sanem (Newcastle University. Department of Civil Engineering and Geosciences)
Erayık, Celal (Meridyen Yerbilimleri Madencilik Enerji San. Tic. (Eskiüehir, Turquia))
Kır, Osman (Cankır İnşaat (Ankara, Turquia))

Date:	2023
Abstract:	The scarcity of bathymetric studies in most Turkish lakes does not allow the documentation and the potential causes of lake bottom irregularities. In this study, relatively high-resolution bathymetric data from Lake Sünnet (NW Anatolia) revealed five deep (5. 7 to 9. 2m) and narrow (10 to 20m) depressions located along the boundary between the lake bottom and the steep lake margins. Analysis of lake level data belonging to dry seasons hints no leakage through these depressions. However, the negative conical shape and weakly developed levees around the holes suggest an upward episodic groundwater discharge for which direct evidence has been absent up to date. A combined hydraulic and soil mechanical model successfully explains the pockmark activity due to the flow of water through conduits in karstic carbonate bedrock. According to sedimentation rates and average depth of pockmarks in Lake Sünnet, and available regional paleoclimate studies, the onset of pockmark activity might coincide with the transition from the Near East Aridification Phase to the humid Beyşehir Occupation Phase around 300 BCE in SW and NW Anatolia.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Groundwater discharge ; Hydraulic modelling ; Inland lake ; Karstic conduits ; Pockmarks
Published in:	Geologica acta, Vol. 21 (2023) , p. 1-11, I-II (Articles) , ISSN 1696-5728

Adreça original: https://raco.cat/index.php/GeologicaActa/article/view/422936
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/42753
DOI: 10.1344/GeologicaActa2023.21.11

13 p, 20.4 MB

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