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Title: Wind control on the accumulation of heavy metals in sediment of Lake Ulubat, Anatolia, Turkey
Authors: Kazancı, N
Leroy, SAG
Öncel, S
Ileri, O
Toprak, O
Costa, PJM
Sayılı, S
Turgut, C
Kibar, M
Keywords: Lake Ulubat;Heavy metal;Wind effect;Holocene;Turkey
Issue Date: 2009
Publisher: Springer Verlag
Citation: Journal of Paleolimnology 43(1): 89-110
Abstract: Freshwater Lake Ulubat (zmean = 1.5-2.0 m and Area = ~138 km2), NW Anatolia, Turkey was filled in by fine-to-medium-grain silts during the late Holocene. Deposition in Lake Ulubat has been 1.6 cm yr-1 for the last 50 years, but the sedimentation rate over the last ~1,600 years was lower (0.37 mm yr-1). The organic matter and carbonate contents of the infill show cyclic changes that reflect environmental fluctuations. The silt-dominated lithology and the vertically uniform heavy metal distributions are probably due to wind-controlled sedimentation in the lake. Heterogeneous mud, derived from a large, mountainous drainage basin, is deposited in the lake mostly during summer, June to October, when conditions are hot and calm. Winter months are stormier and sediments are re-suspended due to the shallow water depth and the effect of waves on the lake bottom. It is likely that re-suspended sediments, particularly fine-grained particles, together with the heavy metals, are transported out of the lake via the outlet, especially during periods of high lake level. This resuspension and removal process probably caused the lake sediments to become silt-dominated and depleted in heavy metals. The role of broad shallow lakes in sequestering sediments and heavy metals can be described more accurately when wind data are considered. Such information may also be helpful for land-use planning in downstream areas.
ISSN: 0921-2728
Appears in Collections:Environment
Institute for the Environment

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