Akademik Veri Yönetim Sistemi
COMU J. Mar. Sci. Fish, cilt.4, sa.2, ss.159-167, 2021 (Hakemli Dergi)
Sediment dredging (removal), a lake management method, is performed on a regular basis to improve
the recreational value of Mogan Lake. The aim of the study is to a) determine heavy metal concentrations (Hg,
As, Cd, Cr, Pb, Ni, Cu, and Zn) in the sediment after dredging and make evaluations based on the sediment
quality criteria, b) define the potential sources of heavy metals by multivariate analyses, c) shed light on the
effectiveness of the dredging in the context of current data. As indicated by the findings from two stations
under the influence of mineral processing facilities (station I) and domestic wastewater discharges (station II)
taken in May and November, 2020, the mean heavy metal concentrations in the sediment in decreasing order
were Cr>Cu>Zn>Ni>Pb>As>Cd>Hg. Cr, Ni, and As levels were found to exceed the probable effect level
(PEL) and therefore, the lake sediment was classified as heavily polluted in terms of Cr, Ni, Cu and As. Based
on the Spearman’s correlation analysis, Cu-Cd, Zn-Pb, and As-Cd were found to have similar anthropogenic
sources. Three main components determined by the principal component analysis also support this result; the
differences in heavy metals originating from different anthropogenic sources reflect the environmental pollution
diversity and pressure related to the heavy metal accumulation in the lake sediment. Based on our findings,
sediment removal in Mogan lake can not be considered as effective intervention. As anthropogenic pollutants
persist in the lake basin, sediment should be routinely monitored for heavy metal levels to ensure the lake's
sustainable use.