Anthropic influences on the sedimentation rates of lakes situated in different geographic areas

Publication date: July 2017
Source:Journal of Environmental Radioactivity, Volume 173
Author(s): Hedvig Simon, Szabolcs Kelemen, Róbert-Csaba Begy
The aim of this study is to determine the effects of natural and anthropic events occurring in the last 30 years in the catchment areas of four Romanian lakes (St. Anna Lake, Red Lake, Vârşolţ Lake and Matiţa Lake) originating from four different geomorphologic areas. A total of eleven sediment cores have been processed for age and sedimentation rate determination using the ²¹⁰Pb dating method. Total ²¹⁰Pb was measured via alpha spectrometry by ²¹⁰Po using PIPS detectors, while supported ²¹⁰Pb was measured by ²²⁶Ra using HPGe detectors. Ages and sedimentation rates were calculated using the CRS model. The values of the sedimentation rates have grown multiply in the last three decades: 2.66 times in case of the St. Anna Lake (from 0.06 ± 0.01 g/cm²y to 0.16 ± 0.02 g/cm²y), up to 6.72 times in case of Red Lake (0.36 ± 0.04 g/cm²y to 2.42 ± 0.36 g/cm²y), 4.02 times in case of Vârşolţ Lake (04 g/cm²y to 1.53 ± 0.18 g/cm²y) and up to 16.18 times in case of Matiţa Lake (0.27 ± 0.03 g/cm²y to 4.37 ± 0.32).



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