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Chemistry of sediments from two linked lakes in North Wales
Author(s) -
GUPPY SUSAN F.,
HAPPEYWOOD CHRISTINE M.
Publication year - 1978
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1978.tb01463.x
Subject(s) - sediment , erosion , deposition (geology) , geology , streams , hydrology (agriculture) , geomorphology , computer network , geotechnical engineering , computer science
SUMMARY. Cores of sediment from Llyn Peris and Llyn Padarn, two linked lakes in North Wales, are described. Dating of sediments by 14 C techniques, investigations of remanent geomagnetism and estimates of recent deposition rates from measurements of 137 Cs, indicate that in Padarn an unbroken record of the last 7000 years has been obtained. In Peris, the upper lake, the rate of sediment accumulation is greater than in Padarn and the sediment has been considerably disturbed. Sediment chemistry is related to the climatic and industrial history of the area. Some features of the chemical profiles in Padarn are similar to those of lakes in the English Lake District, and there is evidence to suggest that erosion has increased in the catchment since c . 3500 years ago. This is more recent than similar increases in erosion reported for the English Lake District. In Peris, industrial activity during the past few hundred years has resulted in high levels of copper and calcium in the surface regions of sediment profiles.