NDLI: Sediment dynamics in an upland temperate catchment: changing sediment sources, rates and deposition

Content Provider	Springer Nature Link
Author	Hatfield, Robert G. Maher, Barbara A. Pates, Jacqueline M. Barker, Philip A.
Copyright Year	2008
Abstract	We examine sediment dynamics in an upland, temperate lake system, Lake Bassenthwaite (NW England), in the context of changing climate and land use, using magnetic and physical core properties. Dating and analysis of the sedimentary records of nine recovered cores identify spatially variable sedimentation rates across the deep lake basin. Mineral magnetic techniques, supported by independent geochemical analyses, identify significant variations both in sediment source and flux over the last ∼2100 years. Between ∼100 years BC and ∼1700 AD, sediment fluxes to the lake were low and dominated by material sourced from within the River Derwent sub-catchment (providing 80% of the hydraulic load at the present day). Post-1700 AD, the lake sediments became dominantly sourced from Newlands Beck (presently providing ∼10% of the lake’s hydraulic load). Three successive, major pulses of erosion and increased sediment flux appear linked to specific activities within the catchment, specifically: mining activities and associated deforestation in the mid-late nineteenth century; agricultural intensification in the mid-twentieth century and, within the last decade, the additional possible impact of climate change. These results are important for all upland areas as modifications in climate become progressively superimposed upon the effects of previous and/or ongoing anthropogenic catchment disturbance.
Starting Page	1143
Ending Page	1158
Page Count	16
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	40
Issue Number	4
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-06-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Environmental magnetism Magnetic susceptibility Sediment tracing Lake sediments Land use change Climate change Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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