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Title: Lake sediment study of particulate flux in the Humber catchment using magnetic techniques
Author: Barlow, Daniel
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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At present there is a poor understanding of changes in rates of erosion over long time periods and in the link between erosion and sediment delivery in Britain. Using a catchment study approach sediment accumulation rates in cores from the three lakes Semer Water, Gormire and Hornsea Mere have been used to reconstruct changes in sediment yield over time periods of up to 10,000 years, and estimate the mean annual flux of sediment to the Humber estuary. Each of the sites lies in a catchment of differing land use, relief and geology but taken together they are representative of the Humber catchment. Sediment accumulation in three cores from Semer Water has been used to determine a mean sediment yield of 8 t km-2 a-1 since 1950. Unusually thick sediment sequences were identified upstream of the existing lake Semer Water in the Raydale valley. Resistivity profiles and gouge cores were used to map the extent of these deposits and 14C and pollen analysis used to establish their chronology. The combined sediment mass of Semer Water and Raydale deposits has been calculated at 11 million tonnes. This translates into a mean Holocene sediment yield of 24 t km-2 a-1. The topography of five representative gullies was used to calculate the potential volume of sediment produced from gully erosion in the catchment. This technique indicates that the entire mass of sediment deposited in Raydale during the Holocene may have been produced from gully and channel erosion.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available