FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W189806525> ?p ?o ?g. }

• W189806525 abstract "To comply with the European Union Water Framework Directive (2000), National Governments are required to achieve good chemical and ecological status of freshwater bodies. Fine sediment has been shown to be a major cause of the degradation of lakes and rivers, and as a result research in geomorphology has been directed towards the understanding of fine sediment dynamics. It was identified by a review of published literature that at present a paucity of information on sediment dynamics existed for the East Midlands, UK. The use of tracers within a sediment fingerprinting framework has recently become a heavily used technique to investigate the sources of fine sediment pressures. However, uncertainties associated with tracer behaviour have been cited as major potential limitations to sediment fingerprinting methodologies. At present few studies have quantified the uncertainties associated with tracer use, or the exact reasons why different tracers are producing different sediment provenance results. This thesis had two aims based on these gaps in published literature. First, to assess the impact of sediment sampling methodology, tracer selection, particle size corrections and organic enrichment corrections on a fine sediment fingerprinting study. Secondly, to develop a partial sediment budget for the Upper Nene river basin and its major tributaries. The results of this thesis were presented in two parts. The first part investigated Aim 1 when fingerprinting; historically deposited sediment, suspended sediment and recently deposited sediment. The second part investigated Aim 2 by constructing a fine sediment budget for the Nene river basin, consisting of; sediment yield, sediment provenance, floodplain sediment accumulation and channel bed sediment storage. A mean difference of 24.1% between the predicted contributions of sediment originating from channel banks was found when using nine different tracer groups to fingerprint the river sediment samples. When fingerprinting contributions from urban street dusts mean differences between tracer group predictions were lower, at between 8% and 11%. There was little indication that organic matter content and / or particle size caused differences between tracer group predictions. Within-source variability in tracer concentrations, and small contrasts between the tracer concentrations of the sediment source groups, were identified as probable causes of inherent uncertainty present in the fingerprinting analysis. It was determined that the ratio of the percentage difference between median tracer concentrations in the source groups and the average within-source tracer concentration coefficient of variation could indicate the likely uncertainty in model predictions prior to tracer use. When fingerprinting historically deposited sediment, a reservoir core was fingerprinted with the least uncertainty, with tracer group provenance predictions ~28% apart and with consistent down-core trends. When fingerprinting an on-line lake core and four floodplain cores, differences between tracer group predictions were as large as 100%; the down-core trends in changing sediment provenance were also different. The differences between tracer group predictions could be attributed to the organic matter content and particle size of the sediment. There was also evidence of the in-growth of bacterially derived magnetite and chemical dissolution affecting the preservation of tracer signatures. Despite the prior indications that organic matter and particle size were causing tracer non-conservatism in historical sediment cores, data corrections were found to often be ineffective at reducing the differences between tracer group predictions. The corrections were found to either have no effect on, or increase the mean differences between, tracer group predictions when fingerprinting river sediment. The sediment budget identified that the annual sediment yield of 13 - 19 t km-2 yr-1 for the Nene is low in comparison to other UK catchments. Channel banks were found to be the dominant sediment source in the Nene, typically contributing between 60% and 100% of the sediment. Rates of sediment accumulation on the Nene’s floodplain was found to be highly variable (920– 7,200 t km-2 yr-1); the presence of flood defences were likely to be a cause of this variability, and have caused a reduction in the accumulation rate since 1963. It was found that large quantities of sediment accumulated on channel beds during periods of low flows (~ 28% of the annual sediment yield), which was flushed from the bed by a series of flood events (leaving" @default.
• W189806525 created "2016-06-24" @default.
• W189806525 creator A5082862903 @default.
• W189806525 date "2014-01-01" @default.
• W189806525 modified "2023-09-27" @default.
• W189806525 title "Exploring fine sediment dynamics and the uncertainties associated with sediment fingerprinting in the Nene river basin, UK" @default.
• W189806525 hasPublicationYear "2014" @default.
• W189806525 type Work @default.
• W189806525 sameAs 189806525 @default.
• W189806525 citedByCount "0" @default.
• W189806525 crossrefType "dissertation" @default.
• W189806525 hasAuthorship W189806525A5082862903 @default.
• W189806525 hasConcept C109007969 @default.
• W189806525 hasConcept C114793014 @default.
• W189806525 hasConcept C126645576 @default.
• W189806525 hasConcept C127313418 @default.
• W189806525 hasConcept C155681218 @default.
• W189806525 hasConcept C166390339 @default.
• W189806525 hasConcept C16828302 @default.
• W189806525 hasConcept C17409809 @default.
• W189806525 hasConcept C187320778 @default.
• W189806525 hasConcept C18903297 @default.
• W189806525 hasConcept C205649164 @default.
• W189806525 hasConcept C2777610350 @default.
• W189806525 hasConcept C2780049196 @default.
• W189806525 hasConcept C2780797713 @default.
• W189806525 hasConcept C2816523 @default.
• W189806525 hasConcept C39432304 @default.
• W189806525 hasConcept C58640448 @default.
• W189806525 hasConcept C65589250 @default.
• W189806525 hasConcept C76886044 @default.
• W189806525 hasConcept C86803240 @default.
• W189806525 hasConceptScore W189806525C109007969 @default.
• W189806525 hasConceptScore W189806525C114793014 @default.
• W189806525 hasConceptScore W189806525C126645576 @default.
• W189806525 hasConceptScore W189806525C127313418 @default.
• W189806525 hasConceptScore W189806525C155681218 @default.
• W189806525 hasConceptScore W189806525C166390339 @default.
• W189806525 hasConceptScore W189806525C16828302 @default.
• W189806525 hasConceptScore W189806525C17409809 @default.
• W189806525 hasConceptScore W189806525C187320778 @default.
• W189806525 hasConceptScore W189806525C18903297 @default.
• W189806525 hasConceptScore W189806525C205649164 @default.
• W189806525 hasConceptScore W189806525C2777610350 @default.
• W189806525 hasConceptScore W189806525C2780049196 @default.
• W189806525 hasConceptScore W189806525C2780797713 @default.
• W189806525 hasConceptScore W189806525C2816523 @default.
• W189806525 hasConceptScore W189806525C39432304 @default.
• W189806525 hasConceptScore W189806525C58640448 @default.
• W189806525 hasConceptScore W189806525C65589250 @default.
• W189806525 hasConceptScore W189806525C76886044 @default.
• W189806525 hasConceptScore W189806525C86803240 @default.
• W189806525 hasLocation W1898065251 @default.
• W189806525 hasOpenAccess W189806525 @default.
• W189806525 hasPrimaryLocation W1898065251 @default.
• W189806525 hasRelatedWork W1721068294 @default.
• W189806525 hasRelatedWork W1903254212 @default.
• W189806525 hasRelatedWork W1987017053 @default.
• W189806525 hasRelatedWork W2003149059 @default.
• W189806525 hasRelatedWork W2041842542 @default.
• W189806525 hasRelatedWork W2048766732 @default.
• W189806525 hasRelatedWork W2107713364 @default.
• W189806525 hasRelatedWork W2112556614 @default.
• W189806525 hasRelatedWork W2137980061 @default.
• W189806525 hasRelatedWork W2202634429 @default.
• W189806525 hasRelatedWork W2354971674 @default.
• W189806525 hasRelatedWork W2482537525 @default.
• W189806525 hasRelatedWork W2508454030 @default.
• W189806525 hasRelatedWork W2540310899 @default.
• W189806525 hasRelatedWork W2776125580 @default.
• W189806525 hasRelatedWork W2903815440 @default.
• W189806525 hasRelatedWork W3132409551 @default.
• W189806525 hasRelatedWork W3196820180 @default.
• W189806525 hasRelatedWork W56876878 @default.
• W189806525 hasRelatedWork W1501160084 @default.
• W189806525 isParatext "false" @default.
• W189806525 isRetracted "false" @default.
• W189806525 magId "189806525" @default.
• W189806525 workType "dissertation" @default.