1,521 research outputs found
Assessing the importance of river bank erosion for fine sediment delivery to Bassenthwaite Lake
No full textAvailable evidence from lake sediment core records and short-term sediment flux sampling programs has suggested increased fine sediment deposition and suspended sediment transfers to Bassenthwaite Lake, Cumbria, U.K over recent decades. This increase in sedimentation has been associated with a decline in water quality in the lake which is thought to have had serious consequences for the population of the vendace (Coregonu albula), which also declined markedly during the 1990ร and into the 21 St Century. Recent studies of sediment delivery risk in the catchment have suggested that there are potentially large sediment sources in the lowland river network, especially the River Derwent between Derwent Water and Bassenthwaite Lake. The aim of this research is to describe the characteristics of fluvial suspended sediment transfers to Bassenthwaite Lake through direct monitoring of the River Dement and Newlands Beck (at the head of Bassenthwaite Lake) in order to assess the potential contribution of river bank erosion on the lowland River Derwent to fine sediment delivery. Three suspended sediment monitoring stations at Portinscale and Low Stock Bndge on the River Derwent and at Newlands Beck Bridge are used to assess changes in sediment transport along these important river reaches. The potential contribution of river bank erosion to fluvial sediment delivery was assessed by river bank mapping and surveying of erosion features on the 5.7km reach of the River Derwent between Derwent Water and Bassenthwaite Lake, along with a detailed study of morphological change on three river banks near Low Stock Bridge using a terrestrial laser scanner. The main findings of this project suggest that the River Derwent dominates suspended sediment transfers to Bassenthwaite Lake. The fine sediment load transported on the Derwent is over five times greater than that of Newlands Beck and the mean suspended sediment concentration on the lower Derwent is 56% higher than that on Newlands Beck. Specific catchment sediment yields for the River Derwent and Newlands Beck, based on effective drainage area, are 50.871 km(^2) a(^-1) and 35.721 km2 a(^-1) respectively. A high proportion of all suspended sediment transfers in the lowland Bassenthwaite Lake catchment were observed to occur in high-magnitude, low-frequency flow events, with approximately two- thirds of total suspended sediment transport occurring in just over 10% of the time. There is also direct evidence for increased fine sediment supply on the lowland River Derwent, as an estimated 1,158 ta(^-1) increase in the overall sediment load was observed on the 3.7 km reach of the Derwent between Portinscale and Low stock Bridge. Hysteresis analysis and analysis of suspended sediment transfers during high flow events on the Derwent support this hypothesis. Overall, 21.1% of all river banks on the River Derwent were assessed as eroded, with 9.4% of banks undergoing active river bank erosion. Therefore, it is suggested that river bank erosion is a significant fine sediment source in the lowland Bassenthwaite catchment, and that it is responsible for a large proportion of sediment inputs on the lowland River Derwent (c. 18.9%), and ultimately to Bassenthwaite Lake
Rev. Derwent Coleridge, ca. 1860\u27s
No full textRev. Derwent Coleridge, ca. 1860\u27s, col. Derwent was a child of Samuel Taylor Coleridge. distinguished scholar and author. In 1864 he accepted from Bishop Tait the rectory of Hanwell. Finding the parish church a long way from the population, he set to work to build a new one in the midst of them, and it was consecrated on the last day of 1879, when he was in his eightieth year.https://mds.marshall.edu/marshall_regional_photograph_collection/1423/thumbnail.jp
The Derwent Project
No full text<p>The Derwent project is a collaboration between artists David Stephenson and Martin Walch; it visualises in new ways the complex natural and cultural history of Tasmania’s Derwent River system. This vast and often inaccessible environment includes Aboriginal and colonial heritage alongside ten hydroelectric developments; its multiple layers of space and time present opportunities to synthesise artistic and scientific paradigms of representation by drawing on geography, history, and archaeology. The visual outcomes will be new forms of immersive time-based digital imaging that evocatively reveal hidden layers of environmental information to both specialist and general audiences, by creating the first immersive 360º representation of an entire river system.</p>
<p>The aim of the Derwent project is to produce a new aesthetic of experiencing a multilayered landscape over time, conveying its rich layering of information with clarity and impact. This is being achieved through the development of a highly portable means of image and sound capture that creates a powerful immersive representation of an intimate experience of remote environments; a means of layering additional environmental and historical information within these immersive representations; and a display approach that can cost-effectively present these immersive experiences in a range of different exhibition spaces</p>
The floods of the Lake District - Part I
No full textThis report summarises the annual rainfall of the River Derwent catchment area and examines the floods of 1931 and 1932. The author uses data from the Meteorological Office to examine if the floods were extraordinary and takes into account local lakes in reducing the magnitude of the flood. Areas that are presented in more detail are Bassenthwaite Lake, Thirlmere, Cockermouth, Keswick, Newlands and Coledale Beck. (PDF contains 38 pages
Export of Asian pollution during two cold front episodes of the TRACE-P experiment
No full textTwo cold front episodes were sampled during the two flights out of Yokota, Japan, during the Transport and Chemical Evolution Over the Pacific (TRACE-P) experiment during March 2001. The data from these two flights are examined using a mesoscale three-dimensional model. We show how these cyclonic systems have impacted the export of pollution out of the Asian continent. We contrast the relative role of convection and ascent in the warm conveyor belts associated with the cyclone during these two episodes. Although the necessary meteorological conditions for an efficient export of pollution are met during flight 13 (i.e., the occurrences of the warm conveyor belt near the source regions), no significant pollution is simulated in the mid-Pacific in the lower and middle troposphere. The efficient ventilation of the WCB by convection near the coast, the advection by the anticyclonical flow above 700 hPa, and the downward motion associated with the Pacific high in the remote ocean significantly prevent any long-range transport of undiluted pollution in the WCB. During flight 15 the conveyor belts have already moved to the remote ocean. The polluted plume is split by the rising air in the warm conveyor belt which transports CO-poor air northward and by the oceanic convection which transports clean air masses upward. These mechanisms lead to the dilution of Asian pollution in WCB en route to North America and add to the episodic nature of the Asian outflow by fragmenting the pollution plume
Radiative forcing from aircraft NOx emissions: Mechanisms and seasonal dependence
No full textA chemistry-climate model has been applied to study the radiative forcings generated by aircraft NOx emissions through changes in ozone and methane. Four numerical experiments, where an extra pulse of aircraft NOx was emitted into the model atmosphere for a single month (January, April, July, or October), were compared to a control experiment, allowing the aircraft impact to be isolated. The extra NOx produces a short-lived (few months) pulse of ozone that generates a positive radiative forcing. However, the NOx and O3 both generate OH, which leads to a reduction in CH4. A detailed analysis of the OH budget reveals the spatial structure and chemical reactions responsible for the generation of the OH perturbation. Methane's long lifetime means that the CH4 anomaly decays slowly (perturbation lifetime of 11.1 years). The negative CH4 anomaly also has an associated negative O3 anomaly, and both of these introduce a negative radiative forcing. There are important seasonal differences in the response of O3 and CH4 to aircraft NOx, related to the annual cycle in photochemistry; the O3 radiative forcing calculations also have a seasonal dependence. The long-term globally integrated annual mean net forcing calculated here is approximately zero, although earlier work suggests a small net positive forcing. The model design (e.g., upper tropospheric chemistry, convection parameterization) and experimental setup (pulse magnitude and duration) may somewhat influence the results: further work with a range of models is required to confirm these results quantitatively
Le prieuré de Derwent, ou Mémoires d'une orpheline. Tome 1 / , par l'auteur d'Eliza, traduit de l'anglais par P.-L. Le Bas
No full textTitre original : Derwent priory or Memoirs of an orphanAvec mode text
The rhetoric of disfigurement in First World War Britain
No full textDuring the First World War, the horror of facial mutilation was evoked in journalism, poems, memoirs and fiction; but in Britain it was almost never represented visually outside the professional contexts of clinical medicine and medical history. This article asks why, and offers an account of British visual culture in which visual anxiety and aversion are of central importance. By comparing the rhetoric of disfigurement to the parallel treatment of amputees, an asymmetrical picture emerges in which the ‘worst loss of all’—the loss of one’s face—is perceived as a loss of humanity. The only hope was surgical or, if that failed, prosthetic repair: innovations that were often wildly exaggerated in the popular press. Francis Derwent Wood was one of several sculptors whose technical skill and artistic ‘wizardry’ played a part in the improvised reconstruction of identity and humanity
Le prieuré de Derwent, ou Mémoires d'une orpheline. Tome 2 / , par l'auteur d'Eliza, traduit de l'anglais par P.-L. Le Bas
No full textTitre original : Derwent priory or Memoirs of an orphanAvec mode text
Poems. With a memoir of his life
No full textMemoir by Derwent Coleridge: v. 1, p. [ix]-ccxv.Mode of access: Internet
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