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  • 1
    Electronic Resource
    Electronic Resource
    CHARACTERISTICS AND CONTROLS OF GRAVEL-BED RIFFLES: AN ANALYSES OF DATA FROM THE RIVER-HABITAT SURVEY (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 18 (2004), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: This paper presents an analysis of data from the UK Environment Agency's River Habitat Survey database relating to bedform type and frequency. Emphasis is given to the gravel-bed riffle which (a) traditionally has been considered to be a fundamental morphological unit diagnostic of river stability, and (b) more recently has become an important design component in channel restoration and rehabilitation schemes. Data were sufficient to support the identification of distinct, catchment-scale controls determining the circumstances under which step-pools and riffles occur, and key local-scale influences upon riffle frequency and spacing. This demonstrates that the database can be used to support a broad geomorphological analysis. Suggestions are made for the interpretation of results obtained from the existing database, and for possible future modifications to enhance its geomorphological value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.2004.tb00535.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Island-dominated landscapes of large floodplain rivers, a European perspective (2002)
    Oxford UK : Blackwell Science Ltd.
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The landscapes of large floodplain rivers are characterised by heterogeneous environments related to the interplay of flood flows, sediment transport and vegetation dynamics.2. The large rivers of Europe, and probably most rivers throughout the forest biomes, were characterised by islands but over the period of major human interference, many have become dominated by incision and narrowing so that they are now characterised by single-thread and relatively simple channel forms.3. Vegetation plays an active role in developing heterogeneous channel forms through (a) biotic processes such as seed dispersal, vegetative regeneration and succession and (b) abiotic effects such as increasing flow resistance inducing sedimentation, and decreasing bank erodibility.4. In particular, accumulations of living driftwood (cf. dead driftwood accumulations and dispersed seedlings) accelerate sedimentation and island development.5. River reaches with vegetated islands have a high habitat diversity.6. The natural influences of flood disturbance, wood accumulation, vegetation growth, island development and tree die-off, cause island-dominated reaches to undergo cycles of island growth and decay that are related to cycles of aquatic habitat diversification and simplification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00923.x
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  • 3
    Electronic Resource
    Electronic Resource
    Development, Flood Risk and the Urban Environment: Experiences from the River Tame (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 15 (2001), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Experience and knowledge of river-restoration schemes are generally available at the reach scale. However, there are problems with the application of this knowledge at the scale of large urbanised catchments which relate to understanding the system and predicting the impact of management strategies. This paper considers problems of developing a perceptive and efficient rehabilitation strategy for a large urbanised catchment, with specific reference to the River Tame in the West Midlands. Consideration is given to (a) rainfall-runoff relationships, (b) assessment of water quality and ecological status, and (c) predicting the impact of various management strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.2001.tb00328.x
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  • 4
    Electronic Resource
    Electronic Resource
    The effects of water abstractions on invertebrate communities in U.K. streams (1995)
    Springer
    Hydrobiologia 308 (1995), S. 167-182 
    Details
    ISSN: 1573-5117
    Keywords: water abstraction ; macroinvertebrates ; streams ; ordination ; United Kingdom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract There are increasing concerns about the ecological effects of water abstraction and in the UK, these concerns have been hightened by the 1976, 1984 and 1988-92 droughts. This paper assesses macroinvertebrate and environmental changes induced by surface and groundwater abstractions on 22 streams throughout the UK. The approach involved comparative research to assess differences between reference and impacted sites. Using a database comprising 204 sets of biological and environmental data (89 taxa and 16 environmental variables) a preliminary ordination using principle components analysis clearly differentiated three types of sites: upland, lowland and an intermediate type. At this scale, any effects of abstractions on invertebrate communities are shown to be insignificant relative to regional controls. A simultaneous ordination of the environmental and faunal differences between pairs of sites was undertaken separately for each of the three regional groups. Differences are considered as vectors having both direction and amplitude and the analysis elucidates common patterns in the faunal and environmental data. Important changes were observed in two situations: upland streams affected by major diversions as part of hydro-power schemes in Scotland and lowland rivers impacted by groundwater abstractions. No strong patterns of change (either in amplitude or orientation) were demonstrated within any of the taxonomic groups. However, within the upland type some rheophilous taxa were shown typically to be reduced in abundance at impacted sites. Within the lowland type, a consistent pattern in the dataset is demonstrated by a group of taxa that are reduced in abundance at the impacted sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006869
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  • 5
    Electronic Resource
    Electronic Resource
    Channel changes and invertebrate faunas below Nant-Y-Moch dam, River Rheidol, Wales, UK (1985)
    Springer
    Hydrobiologia 122 (1985), S. 65-80 
    Details
    ISSN: 1573-5117
    Keywords: river channel ; sedimentation ; invertebrates ; dam ; time-scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract River impoundment is known to affect the physical, chemical, and biological characteristics of the downstream river, but little is known of the way in which changes of these characteristics interact or the time-scale required to attain a new quasi-equilibrium state. The data presented herein show that channel sedimentation below a tributary confluence, resulting from reduced flow competence and capacity within the regulated mainstream, has produced morphological changes associated with substrate particle-size alteration. Four physical compartments are identified, each representing a different stage of readjustment to the hydrological conditions imposed by the dam. Each stage is shown to have a characteristic fauna. Moreover, the species diversity, composition, and biomass were found to be most different from the natural data during the early stages of readjustment and to approach the natural data more closely as the channel attained a quasi-equilibrium form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018961
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    Paper (German National Licenses)
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