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| Titel |
Do weirs influence a river's hydrosedimentological response to flood events? |
| VerfasserIn |
Amelia Bulcock, Elizabeth Whitfield, Jose Lopez Tarazon, R. Greg Whitfield |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250101383
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| Publikation (Nr.) |
 EGU/EGU2015-510.pdf |
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| Zusammenfassung |
| Weirs are the most common anthropogenic pressures in British river systems. The agenda for
catchment-scale restoration of river systems, largely driven by the EU Water Framework
Directive (WFD – 2000/60/EC), has led to a recognition that many of these structures may
need to be removed to re-establish more ‘natural’ processes to river systems. These physical
barriers impact rivers severely, modifying hydrology (i.e. creating artificial flow regimes),
sediment flux (i.e. interrupting the sediment transfer through river systems), and channel
forms at different scales (i.e. changing downstream erosion and deposition patterns). They
also alter greatly the natural fluvial processes, hence making the regulated rivers behave
significantly different to natural unmodified river channels. However, the above impacts,
and the majority of accepted models for response to weir installation/removal, are
conceptual and based on empirical observations. In fact, the impact of weirs on rivers
hydro-geomorphology and sediment transport is largely unconstrained and poorly
understood. Further to this, even less knowledge and research surrounds the impacts of weirs
on individual flood events. The current study aims to use empirical observations of
river flow (i.e. water monitoring), sediment transport (both suspended and bedload)
and sedimentology (i.e. bed stability, sediment entrainment, long-term planform
changes/evolution) together with climatic, hydrological and sedimentological modeling to
improve the understanding of weirs’ affectation on the river’s hydro-geomorphology at
several timescales (i.e. from singular flood events to annual/centurial scales). A step
beyond the present project is to use the data and the knowledge that will be gained to
better address/model the geomorphic adjustment of rivers following weir removal. |
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