![Hier klicken, um den Treffer aus der Auswahl zu entfernen](images/unchecked.gif) |
Titel |
Impact of Tidal-Stream Turbines on the Generation of the Higher Tidal Harmonics |
VerfasserIn |
Daniel Potter, Suzana Ilic, Andrew Folkard |
Konferenz |
EGU General Assembly 2016
|
Medientyp |
Artikel
|
Sprache |
en
|
Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 18 (2016) |
Datensatznummer |
250136876
|
Publikation (Nr.) |
EGU/EGU2016-18018.pdf |
|
|
|
Zusammenfassung |
The higher tidal harmonics result from the interaction of the astronomic tides with both
themselves and each other through non-linear processes. In shallower waters such as those
near the coast these non-linear processes become more significant and thus, so too do the
higher tidal harmonics become more significant. The interaction of the tide with tidal-stream
turbines (TSTs), through thrust and drag processes will be non-linear and as such will
contribute to the generation of higher tidal harmonics, thus changing the nature of the
tide downstream of the turbines. The change to the tide may potentially impact
on the downstream energy resource (Robins et al. 2015) and sediment transport
processes (Pingree & Griffiths 1979). This paper will present analytical results, which
suggest that TSTs will impact on the generation of all higher harmonics but with odd
overtides being impacted more than even overtides, the most important examples
of which are the M6 and M4 tides respectively, which are the first odd and even
overtides of the M2 tide. Change in phase and amplitude of the M6 tide by TSTs will
distort the tide but will not cause an asymmetry between the flood and ebb of the
tide. Change in the phase and amplitude of the M4 can not only distort the tide but
also cause asymmetry. Hence any change to the M4 tide by the turbines is more
significant, despite the magnitude of change to the M6 being greater. In order to
gain a fuller understanding of the way in which TSTs change the tide downstream
and the significance of any change for transport processes or energy resource, a
numerical modelling study will be carried out, which will be presented in a future
paper.
Robins, P.E., Neill, S.P., Lewis, M. & Ward, S.L., 2015. Characterising the spatial and
temporal variability of the tidal–stream energy resource over the northwest European shelf
seas. Applied Energy, 147: 510–522.
Pingree, R.D. & Griffiths, D.K., 1979. Sand transport paths around the British Isles
resulting from M2 and M4 tidal interactions. J. Mar. Biol. Ass. U.K., 59: 497–513 |
|
|
|
|
|