期刊
RENEWABLE ENERGY
卷 196, 期 -, 页码 839-855出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.07.030
关键词
Ocean energy; Resource mapping; Unmanned aerial vehicles; Surface velocimetry; Oceanography; Remote sensing
资金
- EPSRC Supergen ORE Hub [EP/S000747/1]
- European Regional Development Fund through the Ireland Wales Cooperation programme
- SEEC (Smart Efficient Energy Centre) at Bangor University - European Regional Development Fund (ERDF)
- EPSRC fellowship [METRIC: EP/R034664/1]
- TIGER project - European Regional Development Fund through the Interreg France (Channel) England Programme
- Selkie Project
This study evaluates the performance of drone-based large-scale particle image velocimetry (LSPIV) for tidal stream resource assessment at three sites. The results show that under favorable environmental conditions, this technique provides satisfactory accuracy for first-order tidal resource assessments.
Resource quantification is vital in developing a tidal stream energy site but challenging in high energy areas. Drone-based large-scale particle image velocimetry (LSPIV) may provide a novel, low cost, low risk approach that improves spatial coverage compared to ADCP methods. For the first time, this study quantifies performance of the technique for tidal stream resource assessment, using three sites. Videos of the sea surface were captured while concurrent validation data were obtained (ADCP and surface drifters). Currents were estimated from the videos using LSPIV software. Variation in accuracy was attributed to wind, site geometry and current velocity. Root mean square errors (RMSEs) against drifters were 0.44 m s(-1) for high winds (31 km/h) compared to 0.22 m s(-1) for low winds (10 km/h). Better correlation was found for the more constrained site ((r)2 increased by 4%); differences between flood and ebb indicate the importance of upstream bathymetry in generating trackable surface features. Accuracy is better for higher velocities. A power law current profile approximation enables translation of surface current to currents at depth with satisfactory performance (RMSE = 0.32 m s(-1) under low winds). Overall, drone video derived surface velocities are suitably accurate for first-order tidal resource assessments under favourable environmental conditions. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license
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