A novel two-point mooring for a floating vertical axis tidal turbine platform
Notice bibliographique
Résumé
Tidal energy development in British Columbia (BC), Canada is currently focused on displacing diesel generation in off-grid coastal communities. BC has 434 km2 of sites with peak annual spring currents exceeding 1.5m/s and 52 km2 exceeding 2.5m/s. However, many of these sites are relatively shallow, experiencing large percentage changes in tidal elevation and have significant asymmetry in the flood and ebb current directions due to coastal channel geometry. Proposed projects are in the 50-250kW range and floating moored platforms are suitable as support structures for cost and operational simplicity reasons. This work addresses the design of a unique two-point flexible line mooring for a floating platform supporting a vertical axis turbine at Blind Channel Resort – a tidal demonstration site, located approximately 50 km north of Campbell River. A tidal turbine was previously moored by a rigid arm single-point mooring system at this site that, while effective in optimizing alignment with the current, relied on a submerged rotary electrical slip joint. The slip joint represented a significant point of failure, requiring frequent costly and inconvenient maintenance, given the remoteness of the site. The objective of this work is to replace the rigid single-point mooring and slip joint with a newly designed flexible two-point mooring system. By enhancing the system's affordability and practicality, this new mooring design aims to make small scale, remote, tidal energy installations more viable across BC and other regions. This paper proposes an integration of highly compliant elastic members with traditional mooring line material and Dyneema, in a lazy-S configuration. During low current and low-tide situations, the elastic segments contract, drawing in the excess Dyneema line and preventing the mooring lines from entangling with the sea floor. As the current increases, the elastic segments stretch, and load is shifted onto the Dyneema line. To assess the design, a comprehensive set of tide and current scenarios are established based on data gathered at the site. Acoustic Current Doppler Profilers were utilized at the site and recorded current profiles for a cumulative 364 days. Using this data, five different current elevation profiles were selected as design load cases. System simulations were conducted with ProteusDS software. Initial slack tide simulations assessed the potential for mooring line entanglement with either the seafloor or other lines and provided initial equilibrium configurations of the system for subsequent simulations. The subsequent cases focused on the tidal turbine’s alignment under the five current profile scenarios to ensure that the appropriate alignment was met. Finally, transient simulations were utilized to measure bearing loads in the Dyneema and elastic mooring segments, verifying that the primary load is successfully transferred to the Dyneema as the mooring system extends during current transients. The proposed mooring system eliminates entanglement issues, maintains proper tidal turbine alignment across the full range of current profiles and tidal ranges, and ensures effective load management that meets both operational and safety requirements. This work demonstrates a promising mooring solution for advancing small-scale tidal energy installations in similar settings in BC and beyond.
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Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».