Structural Response of Seawave Slotcone Generators (SSG): Analysis of a Nearshore Device
- Mariano Buccino (University of Napoli Federico II) | Daniela Salerno (University of Napoli Federico II) | Mario Calabrese (University of Napoli Federico II)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- physical modeling, Wave Energy Converters, wave loadings, underpressures, wave overtopping
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- 11 since 2007
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The prediction of loadings exerted by waves on Seawave Slot-cone Generators still suffer from a lack of knowledge, although a good body of literature exists on their hydraulic-performances. Only recently a set of equations have been proposed, which provide estimation of the mean and maximum pressures at the front face of the WEC. Based on results of new regular wave measurements conducted with an accurate 3D balance, this paper provides tentative formulae for underpressures and overtopping generated seaward directed horizontal force peaks.
NATURE OF THE PROBLEM
OverTopping Devices (OTDs) are Wave Energy Converters (WECs) based on the overtopping principle. They usually employ a sloping plate to enhance wave runup and lead water into a reservoir, where energy is extracted via a low head turbine. After the pioneering example of Tapchan (Falcao, 2004) and the floating device Wave Dragon (Kofoed et al., 2006), “structurally monolithic” converters have been developed, which can be used either as independent device or incorporated into the body of conventional maritime structures. Vicinanza et al. (2013) and Contestabile et al. (2017) studied the case of a reservoir integrated within a rubble mound breakwater, whereas the case of a nearshore composite seawall was investigated by Buccino et al. (2015a).
This paper focuses on the Seawave Slotcone Generator (Vicinanza et al., 2012; Figure 1), which includes a number of reservoirs placed on the top of each other to capture the run-up wedge under different climate conditions. This kind of WEC has recently drawn a noticeable attention and 2 pilot plants have been planned to be constructed along the coasts of Norway. Moreover, Margheritini et al. (2012) studied the possibility of implementing a SSG device in the new breakwater of the Hanstholm Port Expansion (Denmark). Despite its hydraulic response has been accurately studied under both 2D and 3D seas (e.g., Margheritini et al., 2008, 2009), SSGs still suffer from a lack of knowledge about its structural response, that may limit its practical use. After the first study by Vicinanza and Frigaard (2008), a probabilistic design method was proposed by Buccino et al. (2015b). experiments by Vicinanza et al. (2015) and Buccino et al. (2016), it allowed to predict only wave loadings at the outer face of the device, and accordingly needs to be conveniently integrated.
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