Impact of Fixed-Bottom Offshore Wind Farms on the Surrounding Wave Field
- Georgia Sismani (Aristotle University of Thessaloniki) | Aurélien Babarit (Ecole Centrale de Nantes - CNRS) | Eva Loukogeorgaki (Aristotle University of Thessaloniki)
- Document ID
- International Society of Offshore and Polar Engineers
- International Journal of Offshore and Polar Engineering
- Publication Date
- December 2017
- Document Type
- Journal Paper
- 357 - 365
- 2017. The International Society of Offshore and Polar Engineers
- Offshore wind farm, diffraction effects, potential flow theory, wave field, wave-structure interaction
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In this paper, the effect of an Offshore Wind Farm (OWF) on the surrounding wave field is numerically investigated in the frequency domain through the use of a Boundary Element Method (BEM) numerical model based on the potential flow theory. The analysis is performed for regular waves of various periods and incident wave directions and for irregular waves with variable peak periods and significant wave heights. Specific cases of regular and irregular waves are compared, revealing the differences between the regular wave model and the real sea states. Through the numerical simulation of the incident wave and the scattering effects caused by the OWF, indications are provided regarding the impact of the OWF on the local wave climate. Finally, the impact of hydrodynamic interaction effects on the forces applied to the offshore wind turbines is examined.
In recent years, the increasing energy demand has led to a growing interest in the efficient exploitation of renewable energy sources. Under this framework, offshore wind energy has become an increasingly attractive option, offering multiple benefits and addressing effectively the well-known obstacles and problems associated with the exploitation of wind energy onshore (Henderson et al., 2003; Breton and Moe, 2009). Consequently, the offshore wind energy sector is continuously growing, and this has resulted in the large-scale commercial deployment of Offshore Wind Farms (OWFs), especially in the coastal and offshore areas of northern Europe (EWEA, 2015). So far, most OWFs operating in Europe have been installed in shallow waters of average depth equal to 22.4 m and at an average distance from the shore equal to 32.9 km (EWEA, 2015). Moreover, the deployed support structures correspond mainly to fixed bottom configurations, i.e., the monopile, tripod, and jacket (EWEA, 2015).
Although OWFs may contribute significantly to the coverage of the increasing energy demands, their installation and operation should be implemented by not only the consideration of economic and engineering factors but also the assessment and prediction of reliably possible negative environmental impacts on the corresponding marine environment (e.g., the undesirable effects on the local wave climate, changes in sediment transport patterns, loss of biodiversity, etc).
|File Size||5 MB||Number of Pages||9|