The role of geo-environmental factors in landscape and visual assessment for shallow-water offshore structures

Abstract

Although the offshore wind power has been harvested for relatively long time, there is a lack of knowledge on the specific geotechnical and planning considerations relevant to construction of wind farms in shallow waters. The aim of this study is to propose a new integrated framework for landscape and visual assessment of shallow offshore developments in the south of Brazil and the north of Scotland. The study sites have contrasting bio-geo-climatic characteristics and, while Scotland is considered to be at the forefront of the offshore wind energy utilization, Brazil has only recently started to show interest in such developments because wind energy is considered as new but promising especially in lake areas. The focus of this study is on the geo-environmental impact assessment for shallow-water wind farms in terms of landscape capacity and vulnerability, with a special focus on the geo-environmental parameters. This study outlines the current practice in the determination of geo-environmental parameters for planning and construction in relation to seascape/landscape assessment, while highlighting the gaps in knowledge and consideration of critical geotechnical information within a sustainability framework. A seascape capacity assessment is proposed for the two sites, where the geotechnical parameters are determined in conjunction with economic, societal, and environmental factors through a desk study, site survey and preliminary ground investigations. Additionally, construction impact assessment, risk assessment and monitoring of the geo-environmental variables are proposed as tools for enhancing the engagement with the planning authorities and affected communities. The future refinements and enhancements of this framework will depend on the efforts of the geotechnical engineering community to persuade the planning decision makers, affected communities, and the clients of the importance of the life cycle geo-environmental parametrization for the sustainability of the project.