Coastal Wind Measurements and Power Assessment Using a LIDAR on a Pier

Abstract

This paper reports the first LIDAR measurements obtained on a fishing pier in Santa Catarina, southern Brazil. A laboratory was built to monitor the vertical structure, time and directional variability of winds in the transitional region between the ocean and the continent. A meteorological station provided pressure, temperature, wind and humidity data. Prevailing winds tend to blow from the NE along the coastline, strongly influenced by the South Atlantic Subtropical High Pressure center. Sea and land breezes had significant amplitude. The offshore wind component (sea breeze) was generally active from 11:00 to 20:00 h; the onshore component (land breeze) from 22:00 to 09:00 h. Weak vertical shear and increasing wind speeds were typically observed in the early afternoon, while stronger shear and the highest wind speeds tend to occur in the late afternoon. Winds profiles from the ocean sector were usually more intense and less sheared. The average power of wind turbines was estimated. The local resource is nearly 2.5 times greater than that of a site located 9.3 km inland. The use of coastal laboratories was demonstrated to be a cost-saving solution for long-term monitoring of the country's wind resources.

Coastal Wind Power in Southern Santa Catarina, Brazil

“…Two pioneer studies monitored winds on the coast of Piauí [29,30], one for Espírito Santo State [31]. Thus, A preliminary analysis of the first 6 months of LIDAR wind data was conducted by Correa (2018) [17], Nassif et al (2020) [18] and Pires (2019) [19]. Here we extend the period of analysis, and cover two years of data from January 2017 to December 2018.…”

“…where D p (W m −2 ) is the power density, ρ a is the local air density (kg m −3 ), and U is the horizontal wind speed at a height of 110 m. Air density ρ a was calculated with air temperature T ( • C), relative humidity RH (%), and atmospheric pressure P (hPa) records from BOOA, following [18]. The data gaps were covered by information from the Torres meteorological station, supplied by the National Institute of Meteorology (INMET) (Figure 1).…”

“…The highest percentages of northeasterly winds occurred in 2018 for September (17.1%), October (18.7%), and November (20.3%). Several studies have identified wind patterns with northeast and southwest wind directions [17][18][19]60,61].…”