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Technical seminar on measurement of wind profile with a buoy mounted LiDAR
Supported by:
- The Hong Kong Institution of Engineers, Environmental Division - Department of Land Surveying & Geo-Informatics, The Hong Kong Polytechnic University - The Hong Kong Society for Remote Sensing
Date: Friday 21 June, 2013 Time: 7:00pm – 7:45pm Venue: Room CF305, The Hong Kong Polytechnic University, Hung Hom Language: English Enquiries: Ir. Ian SOLOMON E-mail: [email protected] Tel: 2697 1126 Registration: Not required. 50 seats are available on a first come, first served basis.
Attendance certificates will be issued.
Speaker: Mr. Jan-Petter MATHIESEN, Fugro OCEANOR A/S, Trondheim, Norway Abstract: Traditionally, wind profile measurements for offshore wind farms have been obtained by using cup
anemometers mounted on wind masts, which are typically around 80m high. In the past few years, the
use of LiDAR systems for offshore wind measurements has become more popular, and although project
financers currently still require well-understood cup anemometer data for energy assessment, using a
LiDAR to acquire the wind profile data permits fewer cup anemometers to be installed on a much smaller
mast.
Where there are no externally-imposed requirements for cup anemometers, such as for performance
measurements in an operational wind farm, it is a desirable goal to obtain offshore wind data in a more
cost-effective and flexible manner by eliminating the wind mast structure, and using a buoy mounted
LiDAR. In addition to the wind data, a buoy can also measure waves, current profile and other
oceanographic parameters. The wave measurements can be used to compensate for the effects of
buoy movement on the LiDAR measurements, which previously hindered acceptance of the use of buoy-
mounted wind instrumentation.
In the spring of 2012, a field trial was carried out to demonstrate the practicality of a buoy-mounted
LiDAR system. A commercially available wind-profiling LiDAR system was mounted on a well-proven
oceanographic buoy designed for severe environmental conditions. The trial was performed in the
waters off the town of Titran on the island of Frøya in central Norway.
This was an ideal test site as it is in a very harsh environment, and is also only 2.5km from an existing
onshore test centre for wind measurements with three instrumented wind masts. There was also a
reference LiDAR located at the wind test centre. During the month-long trial, the buoy-mounted LiDAR
recorded 10 minutes average wind profile at 10 heights from 11.5m to 218m in significant wave heights
of 0.5m to 3.6m.
Following the trial, it was established that there was good correlation with the measurements between
the buoy-mounted LiDAR and the reference LiDAR, although there was some scatter thought to be
due to the distance between the two LiDARs, and that the fact that the reference LiDAR is located on
land. We are therefore planning to compare the buoy mounted LiDAR measurements with
measurements taken from offshore wind masts closer to the test site.
About the speaker: Jan-Petter Mathisen is a meteorologist and the manager of the metocean consultancy group at Fugro
OCEANOR A/S in Trondheim, Norway, and was project manager for the development of the
SEAWATCH Wind LiDAR Buoy used in this trial.
Jan-Petter Mathisen has been working at Fugro OCEANOR for 25 years, and has been project manager
for several metocean measurements and data analysis projects for the oil & gas industry.
CF305 is on the 3rd floor – one level up from the podium.