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Open AccessArticle

Investigation of the Fetch Effect Using Onshore and Offshore Vertical LiDAR Devices

1
National Institute of Advanced Industrial Science and Technology, Koriyama 963-0298, Japan
2
Department of Marine Resources and Energy, Tokyo University of Marine Science and Technology, Tokyo 108-8477, Japan
3
Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan
4
National Institute of Maritime, Port and Aviation Technology, Yokosuka 239-0826, Japan
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(9), 1408; https://doi.org/10.3390/rs10091408
Received: 12 August 2018 / Revised: 31 August 2018 / Accepted: 2 September 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Remote Sensing of Atmospheric Conditions for Wind Energy Applications)
An offshore wind measurement campaign using vertical light detection and ranging (LiDAR) devices was conducted at the Hazaki Oceanographic Research Station (HORS) as part of an investigation into determining the optimal distance from the coast for a nearshore wind farm from a meteorological perspective. The research platform was a 427 m long pier located on a rectilinear coastline on the Pacific coast of the central Honshu Island in Japan. The relationship between the ratios of the increase of wind speed near the surface and fetch length within 5 km of the coast was analyzed via LiDAR observations taken at heights from 40 to 200 m. The results showed that the speed of the coastal wind blowing from land to sea gradually increased as the fetch length increased, by approximately 15–20% at 50 m above sea level around a fetch length of 2 km. Moreover, empirical equations were derived by applying the power law to the relationship between the increase of wind speed and fetch lengths at 1–5 km, as obtained from the LiDAR measurements. It was also found that the wind speed increase at a 2 km fetch length was equivalent to the effect of a 50–90 m vertical height increase on the coast in this region. View Full-Text
Keywords: coastal wind measurement; vertical Light Detection and Ranging; NeoWins; fetch effect; Hazaki Oceanographical Research Station; empirical equation coastal wind measurement; vertical Light Detection and Ranging; NeoWins; fetch effect; Hazaki Oceanographical Research Station; empirical equation
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MDPI and ACS Style

Shimada, S.; Takeyama, Y.; Kogaki, T.; Ohsawa, T.; Nakamura, S. Investigation of the Fetch Effect Using Onshore and Offshore Vertical LiDAR Devices. Remote Sens. 2018, 10, 1408.

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