Lichteiland Goeree

On a distance of about 30 km south-west from Hoek van Holland a platform called Lichteiland Goeree is situated. The coordinates of the platform are: 51°56′ NB, 3°40′ OL. The platform serves as a beacon for ships on the North sea and is also used for meteorological measurements by KNMI and Rijkswaterstaat (RWS).

LEG

Introduction

The Wind Energy department of TNO Energy Transition & Materials carries out a meteorological measurement program for the government (Ministry of Climate Policy and Green Growth) in the Dutch part of the North Sea. We provide developers and other interested parties with information about the meteorological conditions for future wind farms in the North Sea. We are currently carrying out measurements at four measurement locations (Europlatform – EPL, K13A, L2-FA-1 and Lichteiland Goeree – LEG). In addition, historical data sets are available from a number of measurement locations, such as Meteorological Measuring Mast IJmuiden (MM-IJ) and Meteorological Measuring Mast OWEZ (MM-OWEZ).

Measurement campaign LEG

Since the end of 2014 TNO is performing meteorological measurements on Lichteiland Goeree (LEG) with a LiDAR. All the data is stored in a database and is made publicly available on this website. A LIDAR system is mounted on the platform.

The LIDAR measures wind speeds and directions at 62, 90, 115, 140, 165, 190, 215, 240, 265 and 290m. The LIDAR signals provided are general signals and measurement height specific signals.

Abbreviation

Signal name

 Units

LEG_Int_Temp

Internal temperature

°C

LEG_Wiper_count

Number of wiper activations

-

LEG_HXXX_CNR

Mean carrier-to-noise ratio

dB

LEG_HXXX_CNR_min

Minimum carrier-to-noise ratio

dB

LEG_HXXX_Data_Avail

Data availability

%

LEG_HXXX_DSB

Doppler spectral broadening

Hz

LEG_HXXX_Wd

Mean wind direction

°

LEG_HXXX_Ws

Mean wind speed

m/s

LEG_HXXX_Ws_max

Maxiumum wind speed

m/s

LEG_HXXX_Ws_min

Minimum wind speed

m/s

LEG_HXXX_WsDisp

Standard deviation of the wind sped

m/s

LEG_HXXX_Z-Ws

Vertical wind speed component

m/s

LiDAR installation and maintenance - Vaisala Windcube V2

To perform wind speed measurements, a Vaisala Windcube V2.1 has been installed that can measure up to a height of 300 meters above sea level. The laser beam is safe for the eyes according to IEC EN 60825-1, January 2008.

Since October 2014 the LiDAR performs measurements at the platform. The LiDAR is regularly maintained and replaced with a newly calibrated LiDAR.

Data validation

During measurements failures can occur. This is why the measured data is checked for errors to prevent ‘pollution’ of the database. This happens in two steps:

1. The measurement computer checks for failures such as

  • No connection with a sensor
  • No connection with the measurement system
  • A value of a signal exceeds a minimum or maximum value

2. The measured data is daily checked manually for deviations

This data is filtered out and marked as ‘invalid’. When requesting the data from the database the ‘invalid’ data is not provided, so the user can be confident working with valid data.

Accreditation

Measurements on platforms LEG, EPL, K13A and L2-FA-1 are performed by TNO under accreditation 'L324 meteorological measurement'.

L324 - Raad voor Accreditatie (rva.nl)

Data

To download the data from LEG, you will be redirected to the Nimbus website, after registration, the data is accessible. The Nimbus website is only available in English.

Download data