MMIJ: Measurement Campaign

For 4 years ECN will do measurements on the meteorological mast IJmuiden. All the data is stored in a database and will be made publically available on this website. At three different heights, in three different directions, booms are installed. Sensors are placed on these 9 booms, on the top of the mast and on the roof of the measurement container, measuring wind speed, wind direction, air pressure, temperature, rainfall and relative humidity. A LIDAR system is placed in the mast to measure wind speeds above the mast, up to a height of 300 meter.
A wave buoy is placed in the sea, next to the mast, to measure current and wave properties. 

The below list gives an overview of the signals that are measured on the mast.

The LIDAR measures wind speeds and directions far above the mast, at 90, 115, 140, 165, 190, 215, 240, 265, 290 and 315m. The LIDAR signals are general signals and signals for each height.

The wave buoy gives the following signals one per hour.

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

Data that is not in order is 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.