Sheltering and Obstacle - Modelling of a Circular Water Tank

[Dhanraj]

Hi,

In relation to obstacles, I encountered that WAsP, at this time, does not allow for a circular geometric shape.

The wind monitoring campaign was conducted at the site where there is a circular water tank. At this site, measurement of wind speed and direction were done at 10 m and 40 m, respectively.

The closest point between this water thank and the wind mast was about 45 m. Additionally, the estimated height of the water tank is 6 m and a diameter of about 30 m.

In consideration of WAsP, how can I develop an obstacle map in WAsP, with minimal error, to reflect the presence of a circular water tank, as described in the above?

Thank you.

D.Bachai

[Niels Gylling Mortensen]

Dear D. Bachai,
Yes, WAsP can only handle rectangular boxes for obstacles, so you have to find a 'box size' to represent the circular obstacle. If you experiment a little with this, you will probably find that the 40-m anemometer is not influenced significantly by the obstacle (40 m being way higher than three times the 6-m water tank). The 10-m level will be influenced, but because of the proximity of the water tank, the obstacle model may not give realistic result. Your experimental setup would require a different type of modelling to obtain reliable results -- and even then it would still be difficult...
Best regards,
Niels

[Dhanraj]

Thanks Niels