Gordyola
Well-Known Member
Re: Etihad Campus & potential new stadium
The majority of the drying is by the air movement being a closed bowl and below ground level it is essential to get air movement to the pitch hence the shutters, so dont dismiss these lightly
ste.sully said:The louvres at each corner of the stadium could be easily removed without much detriment to the pitch. I don't think they do too much to be honest, although I can see why they were added due to the pitch being built into the ground as such like a Roman amphitheatre and why the stadium appears taller on the inside. The luminescent lining on the roof of the stadium which allows more sunlight to permeate the pitch is far more important than the louvres.1.618034 said:BlueAnorak said:You can't easily fill in the corners with the current roof structure. The ground anchor cables that support the tension ring exit through the corners smack bang where the the lower part of a third tier would be. The corners also let enough natural daylight through the open shutters (closed on match days) to keep the grass green.
I thought the shutters were to let natural air circulation in, to make the grass grow stronger...?
The majority of the drying is by the air movement being a closed bowl and below ground level it is essential to get air movement to the pitch hence the shutters, so dont dismiss these lightly
Pitch ventilation
An inherent problem in designing large stadia is to create a roof that not only shelters (with ‘drip-line’ cover to all spectators) but also ventilates the pitch. Daylight, sunlight, and air movement over the pitch are essential for healthy grass growth but a wind-free and comfortable arena is also needed.
The dramatic roof form and corresponding stand configuration allowed movable louvre vents in the high-level corner voids. These vents can be adjusted to increase or decrease airflow through the Stadium, and thus benefit
not only air movement over the pitch but also the spectator environment. Similar low-level vents are also incorporated in the corner exit gates.
Under most circumstances these precautions would have been adequate to ensure good grass growth, but Arup wanted to ensure the very best pitch possible. A further ventilation system was therefore added, this time beneath the pitch as for golf courses. At close centres perforated pipes were laid; these double for pitch drainage and through them air can be either pumped or sucked. Humidity detectors in the root zone of the turf show the groundsmen when the pitch is too humid and needs drying out, or is too dry and requires watering. Another benefit of the system is that
air can be pumped direct to the base of the turf, thereby oxygenating the root zone and increasing turf growth.