Wind Tunnel, LAI/LAD & Albedo Measurements

NTUA Wind tunnel experiments

• ○ Experimental determination of the drag coefficient (Cd) of natural trees/shrubs with different geometric properties.
• ○ Representative deciduous and evergreen species, commonly used in urban areas of Mediterranean region, i.e. i) Clementine, ii) Magnolia, iii) Oleander and iv) Tilia.
• ○ Trees samples' height: 1.8m.
• ○ Examined wind speeds: 1.4m/s-10m/s.
• ○ 3 examined samples of each tree type.

Albedo Measurements

• ○ Use of portable pyranometers to measure the received and reflected radiation by the plants' foliage and definition of the albedo value.
• ○ Measurements conducted for the 4 examined tree types and all samples.

Leaf Area Index/Leaf Area Density Measurements

• ○ Use of a portable canopy analyzer (LAI- 2000 PCA, LI-COR Biosciences, USA) for the LAI definition.
• ○ For each plant, 4 perimetric measurements performed, with the use of a 45 o lens cap, for the better representation of plants' spatial distribution.

Leaf Mass per Area (LMA) Measurements

• ○ Leaf Mass per Area denotes the dry weight of leaves per the respective leaf area.
• ○ LMA measurements performed for all plants.
• ○ From each plant, 10 leaves were collected and taken to the laboratory.
• ○ Samples were collected from each leaf with the use of a borer with known area. The samples were dried in the oven at 80 o C for 48 hours.
• ○ Finally, leaf dry weight was measured with the use of a precision scale.