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4. Methods of Information Acquisition for Planning
(Nature measurements, Wind tunnels, Modelling)

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4.2.3.2 Methods

For the study of the changes to be expected from the planned development,

  • sand erosion experiments were taken for surface-covering evaluation (see also Chapter 4.2.2.3) and
  • wind velocity measurements were taken with the help of a hot-wire anemometer (see also Chapter 4.2.2.4) for the study of singular, especially wind-exposed points.

The main wind directions 40°, 220°, and 240° were studied for both the current and planned states.
Windgeschwindigkeit (m/s)

Effekt

to approx. 1.5 calm, no noticeable air flow
approx. 1.6 - approx. 3.3 in the face perceptible air flow
approx. 3.4 - approx. 5.4 wind moves light flags
approx. 5.5 - approx. 7.9 paper flies up, hair-style is destroyed
approx. 8.0 - approx. 10.7 wind force at the body clearly noticeably
approx. 10.8 - approx. 13.8 to use umbrellas with trouble
approx. 13.9 - approx. 17.1 difficulties when going

Table 4/1: Connection between wind velocity and wind effect upon humans (from STIEMER, 1977)

For the evaluation of such studies it is important to know the relevant wind comfort criteria. These can be distinguished between those related to hourly average values of wind velocity (Table 4/1) and those related to the wind velocity of gusts (Table 4/2).

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