Wind Climate Quiz

Question 1

What is/are the reason(s) for pressure differences in the athmosphere?

Answer 1

• Solar radiation and heating
• Distribution of day and night duration

Question 2

Please find the right couples:

1. Between Hadley and Ferrel cell

Answer 2

Flow is directed towards the earth surface

Question 3

Please find the right couples:

2. Jetstream

Answer 3

Straight flow, oriented with latitude.

Question 4

Please find the right couples:

3. Hadley cell, Ferrel cell and polar cell

Answer 4

Rotational flow, tangential to earth surface and tropopause

Question 5

Please find the right couples:

4. High pressure region

Answer 5

Rotation clockwise in northern hemisphere

Question 6

Please choose the rigth statments:

A. A height dependent profile of the flow parameters is formed in the boundary layer.

B. The boundary layer depends on the wind zone

C. Boundary layer is caused by friction.

D. Near ground level, the turbulences decreases

E. The boundary layer describes the ditance between building and next forrest

F. Dependent on roughness categories, the height profiles can be described

Answer 6

A. A height dependent profile of the flow parameters is fromes in the boundary layer

C. Boundary layer is caused by friction

F. Dependent on roughness categories, the height profil can be described

Question 7

Please mark which statments are true for the basic wind velocity vb:

A. Occurs wihthin a period of t = 50 years theoretically once

B. Is different for different roughness categories

C. Requires wind zone 2

D. Is definded in a unique height of 100m

E. Assumes a roughness category II

Answer 7

A. Occurs within a period of t = 50 years theoretically once.

E. Assumes a roughness category II

Question 8

Please select which statment concerning the natural boundary layer are true:

A. Differs over height with respect to mean velocity and turbulence

B. The height profil can normally be analysed based on the weather data of a given meteorlogical station

C. Does not depend on the wind direction for all locations

D. Is generally turbulent in the building relevant regions

E. Descriptive parameter can be found in “wind zone maps”

Answer 8

A. Differs over height with respect to mean velocity and turbulence

D. Is generally turbulent in the building relevant regions

Question 9

Please connect the described wind characteristics with a suitable statistical distribution:

All wind speeds, measured over a long time period e.g. 1 year (prevalent wind)

Answer 9

Weibull Distribution

Question 10

Please connect the described wind characteristics with a suitable statistical distribution:

All wind speed values within a short time period of 10 min. or 1 hour.

Answer 10

Normal Distribution

Question 11

Please connect the described wind characteristics with a suitable statistical distribution:

Maximum yearly wind speeds of several years wind observation

Answer 11

Gumbel Distribution

Question 12

Please bring the following steps to analyze meteorological data for an analysis of the characteristic wind speed (e.g. the basic velocity ) in the right order.

a. Calculation of the probabilities which are associated with the extreme wind speeds

b. Determination of the extreme wind speed

c. Determination of the velocity for a aimed target probability

d. Grouping data in yearly partitions.

e. Linear Interpolation

f. Plotting wind speeds over probability in a Gumbel plot paper (or using the reduced variate)

Answer 12

d)
b)
a)
f)
e)
c)