wind_rose.pptx

wind_rose for airport

1. Wind Rose Prepared by : Abdul Rahim Hour Hesham A. Abu Ghaly Supervisor : Prof.dr . eng shafik Jendia

2. INTRODUCTION A wind rose depicts the frequency of incidence of winds in each of the particular wind direction sectors and wind speed modules for a specified site and time period. The most regular structure consist of a circle from which eight or sixteen lines come out, one for each direction. The length of each line is comparative to the occurrence of wind from which direction and the occurrence of calm conditions is entered in the center.

3. INTRODUCTION The wind roses are widely applicable in the fields such as Environmental impact assessment, industrial emissions measurements, oceanography, wind energy, agriculture engineering, ambient air monitoring, air quality measurements, indoor air quality testing, air dispersion modelling, noise impact modelling and soil impact modelling.

4. Wind Rose The wind rose is the time honored method of graphically presenting the wind conditions, direction and speed, over a period of time at a specific location.

5. Wind Rose Rose wind is a naval term given to those original four known geographically (North, South, East and West). These trends are called according to the names of the stars in the sky, a traditional method of ancient sailors to guide their navigational ways.

6. Historical view In the sixteenth century,(Ibn Majid Albahhar ) invented the rose wind and used it with a magnetic compass, and Fractionated Rose wind on the horizon circle by the original to 32 sections . Ibn Majid has made North refers to the ( Aljah ). South refers to the ( Kotb Suhail ) or the (star Suhail ). the Middle refers to ( Matla Najem Altaer ). and west to the ( Matla Najem Altaer ).

7. How to read Wind Rose By Using a polar coordinate system of gridding, the frequency of winds over a long time period is plotted by wind direction, with color bands showing wind ranges. The directions of the rose with the longest spoke show the wind direction with the greatest frequency 1 Knot = 1.852 Km/h

8. Steps to develop a wind rose diagram from hourly observations are: 1. Analysis for wind direction 2. Determination of frequency of wind in a given wind direction 3. Analysis for mean wind speed 4. Preparation of polar diagram

9. Steps to develop a wind rose diagram from hourly observations are: * % Frequency = Number of observations * 100/Total Number of Observations * Direction: N, NNE, ------------------------,NNW, Calm (depend on the kind of wind rose ) * Wind speed: Calm, 1-3, 4-6, 7-10, (depend on categories )

10. How to read Wind Rose The wind rose located in the top right corner of each data map shows the general wind direction and speed for each sampling period. The circular format of the wind rose shows the direction the winds blew from and the length of each "spoke" around the circle shows how often the wind blew from that direction. For example, the wind rose above shows that during this particular sampling period the wind blew from the west 30% of the time, and from the north and the northeast 12% of the time, etc.

11. How to read Wind Rose The different colors of each spoke provide details on the speed, in knots (1 knot=1.15 mph), of the wind from each direction. Using the example above, the longest spoke shows the wind blew from the west at speeds between 1-4 knots (light blue) about 4% of the time, 4-7 knots (dark green) about 18% of the time and 7-11 knots (dark blue) about 7% of the time.

12. Airport Runway Orientations • The analysis of wind data is fundamental in many sectors, One of such sectors is the designing of airport runways.

13. Airport Runway Orientations The orientation of runway depends upon the direction of the wind and some extent on the area available for development .

14. Airport Runway Orientations Wind perpendicular to the runway (crosswinds) may cause serious accidents, especially during landing and for small airplanes. Then analysis of past accidents ( van Es , van der Geest & Nieuwpoort , 2001) has demonstrated that the probability of occurrence of an accident increases with increasing crosswind conditions.

15. Airport Runway Orientations The direction of the runway Controls the layout of the other airport facilities, such as passenger terminal, taxiways, apron configurations, circulation roads and parking facilities.

16. Runway Design: According to FAA Standards “150- 530013A”, runways should be oriented so that aircraft can take off and/or land at least 95% of the time with out exceeding the allowable crosswinds. Runway are always oriented in the direction of prevailing wind

17. Crosswinds and tailwinds

18. Crosswinds and tailwinds

19. Crosswinds and tailwinds

20. Crosswinds and tailwinds

21. We will discuss three airports orientation, and wind roses Catania – Italia Barcelona – Spain Valencia – Spain

22. Catania – Italia

23. Barcelona – Spain

24. Valencia – Spain

25. reference - JAIRM, 2014 – 4(2), 97-116 Online ISSN: 2014-4806 – Print ISSN: 2014-4865 - http ://dx.doi.org/10.3926/jairm.26 an EPA meteorological monitor located on the roof of the EPA Willowbrook Warehouse - https://novalynx.com/store/pc/What-Is-a-Wind-Rose-d55.htm - https :// en.wikipedia.org/wiki/Wind_rose https ://en.wikipedia.org/wiki/Josep_Tarradellas_Barcelona%E2%80%93El_Prat_Airport -