Building Aerodynamics
Written specifically for practicing Architects and Engineers, as well as students, this thorough guide explains topics such as wind, wind environments, ventilation, fire, and sailing, and the relevant expressions they present.
TABLE OF CONTENTS Building Aerodynamics
Chapter 9: Sailing
Sailing is mostly carried out in coastal areas where there are on-shore and offshore winds to supplement the winds generated by normal mechanisms. These extra winds are usually of the gentle sort, in Beaufort ranges 2 to 4. During the development of London Docklands, many of whose waterways were to be used for water sports, discussions took place with sailing enthusiasts about conditions conducive to enjoyable sailing. As some of the clubs were to service beginners, their requirements, as well as those of experienced sailors, who want a challenge, had to be taken into consideration.
9.1 The Problem.
The major factor in the determination of suitability for sailing was wind speed. Three aspects of wind speed were considered. Firstly the mean value of wind speed, say an average over 10 minutes, was considered to be the most important. Secondly the turbulence, or the change of wind speed with time at a given location requires serious attention. Thirdly wind shear, the variation of wind speed with distance, can cause problems.
How were these three aspects to be written into "Criteria of Acceptability?" The first was relatively easy; discussions with sailors suggested limiting values of wind speed between which sailing would be possible. Sailors usually talk in terms of the Beaufort Scale, and the Beaufort Scale includes both mean wind speed and turbulence, the turbulence being specified by the environment. The same approach was made in determining the criteria of acceptability for built environments, and this was discussed in Chapter 4. In...
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