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Résumé :
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In chapter 1, we describe the surface layer the context of a boundary layer over flat ground. In chapter 2, we discuss surface layer structure again in the context of a boundary layer over flat ground but from the point of view of spectral behavior. Here the functional forms complement those of the time-averaged properties in chapter 1. Together, they set the stage for our discussions of flow over more complicated terrain. Chapter 3 draws us into the first level of complexity, flat terrain with uniform vegetation. We investigate the interaction between the wind and the plant canopy and how the canopy modifies the universal relations described in the first two chapters. In chapter 4, we abandon horizontal homogeneity and the one-dimensional simplicity that it brought to surface layer formulations to discuss changes in surface conditions and the advective boundary layers they generate. Chapter 5 takes us from the relatively well understood flat earth to the complications of hills and valleys. New coordinate systems and new methods of analysis are needed to describe the flow over such a landscape. Chapters 6 and 7 deal with the practical aspects of boundary layer investigation. A knowledge of instrumentation options and analysis strategies is crucial to the planning of any experiment, but even users of processed data benefit from the knowledge of how the data were obtained and treated.
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