Average Surface Roughness for 2-Dimensional Atmospheric flow

Mandeville, Milène (2023) Average Surface Roughness for 2-Dimensional Atmospheric flow. Bachelor's Thesis, Applied Mathematics.

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Abstract

Roughness length represents the height at which the wind flow becomes zero, under neutral atmospheric conditions and in the absence of any obstacles. It is strongly related to the height of the different elements in a heterogeneous terrain. In this thesis, we consider two homogeneous regions, grassland and forest, under either a single- or multi-layer model, following Klaassen (1992) and Luppes (1993). We interest ourselves in finding an average roughness length to represent the entire heterogeneous terrain when considering larger scale meteorological simulations. Such an average length, also called the `effective roughness length' (ERL) is computed in four manners, as detailed by André and Blondin~(1986), Taylor (1989), de Vries et. al. (2003), and finally by simply averaging the logarithmic law.\\ We compare the four methods and relate these to the output wind profile for different terrains, and conclude that de Vries et al.'s effective roughness length is the most accurate.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Luppes, R. and Sterk, A.E.
Degree programme:	Applied Mathematics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	13 Jul 2023 06:25
Last Modified:	13 Jul 2023 06:25
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/30589

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