Influence of obstacles on the aerodynamic roughness of the Netherlands
The aim of this study was to analyse the influence of large- and small-scale obstacles (orography, tree lines, and dikes) on the effective aerodynamic roughness of the Netherlands, a relatively flat, small-scale landscape. The roughness averaging approach was based on drag coefficients. The effective roughness was locally dominated by small-scale obstacles such as tree lines and dikes. Even at a regional scale (40,000 km(2)), the small-scale obstacle drag was of the same order of magnitude as the shear stress due to landuse. The neglect of those obstacles on a regional scale would result in ap... Mehr ...
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| Dokumenttyp: | Artikel |
| Erscheinungsdatum: | 1999 |
| Reihe/Periodikum: | Jong , J J M D , Vries , A C D & Klaassen , W 1999 , ' Influence of obstacles on the aerodynamic roughness of the Netherlands ' , Boundary-Layer Meteorology , vol. 91 , no. 1 , pp. 51-64 . https://doi.org/10.1023/A:1001888629613 |
| Schlagwörter: | aerodynamic roughness / flat landscape / obstacles / orography / roughness length / tree lines / BOUNDARY-LAYER / COMPLEX TERRAIN / TURBULENT-FLOW / MODELS / PARAMETERIZATION / LANDSCAPE / LENGTHS |
| Sprache: | Englisch |
| Permalink: | https://search.fid-benelux.de/Record/base-29191870 |
| Datenquelle: | BASE; Originalkatalog |
| Powered By: | BASE |
| Link(s) : | https://hdl.handle.net/11370/a4a7d9ea-d1fd-4524-8617-036c70d509b9 |
The aim of this study was to analyse the influence of large- and small-scale obstacles (orography, tree lines, and dikes) on the effective aerodynamic roughness of the Netherlands, a relatively flat, small-scale landscape. The roughness averaging approach was based on drag coefficients. The effective roughness was locally dominated by small-scale obstacles such as tree lines and dikes. Even at a regional scale (40,000 km(2)), the small-scale obstacle drag was of the same order of magnitude as the shear stress due to landuse. The neglect of those obstacles on a regional scale would result in approximately 10% overestimated averaged windspeed at 10 m above the surface. It was concluded that small-scale obstacles need to be taken into account to calculate the aerodynamic roughness of flat landscapes. Orography was of minor importance in this lowland country.