Estimates of the roughness length at Dutch Air Quality Monitoring Network stations and on a grid basis over the Netherlands
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Open Access
Type
Report
Language
en
Date
1990-06-30
Research Projects
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Journal Issue
Title
Estimates of the roughness length at Dutch Air
Quality Monitoring Network stations and on a grid basis over the
Netherlands
Translated Title
Schattingen van de ruwheidslengte voor stations in
het Landelijk Meetnet Luchtkwaliteit en in een regelmatig rooster over
Nederland
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Abstract
Abstract niet beschikbaar
For each station in the Air Quality Monitoring Network in The Netherlands, where wind speed and wind direction are measured, roughness length values were calculated from the standard deviation of wind direction. The agreement between values presented here and those obtained by other methods is good. The uncertainty is estimated to be a factor 2. For each 1 x 1 km2, 5 x 5 km2 and 10 x 10 km2 gridcell over The Netherlands roughness length values were estimated using detailed information about landuse and forest characteristics. A comparison of these maps with those presented in the literature showed good agreement. Comparison of the grid average z0 values with those of the LML stations showed reasonable agreement, except for those which are surrounded by roughness elements in the near vicinity of the measuring location and for those which are situated in areas with very low roughness lengths. The uncertainty in the grid average z0 values is assumed to be about 40 - 60%.
For each station in the Air Quality Monitoring Network in The Netherlands, where wind speed and wind direction are measured, roughness length values were calculated from the standard deviation of wind direction. The agreement between values presented here and those obtained by other methods is good. The uncertainty is estimated to be a factor 2. For each 1 x 1 km2, 5 x 5 km2 and 10 x 10 km2 gridcell over The Netherlands roughness length values were estimated using detailed information about landuse and forest characteristics. A comparison of these maps with those presented in the literature showed good agreement. Comparison of the grid average z0 values with those of the LML stations showed reasonable agreement, except for those which are surrounded by roughness elements in the near vicinity of the measuring location and for those which are situated in areas with very low roughness lengths. The uncertainty in the grid average z0 values is assumed to be about 40 - 60%.
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