Displacement height

Calculates the displacement height caused by an obstacle (e.g., a crop field). This function works for both vegetation and urban environments.

Usage

turb_displacement(...)

# Default S3 method
turb_displacement(obs_height, surroundings = "vegetation", ...)

# S3 method for class 'weather_station'
turb_displacement(weather_station, surroundings = "vegetation", ...)

Arguments

...

Additional arguments.

obs_height

Numeric. Height of vegetation or buildings in meters (m).

surroundings

Character. Type of surroundings. Options: "vegetation" or "city".

weather_station

Object of class weather_station

Value

Numeric. Displacement height in meters (m).

Details

This function calculates the displacement height (\(d\)) caused by an obstacle, such as vegetation or buildings. The displacement height is an important parameter in boundary layer meteorology as it affects the wind profile near the ground.

For vegetation, the displacement height is calculated as two-thirds of the obstacle height.

For urban environments (dense housing), the displacement height is calculated as 80% of the obstacle height. These are package parameterizations cited to Bendix (2004) method background.

References

Bendix, J. (2004). Weather and Climate: An Introduction. Springer.

Examples

# Calculate displacement height for vegetation with a height of 10 meters
turb_displacement(obs_height = 10, surroundings = "vegetation")
#> [1] 6.666667

# Calculate displacement height for a city with buildings of height 10 meters
turb_displacement(obs_height = 10, surroundings = "city")
#> [1] 8