scientimate.sustainedwindduration

SustWindDur = scientimate.sustainedwindduration(windvel, winddir, MaxwindvelVar=2.5, MaxwinddirVar=15, WindInterval=3600, dispout='no')

Description

Calculate the sustained wind duration

Inputs

windvel

Wind velocity time series data in (m/s)

winddir

Wind direction time series data in (Degree)

MaxwindvelVar=2.5

Maximum allowed wind velocity variation around a mean to allow wind to be considered sustained in (m/s)

Coastal Engineering Manual (2015) suggests 2.5 m/s

MaxwinddirVar=15

Maximum allowed wind direction variation around a mean to allow wind to be considered sustained in (Degree)

Coastal Engineering Manual (2015) suggests 15 degree

WindInterval=3600

Time interval between two consecutive wind measurements (data points) in (second)

dispout=’no’

Define to display outputs or not (‘yes’: display, ‘no’: not display)

Outputs

SustWindDur

Sustained Wind Duration in (second)

Examples

import scientimate as sm

#Data from https://tidesandcurrents.noaa.gov for Grand Isle, LA, USA (8761724), for June 1st, 2017, reported hourly
windvel=[3,4.7,4.9,5.3,3.3,3.4,3.3,3.8,3.1,2,1.3,1.2,1.5,3.2,2.9,3,2.9,3.7,3.7,3.1,3.4,2.6,2.5,2.5] #24 Hour wind velocity
winddir=[78,86,88,107,131,151,163,163,153,150,148,105,105,75,95,103,97,103,108,111,124,183,171,113] #24 Hour wind direction
SustWindDur=sm.sustainedwindduration(windvel,winddir,2.5,15,3600,'yes')

References

U.S. Army Corps of Engineers (2015). Coastal Engineering Manual. Engineer Manual 1110-2-1100, Washington, D.C.: U.S. Army Corps of Engineers.

Yamartino, R. J. (1984). A comparison of several “single-pass” estimators of the standard deviation of wind direction. Journal of Climate and Applied Meteorology, 23(9), 1362-1366.