scientimate.sustainedwindduration#

SustWindDur = scientimate.sustainedwindduration(windvel, winddir, MaxwindvelVar=2.5, MaxwinddirVar=15, WindTimeInterval=3600, window_length=7, 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
WindTimeInterval=3600: Time interval (time step) between two consecutive wind measurements (data points) in (second)

Example: for 60-min measurement interval: WindTimeInterval=3500 (s)
window_length=7: Number of data points in sliding window for calculating moving average values, must be odd
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,2.5,15,3600,7,'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.

Change point detection: * https://en.wikipedia.org/wiki/Change_detection * https://en.wikipedia.org/wiki/Step_detection * https://www.mathworks.com/help/signal/ref/findchangepts.html * https://www.mathworks.com/help/matlab/ref/ischange.html * deepcharles/ruptures

scientimate.sustainedwindduration

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