scientimate.mindurationshallow#

tmin, tminhat, Fetchhat, hhat = scientimate.mindurationshallow(windvel, Fetch, hmean, CalcMethod='karimpour', dispout='no')

Description#

Calculate a minimum required wind duration for wave to be fetch limited in shallow and intermediate water

Inputs#

windvel: Wind velocity in (m/s)

Wind velocity should be measured (or represents velocity) at 10 m above surface

Wind velocity should be a 10 minutes averaged wind for all methods, except for for ‘spmshallow’ methods

For ‘spmshallow’ methods, wind velocity should be converted to duration of sustained wind by using gust factor
Fetch: Wind fetch in (m)
hmean: Mean water depth along a wind fetch in (m)
CalcMethod=’karimpour’: Parametric wave model to be used for calculation

‘spmshallow’: Use method by Shore Protection Manual (SPM),

U.S. Army Corps of Engineers (1984) in shallow and intermediate water water

‘karimpour’: Use method by Karimpour et al. (2017)
dispout=’no’: Define to display outputs or not (‘yes’: display, ‘no’: not display)

Outputs#

tmin: Minimum required wind duration for wind to be fetch limited in (second)
tminhat: Dimensionless minimum required wind duration for wind to be fetch limited: tminhat=g*tmin/U10
Fetchhat: Dimensionless wind fetch: Fetchhat=g*Fetch/U10^2
hhat: Dimensionless mean water depth along a wind fetch: hhat=g*hmean/U10^2

Note, g=9.81: gravitational acceleration

U10: wind velocity

Examples#

import scientimate as sm
import numpy as np

windvel=10*np.random.rand(100)
Fetch=10000*np.random.rand(100)
hmean=3*np.random.rand(100)
tmin,tminhat,Fetchhat,hhat=sm.mindurationshallow(windvel,Fetch,hmean,'karimpour','no')

windvel=10
Fetch=np.arange(1e3,1e6,1000)
hmean=3
tmin,tminhat,Fetchhat,hhat=sm.mindurationshallow(windvel,Fetch,hmean,'karimpour','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.

Department of the Army, Waterways Experiment Station, Corps of Engineers, and Coastal Engineering Research Center (1984), Shore Protection Manual, Washington, D.C., vol. 1, 4th ed., 532 pp.

Karimpour, A., Chen, Q., & Twilley, R. R. (2017). Wind Wave Behavior in Fetch and Depth Limited Estuaries. Scientific reports, 7, 40654.

scientimate.mindurationshallow

Contents