KepertWindField

Grid point vortex Wind field, wind vectors. Kepert, J., 2001: The Dynamics of Boundary Layer Jets within the Tropical Cyclone Core.Part I : Linear Theory.J.Atmos.Sci., 58, 2469 - 2484

Methods for generating modelled parametric Tropical Cyclone (TC) spatial hazard fields and time series output at point locations from TC tracks. R's compatibility to simply use fast 'cpp' code via the 'Rcpp' package and the wide range spatial analysis tools via the 'terra' package makes it an attractive open source environment to study 'TCs'. This package estimates TC vortex wind and pressure fields using parametric equations originally coded up in 'python' by 'TCRM' <https://github.com/GeoscienceAustralia/tcrm> and then coded up in 'Cuda' 'cpp' by 'TCwindgen' <https://github.com/CyprienBosserelle/TCwindgen>.

Julian O'Grady

TCHazaRds

Tropical Cyclone (Hurricane, Typhoon) Spatial Hazard Modelling

KepertWindField function

<dl><dt>rMax</dt>
<dd>radius of maximum winds in km</dd>
<dt>vMax</dt>
<dd>maximum wind velocity calculation in m/s</dd>
<dt>vFm</dt>
<dd>input forward velocity of TC</dd>
<dt>thetaFm</dt>
<dd>input forward direction of TC</dd>
<dt>f</dt>
<dd>single coriolis parameter at the centre of TC in hz</dd>
<dt>Rlam</dt>
<dd>two columns for distances and Cartesian direction clocwise from the x axis from grid points to TC centre in km</dd>
<dt>VZ</dt>
<dd>array two columns velocity then vorticity</dd>
<dt>surface</dt>
<dd>equals one if winds are reduced from the gradient level to the surface, otherwise gradient winds.</dd></dl>

Arguments

Kepert Wind Field — KepertWindField

<dl>

<dt>rMax</dt>
<dd>radius of maximum winds in km</dd>


<dt>vMax</dt>
<dd>maximum wind velocity calculation in m/s</dd>


<dt>vFm</dt>
<dd>input forward velocity of TC</dd>


<dt>thetaFm</dt>
<dd>input forward direction of TC</dd>


<dt>f</dt>
<dd>single coriolis parameter at the centre of TC in hz</dd>


<dt>Rlam</dt>
<dd>two columns for distances and Cartesian direction clocwise from the x axis from grid points to TC centre in km</dd>


<dt>VZ</dt>
<dd>array two columns velocity then vorticity</dd>


<dt>surface</dt>
<dd>equals one if winds are reduced from the gradient level to the surface, otherwise gradient winds.</dd>

</dl>

KepertWindField: Kepert Wind Field

Description

Usage

Value

Arguments