cal_frictionVelocity

Supports the calculation of meteorological characteristics in
evapotranspiration research and reference crop evapotranspiration, and offers
three models to simulate crop evapotranspiration and soil water balance in
the field, including single crop coefficient and dual crop coefficient,
as well as the Shuttleworth-Wallace model. These calculations main refer to
Allen et al.(1998, ISBN:92-5-104219-5), Teh (2006, ISBN:1-58-112-998-X), and
Liu et al.(2006) <doi:10.1016/j.agwat.2006.01.018>.

Minguo Liu

simET

Tools for Simulation of Evapotranspiration of Field Crops and
Soil Water Balance

Huimin Yang

cal_frictionVelocity function

<dl><dt>k</dt>
<dd>the von Karman constant (0.4)</dd>
<dt>zr</dt>
<dd>the height of the weather station(m).</dd>
<dt>u_zr</dt>
<dd>the wind speed(m/s) at the reference height zr (m).</dd>
<dt>d</dt>
<dd>zero plane displacement height (m)</dd>
<dt>z0</dt>
<dd>the crop roughness length(m)</dd></dl>

Arguments

Calculating friction velocity — cal_frictionVelocity

<dl>

<dt>k</dt>
<dd>the von Karman constant (0.4)</dd>


<dt>zr</dt>
<dd>the height of the weather station(m).</dd>


<dt>u_zr</dt>
<dd>the wind speed(m/s) at the reference height zr (m).</dd>


<dt>d</dt>
<dd>zero plane displacement height (m)</dd>


<dt>z0</dt>
<dd>the crop roughness length(m)</dd>

</dl>

cal_frictionVelocity: Calculating friction velocity

Description

Usage

Value

Arguments