cal_soilSurfaceResistance

Calculating soil surface resistance

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_soilSurfaceResistance function

<dl><dt>tau</dt>
<dd>soil tortuosity (taken as 2)</dd>
<dt>l</dt>
<dd>is the dry soil layer thickness (taken as the first soil layer thickness) (m)</dd>
<dt>PHI_p</dt>
<dd>is soil porosity</dd>
<dt>Dm_v</dt>
<dd>the vapor diffusion coefficient in air (24.7 10-6 m2 s-1)</dd>
<dt>lambda_p</dt>
<dd>the soil pore-size distribution index from the Brooks-Corey equation.</dd>
<dt>THETA_v_l</dt>
<dd>volumetric soil water content (m-3 m-3) of the first soil layer</dd>
<dt>THETA_v_sat_l</dt>
<dd>saturated soil water content (m3 m-3) of the first soil layer</dd></dl>

Arguments

Calculating soil surface resistance — cal_soilSurfaceResistance

<dl>

<dt>tau</dt>
<dd>soil tortuosity (taken as 2)</dd>


<dt>l</dt>
<dd>is the dry soil layer thickness (taken as the first soil layer thickness) (m)</dd>


<dt>PHI_p</dt>
<dd>is soil porosity</dd>


<dt>Dm_v</dt>
<dd>the vapor diffusion coefficient in air (24.7 10-6 m2 s-1)</dd>


<dt>lambda_p</dt>
<dd>the soil pore-size distribution index from the Brooks-Corey equation.</dd>


<dt>THETA_v_l</dt>
<dd>volumetric soil water content (m-3 m-3) of the first soil layer</dd>


<dt>THETA_v_sat_l</dt>
<dd>saturated soil water content (m3 m-3) of the first soil layer</dd>

</dl>

cal_soilSurfaceResistance: Calculating soil surface resistance

Description

Usage

Value

Arguments