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~ ~ ~ PURPOSE ~ ~ ~
this subroutine distributes potential plant evaporation through
the root zone and calculates actual plant water use based on soil
water availability. Also estimates water stress factor.
~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
name |units |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
gx |
ir |
j |none |HRU number
k |none |counter (soil layer)
reduc |none |fraction of water uptake by plants achieved
|where the reduction is caused by low water
|content
sum |
sump |
wuse |mm H2O |water uptake by plants in each soil layer
sum_wuse |mm H2O |water uptake by plants from all layers
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
Intrinsic: Exp, Max
~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
compute aeration stress
compute limiting water stress
initialize variables
let second layer compensate - 10 mm layer causes problems when root depth is shallow
soil layer loop
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