cal_capillaryRise {simET}

Calculating capillary rise

Description

Calculating capillary rise

Usage

cal_capillaryRise(
  a1,
  b1 = -0.17,
  a2,
  b2 = -0.27,
  a3 = -1.3,
  b3,
  a4,
  b4,
  Dw,
  Wa,
  LAI,
  ETm
)

Arguments

a1

Soil water storage to maximum root depth at field capacity(mm).

b1

A parameter.

a2

storage above the average between those at field capacity and the wilting point(mm).

b2

A parameter.

a3

A parameter.

b3

A parameter.6.7 for clay and silty clay loam soils, decreasing to 6.2 for loamy sands

a4

A parameter.4.6 for silty loam and silty clay loam soils,decreasing to 6.2 for loamy sands.

b4

A parameter.-0.65 for silty loam soils and decreasing to -2.5 for loamy sand soils.

Dw

Groudwater depth below root zone(m).

Wa

actual soil water storage in the root zone.

LAI

Leaf area index.

ETm

potential crop evaporanspiration (mm/day),usually ETm=ETc(mm/d).

Value

The value for capillary Rise (mm/day).

References

Liu Y, Pereira L S, Fernando R M. Fluxes through the bottom boundary of the root zone in silty soils: Parametric approaches to estimate groundwater contribution and percolation[J]. Agricultural Water Management, 2006, 84(1):27-40.