water (version 0.5)

SWtrasmisivity: Calculates short wave transmisivity

Description

Short wave transmisivity is estimated for broad-band considering an extended equation developed by Allen (1996), based from Majumdar et al.(1972), using coefficients developed by ASCE-EWRI (2005).

Usage

SWtrasmisivity(Kt = 1, ea, dem, incidence.hor)

Arguments

Kt

unitless turbidity coefficient 0

ea

near-surface vapor pressure (kPa)

dem

digital elevation model

incidence.hor

solar incidence angle, considering plain surface

References

R. G. Allen, M. Tasumi, and R. Trezza, "Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC) - Model" Journal of Irrigation and Drainage Engineering, vol. 133, p. 380, 2007

Majumdar, N.; Mathur, B. & Kaushik, S. Prediction of direct solar radiation for low atmospheric turbidity Solar Energy, Elsevier, 1972, 13, 383-394

ASCE-EWRI The ASCE Standardized Reference Evapotranspiration Equation Report of the ASCE-EWRI Task Committee on Standardization of Reference Evapotranspiration, 2005