Comments on ‘‘Improving the Numerical Simulation of Soil Moisture–Based Richards Equation for Land Models with a Deep or Shallow Water Table’’

摘要

Zeng and Decker (2009, hereafter ZD09) recently discussed the effect of truncation errors in a numerical solution of Richards equation often used to model vertical soil water flow in land models for weather and climate studies. They adopted a cross-disciplinary approach by applying an established meteorological method to a soil physical problem. Their solution involved subtracting from the original equation the solution at hydrostatic equilibrium in order to eliminate the truncation errors.