The impact of sensitivity and uncertainty of soil physical parameters on the terms of the water balance: Some case studies with default R packages. Part II: Results and discussion

Jan Wesseling*, Joop Kroes, Thalita Campos Oliveira, Francisco Damiano

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

Abstract

These papers (part I and part II) emphasize the need for sensitivity and uncertainty analyses. A number of techniques are applied, e.g. latin hypercube sampling, impact response surfaces and Sobol-analyses. Five examples are presented, four of them concerning the numerical model Swap. The data generation and analysis is performed with standard R packages. Although the computations can be made on any computer, the most time-consuming examples in this paper have been run on a High Performance Computer Cluster. With the relatively simple Impact Response Surface technique it is shown that variation of the saturated hydraulic conductivity has far less impact than changing the moisture content at saturation. Analyses according to the Sobol-Jansen method show that when the soil physical relationships are described according to Damiano, then the parameter b has a very large influence on the results. If the well-known Mualem - Van Genuchten equations are applied, most variation can be explained by the parameter n.

Original languageEnglish
Article number105072
JournalComputers and Electronics in Agriculture
Volume170
Early online date13 Nov 2019
DOIs
Publication statusPublished - Mar 2020

Keywords

  • HPC
  • IRS
  • LHS
  • Numerical model
  • R
  • Sensitivity
  • Sobol
  • Swap
  • Uncertainty

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