Stochastic analysis of crop yield uncertainty, field scale study
Date
2011
Authors
Alzraiee, Ayman, author
GarcĂa, Luis, author
Colorado State University, publisher
Journal Title
Journal ISSN
Volume Title
Abstract
Spatial heterogeneity of soil properties and uncertainty in root uptake model parameters make the numerical prediction of crop yield prone to a high degree of uncertainty. In this study, the spatial soil parameters are treated as multivariate correlated regionalized random parameters. Sequential indicator simulation is used to generate three-dimensional dependant realizations for hydraulic conductivity, porosity, Van Genuchten parameters and dispersivity. Other semi empirical parameters that control crop water uptake and subsurface drainage conductance where also randomized. Four hundred realizations for each of the soil parameters were generated and processed in the variably saturated flow and transport model (CSUID) to obtain the spatial statistical moments of the relative crop yield, root zone salinity and salt leaching fraction. The statistical distributions of drainage flow and salinity hydrographs were also calculated. Results show that parameter uncertainty significantly affects in-field relative crop yield variability and drainage flow and salinity effluent.
Description
2011 annual AGU hydrology days was held at Colorado State University on March 21 - March 23, 2011.
Includes bibliographical references.
Includes bibliographical references.