Header menu link for other important links
X
Global sensitivity analysis of distributed hydrological models
Published in American Society of Agricultural and Biological Engineers
2008
Volume: 11
   
Pages: 6713 - 6721
Abstract
The application of physics based distributed models in watershed analysis has increased in the last few decades due to increased availability special data and advanced special analysis tools. These models have the advantage of better representation of the system which produces more accurate and reliable outputs. However, they are characterized by their large parameter size, which causes lot of uncertainty in the model output. The calibration of such models is also typically complex due to the large number of parameters. Sensitivity analysis of the parameters is performed prior to calibration in order to simplify the calibration procedure; nonetheless the commonly employed sensitivity analysis methods generally do not consider the nonlinear relationship between the parameters and the output. The current study focuses on performing the nonlinear sensitivity analysis on a distributed watershed model. The method utilizes the Sobol's sensitivity approach, which is based on decomposing the total variance of the model output in terms of individual parameter's contribution. The parameter sampling is performed by Latin hypercube sampling in this study. The output of the analysis help ranking the parameters of the model in terms of their sensitivity towards the model output, thereby help pruning the parameters that are to be calibrated. The method is demonstrated using soil and water assessment tool (SWAT) developed for St. Joseph watershed, USA.
About the journal
JournalAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
PublisherAmerican Society of Agricultural and Biological Engineers
Open AccessNo
Concepts (20)
  •  related image
    Calibration
  •  related image
    Hydraulic models
  •  related image
    Landforms
  •  related image
    Watersheds
  •  related image
    ANALYSIS TOOLS
  •  related image
    CALIBRATION PROCEDURES
  •  related image
    DISTRIBUTED HYDROLOGICAL MODELS
  •  related image
    DISTRIBUTED MODELS
  •  related image
    DISTRIBUTED WATERSHED MODELS
  •  related image
    Global sensitivity analysis
  •  related image
    LATIN HYPERCUBE SAMPLINGS
  •  related image
    MODEL OUTPUTS
  •  related image
    Non-linear relationships
  •  related image
    NONLINEAR SENSITIVITY ANALYSIS
  •  related image
    Physics-based
  •  related image
    SENSITIVITY APPROACHES
  •  related image
    SOIL AND WATER ASSESSMENT TOOLS
  •  related image
    ST. JOSEPH WATERSHEDS
  •  related image
    WATERSHED ANALYSIS
  •  related image
    Sensitivity analysis