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Local sensitivity analysis for compositional data with application to soil texture in hydrologic modelling

Lien Loosvelt (UGent) , Hilde Vernieuwe (UGent) , Valentijn Pauwels (UGent) , Bernard De Baets (UGent) and Niko Verhoest (UGent)
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Abstract
Compositional data, such as soil texture, are hard to deal with in the geosciences as standard statistical methods are often inappropriate to analyse this type of data. Especially in sensitivity analysis, the closed character of the data is often ignored. To that end, we developed a method to assess the local sensitivity of a model output with resect to a compositional model input. We adapted the finite difference technique such that the different parts of the input are perturbed simultaneously while the closed character of the data is preserved. This method was applied to a hydrologic model and the sensitivity of the simulated soil moisture content to local changes in soil texture was assessed. Based on a high number of model runs, in which the soil texture was varied across the entire texture triangle, we identified zones of high sensitivity in the texture triangle. In such zones, the model output uncertainty induced by the discrepancy between the scale of measurement and the scale of model application, is advised to be reduced through additional data collection. Furthermore, the sensitivity analysis provided more insight into the hydrologic model behaviour as it revealed how the model sensitivity is related to the shape of the soil moisture retention curve.
Keywords
SIMULATION-MODELS, UNCERTAINTY, ORGANIC-MATTER, CONTAMINANT TRANSPORT, ENERGY-BALANCE PROCESSES, PERTURBATION, SCALE, ATMOSPHERE TRANSFER SCHEME, PEDO-TRANSFER FUNCTIONS, SPATIALLY-VARIABLE WATER

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Chicago
Loosvelt, Lien, Hilde Vernieuwe, Valentijn Pauwels, Bernard De Baets, and Niko Verhoest. 2013. “Local Sensitivity Analysis for Compositional Data with Application to Soil Texture in Hydrologic Modelling.” Hydrology and Earth System Sciences 17 (2): 461–478.
APA
Loosvelt, L., Vernieuwe, H., Pauwels, V., De Baets, B., & Verhoest, N. (2013). Local sensitivity analysis for compositional data with application to soil texture in hydrologic modelling. HYDROLOGY AND EARTH SYSTEM SCIENCES, 17(2), 461–478.
Vancouver
1.
Loosvelt L, Vernieuwe H, Pauwels V, De Baets B, Verhoest N. Local sensitivity analysis for compositional data with application to soil texture in hydrologic modelling. HYDROLOGY AND EARTH SYSTEM SCIENCES. 2013;17(2):461–78.
MLA
Loosvelt, Lien, Hilde Vernieuwe, Valentijn Pauwels, et al. “Local Sensitivity Analysis for Compositional Data with Application to Soil Texture in Hydrologic Modelling.” HYDROLOGY AND EARTH SYSTEM SCIENCES 17.2 (2013): 461–478. Print.
@article{3219879,
  abstract     = {Compositional data, such as soil texture, are hard to deal with in the geosciences as standard statistical methods are often inappropriate to analyse this type of data. Especially in sensitivity analysis, the closed character of the data is often ignored. To that end, we developed a method to assess the local sensitivity of a model output with resect to a compositional model input. We adapted the finite difference technique such that the different parts of the input are perturbed simultaneously while the closed character of the data is preserved. This method was applied to a hydrologic model and the sensitivity of the simulated soil moisture content to local changes in soil texture was assessed. Based on a high number of model runs, in which the soil texture was varied across the entire texture triangle, we identified zones of high sensitivity in the texture triangle. In such zones, the model output uncertainty induced by the discrepancy between the scale of measurement and the scale of model application, is advised to be reduced through additional data collection. Furthermore, the sensitivity analysis provided more insight into the hydrologic model behaviour as it revealed how the model sensitivity is related to the shape of the soil moisture retention curve.},
  author       = {Loosvelt, Lien and Vernieuwe, Hilde and Pauwels, Valentijn and De Baets, Bernard and Verhoest, Niko},
  issn         = {1027-5606},
  journal      = {HYDROLOGY AND EARTH SYSTEM SCIENCES},
  language     = {eng},
  number       = {2},
  pages        = {461--478},
  title        = {Local sensitivity analysis for compositional data with application to soil texture in hydrologic modelling},
  url          = {http://dx.doi.org/10.5194/hess-17-461-2013},
  volume       = {17},
  year         = {2013},
}

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