Preprints
https://doi.org/10.5194/hess-2021-99
https://doi.org/10.5194/hess-2021-99

  07 Apr 2021

07 Apr 2021

Review status: a revised version of this preprint was accepted for the journal HESS.

Advanced sensitivity analysis of the impact of the temporal distribution and intensity in a rainfall event on hydrograph parameters in urban catchments: a case study

Francesco Fatone1, Bartosz Szelag2, Adam Kiczko3, Darek Majerek4, Monika Majewska2, Jakub Drewnowski5, and Grzegorz Łagód4 Francesco Fatone et al.
  • 1Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Polytechnic University of Marche Ancona, 60121 Ancona, Italy
  • 2Faculty of Environmental, Geomatic and Energy Engineering, Kielce University of Technology, 25-314 Kielce, Poland
  • 3Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences-SGGW, 02-797 Warsaw, Poland
  • 4Faculty of Fundamentals of Technology, Lublin University of Technology, 20-618 Lublin, Poland
  • 5Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland

Abstract. Knowledge of the variability of the hydrograph of outflow from urban catchments is highly important for measurements and evaluation of the operation of sewer networks. Currently, hydrodynamic models are most frequently used for hydrograph modeling. Since a large number of their parameters have to be identified, there may be problems at the calibration stage. Hence, the sensitivity analysis is used to limit the number of parameters. However, the current sensitivity analysis methods ignore the effect of the temporal distribution and intensity of precipitation in a rainfall event on the catchment outflow hydrograph. The article presents the methodology of construction of a simulator of catchment outflow hydrograph parameters (volume, maximum flow). For this purpose, uncertainty analysis results obtained with the use of the GLUE (Generalized Likelihood Uncertainty Estimation) method were used. An innovative sensitivity coefficient has been proposed to study the impact of the variability of hydrodynamic model parameters depending on rainfall distribution, rainfall genesis (in the Chomicz scale), and uncertainty of estimated simulator coefficients on the parameters of the outflow hydrograph. The results indicated a considerable influence of rainfall distribution and intensity on the sensitivity factors. The greater the intensity and temporal distribution of rainfall, the lower the impact of the identified hydrodynamic model parameters on the hydrograph parameters. Additionally, the calculations confirmed the significant impact of the uncertainty of the estimated coefficient in the simulator on the sensitivity coefficients, which has a significant effect on the interpretation of the relationships obtained. The approach presented in the study can be widely applied at the model calibration stage and for appropriate selection of hydrographs for identification and validation of model parameters.

Francesco Fatone et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-99', Anonymous Referee #1, 04 Jun 2021
    • AC1: 'Reply on RC1', bartosz szeląg, 04 Sep 2021
  • RC2: 'Comment on hess-2021-99', Anonymous Referee #2, 25 Jun 2021
    • AC2: 'Reply on RC2', bartosz szeląg, 04 Sep 2021

Francesco Fatone et al.

Francesco Fatone et al.

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Short summary
The sensitivity analysis based on a simulator of hydrograph parameters (volume, maximum flow) is shown. The method allows to analyze the impact of calibrated hydrodynamic model parameters, including rainfall distribution and intensity, on the hydrograph. A sensitivity coefficient and the effect of the simulator uncertainty on calculation results are presented. This approach can be used to select hydrographs for calibration and validation of models, which has not been taken into account so far.