LI Mei-shui,YANG Xiao-hua.Global Sensitivity Analysis of SWMM Parameters Based on Sobol Method[J].China Water & Wastewater,2020,36(17 17):95-102.
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Global Sensitivity Analysis of SWMM Parameters Based on Sobol Method

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 17 17 Page: 95-102 Column: Date of publication: 2020-09-01
Author(s):
LI Mei-shui; YANG Xiao-hua
(State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China)
Keywords:
SWMM; global sensitivity; Sobol method; water quantity and quality simulation parameter
Abstract:
Global sensitivity of SWMM model parameters (water quantity and quality) in Beijing Normal University campus was analyzed through a self-developed SWMM-UQ (Storm Water Management Model-Uncertainty Quantification)Module. For simulation parameters of water quantity, the ratio of impervious area of subcatchment (Pct-Imperv), the width coefficient of subcatchment (K-Width) and the Manning coefficient of the conduit (Manning-N) showed significant sensitivity to the simulation results (objective function). These parameters played a decisive role in the process of rainfall and runoff of the study area, and they were the key parameters of the model for water quantity simulation. For the water quality simulation parameters, only the maximum buildup amount (R_MaxBulidup), the wash-off coefficient (R_WashoffCoef) and the washoff exponent (R_WashoffExp) of the road were significantly sensitive to the simulation results, and the rest were not sensitive, indicating that the type of landuse had a greater impact on the sensitivity of water quality simulation parameters. Whether it was water quantity or water quality simulation parameters, the interaction of parameters affected the change of model results to a greater extent compared with the single action of parameters.
Last Update: 2020-09-01