On the accuracy requirement of surrogate models for adequate global sensitivity analysis of urban low-impact development model

IF 5.9 1区 地球科学 Q1 ENGINEERING, CIVIL Journal of Hydrology Pub Date : 2025-03-15 DOI:10.1016/j.jhydrol.2025.133102
Ke Yi , Pan Yang , Siyuan Yang , Shenxu Bao , Zhihao Xu , Qian Tan
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Abstract

Global sensitivity analysis (GSA) is crucial for understanding, simplifying, and applying high fidelity process-based (Hifi) hydrological models. Its application has been hindered by the extensive model evaluations needed for convergence and the associated computational cost. Surrogate models (SMs) can significantly reduce the computational burden of GSA, but its approximation errors can introduce usually uninvestigated GSA errors. We address this gap by investigating SMs-induced GSA error in parameter screening, sensitivity ranking, and sensitivity index valuation. By comparing the converged GSA results from a support vector regression surrogate model (SVR-SM) and the storm water management model (SWMM) in simulating the hydrological response of a small urban watershed to changes in low-impact development (LID) parameters, this study finds that SMs-induced GSA errors increase with higher SMs approximation errors. The relationship between SMs-induced GSA error and SMs approximation error (measured by R2) is consistent across various flow metrics and rainfall intensities. SMs can adequately reproduce the converged GSA results of a Hifi SWMM with only one-thousandth of the original computation time. However, SMs-induced GSA errors may become unacceptable if the R2 of SVR-SMs is below 0.96. Our findings highlight the importance of surrogate models’ accuracy in GSA and provide valuable guidance for future GSA applications.
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来源期刊
Journal of Hydrology
Journal of Hydrology 地学-地球科学综合
CiteScore
11.00
自引率
12.50%
发文量
1309
审稿时长
7.5 months
期刊介绍: The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.
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