Global Sensitivity Analysis of Hydrogeological Parameters on the Local Gravity Effect of Groundwater in Saturated Layers
In order to analyze the sensitivity of hydrogeological parameters to the local groundwater gravity effect,a global sensitivity analysis of hydrogeological parameters was conducted based on a simple local hydrological model with analytical solutions,which simulated the virtual pumping test.The direct influence of each parameter on the simulated hydrogravity effect and the indirect influence of the coupling effect among parameters were quantitatively studied.The Sobol method was used to conduct the global sensitivity analysis of hydrogeological parameters for the local saturated layer groundwater gravity effect under specific hydrological scenarios.The results showed that:1)In the case study,the storage coefficient had the greatest impact on the local saturated layer groundwater gravity effect,followed by the permeability,and the distance between the instrument and the initial water level had the least impact.The interactive sensitivity among parameters was low,and the"dif-ferent parameters,same effect"phenomenon was weak.2)The selection of the parameter variation range should be based on the actual situation and an appropriate range should be chosen.The im-proper selection of the variation range had a great impact on the sensitivity analysis.3)Different sample sizes were selected for the analysis,when the samples had reached a certain number,the in-crease of the sample size had no significant impact on the results of the global sensitivity analysis,so the appropriate sample size should be selected to improve the work efficiency.The research results are provided for the subsequent selection of gravity-sensitive parameter groups,the multi-parameter inversion of hydrogeology based on the synthetic gravity observation constraints,and the simulation of the inversion results of different parameter combinations.
global sensitivity analysissobol methodgroundwater gravity effecthydrogeological pa-rameterslocal saturated layer
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