Abstract
Raindrop impact causes soil erosion and the transfer of solutes into surface runoff, leading to soil solute loss and water pollution. Accurately modelling this process in complex agricultural environments is challenging. A new prediction model was applied to illustrate mechanisms of soil solute transfer into surface runoff, addressing the underestimation of solute concentration in surface runoff but limited by uncertain model parameters. Two laboratory experiments were conducted, studying solute loss from soil to surface runoff under initially saturated and unsaturated soil conditions. An elasticity sensitivity analysis was used to identify crucial parameters. To improve prediction results, the ensemble Kalman filter (EnKF) method was coupled with the model during the early stage of the simulation, assimilating observed solute concentrations in surface runoff to update model parameters. After the early stage, the model generated predicted solute concentrations in surface runoff without the observed data until the simulation ended. Four model parameters, including incomplete mixing parameters α and γ, soil mixing layer depth hmix,t(t), and moving rate of the soil mixing layer front imix, were updated. The inflation method was used to prevent filter divergence caused by the EnKF. The simulation results showed that the EnKF significantly improved the model's prediction accuracy, even when applied during specific periods throughout the simulation. Updating α, γ, hmix,t(t) and imix resulted in better predictions compared to updating only α, γ and imix. This further demonstrated that the hmix,t(t) must be updated using the EnKF.
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This work was supported by the National Natural Science Foundation of China (Grant 42072271).
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YG: Methodology, writing—original draft preparation, formal analysis, validation, and software. JT: Conceptualization, methodology, experiments, investigation, formal analysis, resources, data curation, and writing—reviewing and editing.
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Gu, Y., Tong, J. Comparison of ensemble Kalman filter application to a prediction model of soil solute transfer into surface runoff by updating different parameters. Stoch Environ Res Risk Assess 37, 3261–3273 (2023). https://doi.org/10.1007/s00477-023-02448-7
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DOI: https://doi.org/10.1007/s00477-023-02448-7