Using an Ensemble Kalman Filter Method to Calibrate Parameters and Update Soluble Chemical Transfer From Soil to Surface Runoff |
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Authors: | Ju-Xiu Tong Bill X Hu Jin-Zhong Yang |
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Institution: | (1) Cold and Arid Regions Environmental and Engineering Research Institute, CAS, 730000 Lanzhou, China;(2) Department of Geological Sciences, Florida State University, Tallahassee, FL 32306, USA;(3) Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA; |
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Abstract: | A data assimilation method, an ensemble Kalman filter (EnKF), is applied to simultaneously calibrate parameters and update
prediction for soluble chemical transfer from soil into surface runoff. The soluble chemical transfer is calculated using
a two-layer analytical model with constant parameters, h
mix (water depth of the soil-mixing layer), α and γ (surface runoff and infiltration-related incomplete mixing parameters). The model is presented as the forward model. Based
on laboratory experimental results, the measured chemical concentrations in the surface runoff are assimilated into the calculation
through the developed EnKF method to calibrate the parameters and update chemical concentration in the runoff. In comparison
with the calculation without data assimilation method, the updated solute concentration results are much closer to the experimental
observed data and the calibrated parameters, h
mix, α and γ, are no longer constants, but time dependent, which are physically reasonable. The study results indicate that the EnKF method
significantly improves the prediction for solute chemical transfer from soil into surface runoff, whereas the extended Kalman
filter will not, and the ensemble size of 100 will be suitable for the chemical concentration calculation based on our trial. |
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Keywords: | |
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