State and Parameter estimation; Variational filter; Particle filter; Extended Kalman filter; Nonlinear Environmental System; Leaf area index; Soil moisture
Abstract :
[en] An environmental dynamic system is usually modeled as a nonlinear system described by a set of nonlinear ODEs. A central challenge in computational modeling of environmental systems is the determination of the model parameters. In these cases, estimating these variables or parameters from other easily obtained measurements can be extremely useful. This work addresses the problem of monitoring and modeling a leaf area index and soil moisture model (LSM) using state estimation. The performances of various conventional and state-of-the-art state estimation techniques are compared when they are utilized to achieve this objective. These techniques include the extended Kalman filter (EKF), the particle filter (PF), and the more recently developed technique variational filter (VF). Specifically, two comparative studies are performed. In the first comparative study, the state variables (the leaf-area index LAI , the volumetric water content of the soil layer 1, HUR1 and the volumetric water content of the soil layer 2, HUR2) are estimated from noisy measurements of these variables, and the various estimation techniques are compared by computing the estimation root mean square error (RMSE) with respect to the noise-free data. In the second comparative study, the state variables as well as the model parameters are simultaneously estimated. In this case, in addition to comparing the performances of the various state estimation techniques, the effect of number of estimated model parameters on the accuracy and convergence of these techniques are also assessed. The results of both comparative studies show that the PF provides a higher accuracy than the EKF, which is due to the limited ability of the EKF to handle highly nonlinear processes. The results also show that the VF provides a significant improvement over the PF because, unlike the PF which depends on the choice of sampling distribution used to estimate the posterior distribution, the VF yields an optimum choice of the sampling distribution, which also accounts for the observed data. The results of the second comparative study show that, for all techniques, estimating more model parameters affects the estimation accuracy as well as the convergence of the estimated states and parameters. However, the VF can still provide both convergence as well as accuracy related advantages over other estimation methods.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Mansouri, Majdi; Université de Liège - ULiège > Sciences et Technologies de l'Environnement > Mécanique et Construction
Dumont, Benjamin ; Université de Liège - ULiège > Sciences et Technologies de l'Environnement > Mécanique et construction
Destain, Marie-France ; Université de Liège - ULiège > Sciences et Technologies de l'Environnement > Mécanique et construction
Language :
English
Title :
Modeling and Prediction of Nonlinear Environmental System Using Bayesian Methods
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