JUCS - Journal of Universal Computer Science 12(6): 608-626, doi: 10.3217/jucs-012-06-0608
Sequential Data Assimilation: Information Fusion of a Numerical Simulation and Large Scale Observation Data
Kazuyuki Nakamura‡, Tomoyuki Higuchi§, Naoki Hirose|‡ The Graduate University for Advanced Studies, JST CREST, Japan§ The Institute of Statistical Mathematics, JST CREST, Japan| Kyushu University, Japan
Corresponding author: Kazuyuki Nakamura ( nakakazu@ism.ac.jp ) © Kazuyuki Nakamura, Tomoyuki Higuchi, Naoki Hirose. This article is freely available under the J.UCS Open Content License. Citation:
Nakamura K, Higuchi T, Hirose N (2006) Sequential Data Assimilation: Information Fusion of a Numerical Simulation and Large Scale Observation Data. JUCS - Journal of Universal Computer Science 12(6): 608-626. https://doi.org/10.3217/jucs-012-06-0608 |  |
Abstract
Data assimilation is a method of combining an imperfect simulation model and a number of incomplete observation data. Sequential data assimilation is a data assimilation in which simulation variables are corrected at every time step of observation. The ensemble Kalman filter is developed for a sequential data assimilation and frequently used in geophysics. On the other hand, the particle filter developed and used in statistics is similar in view of ensemble-based method, but it has different properties. In this paper, these two ensemble based filters are compared and characterized through matrix representation. An application of sequential data assimilation to tsunami simulation model with a numerical experiment is also shown. The particle filter is employed for this application. An erroneous bottom topography is corrected in the numerical experiment, which demonstrates that the particle filter is useful tool as the sequential data assimilation method.
Keywords
particle filter, simulation science, data fusion