津波シミュレーションモデルと潮位データの同化におけるモデリングと解析

抄録

We designed a new data assimilation approach for a tsunami simulation model andtide gauge records, and obtained corrected bottom topography of the Japan Sea. In this dataassimilation problem, the number of the We designed a new data assimilation approach for a tsunami simulation model and tide gauge records, and obtained corrected bottom topography of the Japan Sea. In this data assimilation problem, the number of the variables in the simulation model is very large, whereas observed data set is limited, which results in an ill-posed inversion problem. Therefore, some techniques are required in order to analyze the system, such as introducing appropriate prior informations to the system model. In this paper, we discuss the new approach for constructing the state space model of the tsunami simulation model and the tide gauge records. It is also discussed in view of the graphical model. We show the result of the numerical experiment for validation of the method. We also show the result of the analysis using the tide gauge records of Okushiri Tsunami.