Abstract
Data assimilation is one of estimation method which combining a mathematical modeling and measurement data. Data assimilation need less measurement data and easy adapt to external influenced. Here, we present the application of Data assimilation to estimate the variable in environmental problem such as groundwater pollution concentration and air pollution concentration and debris flow distribution. One of data assimilation method is Kalman Filter. Some application of Kalman filter and its modification has been done to get more accurate estimation with less computation time. We used some modification of Kalman filter to solve environmental problem.
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