As for the estimation of sediment transport accompanied with tsunami, a numerical model considering the exchange sediment volume of the bed-load layer and suspended-sediment layer has been proposed. As for the Takahashi et al. (1999) model, properly setting of the saturation concentration as a parameter is considered one of the key issue, since this parameter may affect the calculation result. In this study, we compared the submarine topography changes calculated by two different models in extensive calculation domain under the condition that the saturation concentration was given as constant value, and showed that the aspect of topographic change greatly differs between both models. And also, we applied relational formula related to the saturation concentration proposed by Sugawara et al., 2014 and considered the spatial and temporal transition of this parameter. As a result, it is considered that the volume of suspended- sediment is estimated to be excessively large overall in this extensive calculation domain with the setting that the saturation concentration is given as constant value of 1%. In addition, it is also shown that it is difficult to determine the appropriate constant value applicable to the extensive calculation domain.
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