2024 Volume 80 Issue 17 Article ID: 24-17229
To study the conditions of the characteristics of the sampling region under which tsunamis carry large amount of silty sediment, we referred the results of the previous survey. The relationship between the fine fraction content and indexes representing the characteristics of the sampling region were evaluated. The population density, enclosed index and river distance were selected as the indexes to represent the characteristics of the sampling region. The enclosed index was also taken into account the effect of ports. Through a hierarchical cluster analysis, the sampling regions with high enclosed index or population density and close river distance were classified as clusters with relatively large fine fraction content. The model that uses selected indexes to estimate the fine fraction content was suggested. Bayesian linear regression reveals the causal relationship between the fine fraction content and the explanatory variables multiplied by population density and enclosed index. These results demonstrate that the enclosed index and population density can be utilized as the indexes for quantitatively identifying regions where tsunamis are likely to carry large amount of silty sediment.
