Abstract
For the sophistication of the tsunami load, future and historical tsunami scale evaluations, the dependency of the density of tsunami inundation water with sediment on the hydraulic quantities, and then the dependencies of the tsunami run-up distance, sediment deposit distance, mean sediment deposit thickness on the density of the tsunami inundation water are examined through a devised small-scale hydraulic experiment. Within the experimental range of this study, it is verified that the density of the tsunami inundation water depends on the Froude number of the incident tsunami inundation flow and the sediment grain size, and the relative tsunami run-up distance (= the run-up distance of the inundation water with sediment/the run-up distance of the inundation water without sediment (= fresh water)), ratio of the tsunami sediment deposit distance to the tsunami run-up distance, ratio of the mean tsunami sediment deposit thickness to the tsunami sediment deposit distance depend on the density of the tsunami inundation water, and four empirical expressions for those dependencies are proposed.
Highlights
The density ρ of tsunami inundation water with sediment would have influences on the tsunami horizontal and vertical forces linearly as inferred from the expressions such as the hydrostatic pressure and momentum theorem, the thickness and extent of tsunami sediment deposit (Matsutomi et al 2017), etc.In the evaluation of the tsunami load even on the land structures including RC buildings (AIJ 2015), the density of tsunami inundation water has been treated as a fixed value of 1.03 g/cm3 so far
There is no fixed view on the maximum density of the vertical cross section average of inundation water with sediment even in the case of river flood that is more frequent than tsunami
In the light of the above circumstances, this study aims to examine the dependency of the density ρ of the tsunami inundation water on hydraulic quantities such as the Froude number Fri of incident tsunami inundation flow, and the dependencies of the tsunami run-up distance LR, sediment deposit distance LRS, mean sediment deposit thickness Z on the density ρ of the tsunami inundation water through a devised small-scale hydraulic experiment for the sophistication of the tsunami load, future and historical tsunami scale evaluations
Summary
In the evaluation of the tsunami load even on the land structures including RC buildings (AIJ 2015), the density of tsunami inundation water has been treated as a fixed value of 1.03 g/cm so far. In the light of the above circumstances, this study aims to examine the dependency of the density ρ of the tsunami inundation water on hydraulic quantities such as the Froude number Fri of incident tsunami inundation flow, and the dependencies of the tsunami run-up distance LR, sediment deposit distance LRS, mean sediment deposit thickness Z on the density ρ of the tsunami inundation water through a devised small-scale hydraulic experiment for the sophistication of the tsunami load, future and historical tsunami scale evaluations
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