Abstract
An extensive data set of water level measurements of the September 2015 Chilean tsunami in rivers in Japan and a new methodology for data processing are used to verify that tsunami dissipation in a river at each instant and locality depends on the tidally-modified wave-locked slope of the river surface. As deduced from the observations, a relatively small tsunami or ocean noise traveling at mild wave-locked slopes can propagate virtually without losses to the upstream locations where observed tidal ranges are a fraction of that downstream; though at the higher slopes, tidal and riverine currents combined efficiently damp the shorter waves. The observed correlations between the tsunami admittance upriver and the traveled wave-locked slopes are explained analytically under the fully non-linear shallow-water approximation. It is found that the wave-locked slope in a purely incident wave relates to the bottom drag in the same manner as a steady surface slope does for a stationary flow. For a small-amplitude tsunami in the study rivers, the wave-locked slope in a copropagating tidal wave defines the background current and thereby friction experienced by the tsunami.
This paper is part of the article collection on ‘‘Illapel, Chile, Earthquake on September 16th, 2015’’.
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Acknowledgments
The water level data in rivers in Japan and the gauging station information were obtained from the hydrology database of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of Japan.
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Tolkova, E. (2017). Tsunami Penetration in Tidal Rivers, with Observations of the Chile 2015 Tsunami in Rivers in Japan. In: Braitenberg, C., Rabinovich, A. (eds) The Chile-2015 (Illapel) Earthquake and Tsunami. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-57822-4_22
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DOI: https://doi.org/10.1007/978-3-319-57822-4_22
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