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| Content Provider | Springer Nature Link |
|---|---|
| Author | Tolkova, Elena |
| Copyright Year | 2016 |
| 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 co-propagating tidal wave defines the background current and thereby friction experienced by the tsunami. |
| Starting Page | 389 |
| Ending Page | 409 |
| Page Count | 21 |
| File Format | |
| ISSN | 00334553 |
| Journal | Pure and applied geophysics |
| Volume Number | 173 |
| Issue Number | 2 |
| e-ISSN | 14209136 |
| Language | English |
| Publisher | Springer International Publishing |
| Publisher Date | 2015-12-29 |
| Publisher Place | Cham |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | River tsunami tide shallow-water equations water level measurements tide–tsunami interaction Geophysics/Geodesy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Geochemistry and Petrology Geophysics |
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