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| Titel |
Tsunami inundation modelling based on detailed roughness maps of densely populated areas |
| VerfasserIn |
G. Gayer, S. Leschka, I. Nöhren, O. Larsen, H. Günther |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 8 ; Nr. 10, no. 8 (2010-08-03), S.1679-1687 |
| Datensatznummer |
250008344
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1679-2010.pdf |
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| Zusammenfassung |
An important part within the German-Indonesian Tsunami Early Warning System
(GITEWS) project was the detailed numerical investigation of the impact of
tsunamis in densely populated coastal areas of Indonesia. This work, carried
out by the German Research Centre Geesthacht (GKSS), in co-operation with
DHI-WASY, also provides the basis for the preparation of high resolution
hazard and risk maps by the German Aerospace Center (DLR).
In this paper a method is described of how to prepare very detailed roughness
maps for scenario computations performed with the MIKE 21 Flow Model FM in
three highly resolved (~10 m) priority regions, namely Kuta (Bali),
Padang (West-Sumatra), and Cilacap (southern coast of Java). Roughness values
are assigned to 43 land use classes, e.g. different types of buildings,
rural and urban sub-areas, by using equivalent coefficients found in
literature or by performing numerical experiments.
Comparisons of simulations using differentiated roughness maps with
simulations using constant values (a widely used approach) are presented and
it is demonstrated that roughness takes considerable influence on run-up and
inundation.
Out of all simulations, the results of the worst case scenarios for each of
the three priority areas are discussed. Earthquakes with magnitudes of
MW=8.5 or higher lead to considerable inundation in all study
sites. A spatially distinguished consideration of roughness has been found to
be necessary for detailed modelling onshore. |
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