An evaluation of onshore digital elevation models for modeling tsunami inundation zones
| Autor: | Widjo Kongko, Jakir Hossen, Hamzah Latief, Supriyati Upi, Sven Harig, Nicola Maher, Jonathan Griffin, Raditya Hanung, Natalja Rakowsky, Annika Fuchs, Aditia Rojali, Nick Horspool, Phil R. Cummins, Dewanto Edi |
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| Rok vydání: | 2015 |
| Předmět: |
Tsunami inundation
010504 meteorology & atmospheric sciences Elevation Terrain Shuttle Radar Topography Mission 010502 geochemistry & geophysics 01 natural sciences Advanced Spaceborne Thermal Emission and Reflection Radiometer Lidar Interferometric synthetic aperture radar General Earth and Planetary Sciences Earth Science SRTM Digital elevation model lcsh:Q 14. Life underwater IfSAR lcsh:Science Scale (map) SRTM-derived DEM lidar Geology 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | Frontiers in Earth Science, Vol 3 (2015) EPIC3Frontieres in Earth Science, Frontiers, 3(32) |
| ISSN: | 2296-6463 |
| Popis: | A sensitivity study is undertaken to assess the utility of different onshore digital elevation models (DEM) for simulating the extent of tsunami inundation using case studies from two locations in Indonesia. We compare airborne IFSAR, ASTER and SRTM against high resolution LiDAR and stereo-camera data in locations with different coastal morphologies. Tsunami inundation extents modelled with airborne IFSAR DEMs are comparable with those modelled with the higher resolution datasets and are also consistent with historical run-up data, where available. Large vertical errors and poor resolution of the coastline in the ASTER and SRTM elevation datasets cause the modelled inundation extent to be much less compared with the other datasets and observations. Therefore ASTER and SRTM should not be used to underpin tsunami inundation models. a model mesh resolution of 25 m was sufficient for estimating the inundated area when using elevation data with high vertical accuracy in the case studies presented here. Differences in modelled inundation between digital terrain models (DTM) and digital surface models (DSM) for LiDAR and IFSAR are greater than differences between the two data types. Models using DTM may overestimate inundation while those using DSM may underestimate inundation when a constant Manning’s roughness value is used. We recommend using DTM for modelling tsunami inundation extent with further work needed to resolve the scale at which surface roughness should be parameterised. |
| Databáze: | OpenAIRE |
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