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| Titel |
Representing hydrodynamically important blocking features in coastal or riverine lidar topography |
| VerfasserIn |
B. R. Hodges |
| 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 Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2015-05-21), S.1011-1023 |
| Datensatznummer |
250119476
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1011-2015.pdf |
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| Zusammenfassung |
| New automated methods are developed for identifying narrow landscape features
that cause hydrodynamic blocking and might have critical impacts for
management models of river flooding, coastal inundation, climate change, or
extreme event analysis. Lidar data processed into a fine-resolution raster
(1 m × 1 m) can resolve narrow blocking features in topography
but typically cannot be directly used for hydrodynamic modeling. For
practical applications such data are abstracted to larger scales, which can
result in a loss of hydrodynamic blocking effects. The traditional approach
to resolving hydrodynamic blocking features is to represent them as cell
boundaries within a customized unstructured grid that is tuned to the spatial
features. A new automated edge-blocking approach is developed, which allows
application of an arbitrarily structured (Cartesian) mesh at coarser scales and
provides contiguous representation of blocking features along Cartesian cell
boundaries. This approach distorts the shape of a blocking feature (i.e.,
making it rectilinear along grid cell faces) but retains its critical
hydrodynamic blocking height characteristics and spatial continuity within
the topographic model. |
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