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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 5
Nat. Hazards Earth Syst. Sci., 15, 1011–1023, 2015
https://doi.org/10.5194/nhess-15-1011-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Monitoring and modelling to guide coastal adaptation to extreme...

Nat. Hazards Earth Syst. Sci., 15, 1011–1023, 2015
https://doi.org/10.5194/nhess-15-1011-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 May 2015

Research article | 21 May 2015

Representing hydrodynamically important blocking features in coastal or riverine lidar topography

B. R. Hodges B. R. Hodges
  • Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, Austin, USA

Abstract. 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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Many of the features that either block or channelize flooding are too narrow to represent in conventional hydrodynamic (water flow) models, which must work at wider grid scales. New methods have been developed for identifying important features and representing their effects on blocking or controlling flooding. These methods are automated so that a fine-resolution lidar digital terrain model can be easily processed to a coarser resolution while retaining narrow blocking features.
Many of the features that either block or channelize flooding are too narrow to represent in...
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