Enhanced DEM-based flow path delineation methods for urban flood modelling
نویسندگان
چکیده
منابع مشابه
Impact of Lidar Nominal Post-spacing on DEM Accuracy and Flood Zone Delineation
Lidar data have become a major source of digital terrain information for use in many applications including hydraulic modeling and flood plane mapping. Based on established relationships between sampling intensity and error, nominal post-spacing likely contributes significantly to the error budget. Post-spacing is also a major cost factor during lidar data collection. This research presents met...
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The surface runoff process in fluvial/pluvial flood modelling is often simulated employing a two-dimensional (2-D) diffusive wave approximation described by grid based digital elevation models (DEMs). However, this approach may cause potential problems when using the 2-D surface flow model which exchanges flows through adjacent cells, with conventional sink removal algorithms which also allow f...
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An increase of urban flood risks is expected for the following decades not only because climate is becoming more extreme, but also because population and asset densities in cities are increasing. There is a need for models that can explain the damage process of urban flooding and support damage prevention. Recent improvements in flood modeling have highlighted the importance of urban topography...
متن کاملThe Effect of Lidar Posting Density on Dem Accuracy and Flood Extent Delineation a Gis-simulation Approach
Recently a number of local communities and a few statewide agencies have undertaken efforts to acquire more accurate digital elevation surfaces for various applications including flood hazard mapping. The technology most widely adopted for this purpose has been LIDAR remote sensing. The acquisition of a spatially dense set of elevation postings representing the " bare " ground may be the greate...
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ژورنال
عنوان ژورنال: Journal of Hydroinformatics
سال: 2012
ISSN: 1464-7141,1465-1734
DOI: 10.2166/hydro.2012.275