The influence of errors in Digital Terrain Models on flood flow routes

Sylvian Neelz, Gareth Pender

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    5 Citations (Scopus)

    Abstract

    The modelling of flood inundation patterns on rural and urban river floodplains is making increasing use of high-resolution and high-accuracy Digital Elevation Models (DEMs) based on LiDAR (airborne laser scanning) data. LiDAR measurements are reported to be subject to root mean square errors of 0.15 m vertically and 0.50 m horizontally. The aim of the paper is to investigate the implications of these uncertainties in terms of the reliability of model results, concentrating on the modelling of overland flood flow using a 2D fully hydrodynamic model. A flood event caused by overflow from a river is simulated using three different DEMs: a benchmark error-free DEM, and 2 "altered" DEMs with added LiDAR errors of different magnitudes. These altered DEMs are a less accurate representation of reality, and also have an artificial roughness that is typical of LiDAR-based DEMs used in practice. The main conclusions are that: (1) this artificial roughness can significantly slow down the flow in the simulation, resulting in an incorrect representation of the flow dynamics, and (2) the LiDAR errors can have a significant impact on the routes taken by the flow, and on modelled water levels and velocities. © 2006 Taylor & Francis Group.

    Original languageEnglish
    Title of host publicationProceedings of the International Conference on Fluvial Hydraulics - River Flow 2006
    Pages1955-1962
    Number of pages8
    Volume2
    Publication statusPublished - 2006
    EventInternational Conference on Fluvial Hydraulics - River Flow 2006 - Lisbon, Portugal
    Duration: 6 Sep 20068 Sep 2006

    Conference

    ConferenceInternational Conference on Fluvial Hydraulics - River Flow 2006
    CountryPortugal
    CityLisbon
    Period6/09/068/09/06

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