Print Email Facebook Twitter Spatial flood extent modelling. A performance based comparison Title Spatial flood extent modelling. A performance based comparison Author Werner, M.G.F. Contributor Savenije, H.H.G. (promotor) Bogaerts, M.J.M. (promotor) Faculty Civil Engineering and Geosciences Date 2004-12-14 Abstract The rapid development of Geographical Information Systems (GIS) has together with the inherent spatial nature of hydrological modelling led to an equally rapid development in the integration between GIS and hydrological models. The advantages of integration are particularly apparent in flood extent modelling. In this thesis, the integration of hydrological models and GIS is approached on the basis of performance, with performance taken as the balance of computational efficiency, flexibility of application, and most importantly the reliability of the integrated model. It is shown that predictive reliability is dominated by model uncertainties, particularly in model roughness parameters. These roughness parameters are found to be more conceptual than physical as they represent bulk momentum loss parameters at the reach scale. Limited data on spatial extent of flooding is available to constrain these uncertainties, and where such data is lacking the simplest numerical approach may be as reliable as more complex approaches. The overall performance of the simple approach is then higher as this is more easily integrated within GIS. Observations of flood extent from aerial photographs may help constrain uncertainties, though much more value is found from distributed water level observations in the floodplain. The lack of hydrological data also results in high resolution GIS data of elevation or land use being of limited value. As sufficient hydrological data is unavailable and perhaps impossible to acquire, model predictions made are recommended to be considered probabilistically, irrespective the level of integration with GIS. Subject flood extentgisuncertaintynumerical model To reference this document use: http://resolver.tudelft.nl/uuid:a6079396-5a1d-4a14-a08e-75fb6e2de480 Publisher Delft University Press ISBN 90-407-2558-6 Part of collection Institutional Repository Document type doctoral thesis Rights (c) 2004 M.G.F. Werner Files PDF ceg_werner_20041214.pdf 5.34 MB Close viewer /islandora/object/uuid:a6079396-5a1d-4a14-a08e-75fb6e2de480/datastream/OBJ/view