Combining a 2-D Flood Plain Model with GIS for Flood Delineation and Damage Assessment

by P. Di Giammarco, Univ of Bologna, Bologna, Italy,
E. Todini, Univ of Bologna, Bologna, Italy,
David Consuegra, Univ of Bologna, Bologna, Italy,
F. Joerin, Univ of Bologna, Bologna, Italy,
F. Vitalini, Univ of Bologna, Bologna, Italy,

Document Type: Proceeding Paper

Part of: Modelling of Flood Propagation Over Initially Dry Areas


This paper describes potential applications of Geographical Information System (GIS) for flood hazard delineation and damage assessment. The hydraulic model simulates both 1-D flood routing in the main channels and 2-D propagation in the flood plain. The diffusive wave approximation is used in both cases. In the flood plain, shallow wave theory is assumed to apply. Equations are solved by means of an Integrated Finite Difference approach on the basis of polygonal cells known as Dirichlet tessellation. The latter is derived from a suitable Digital Terrain Model (DTM) constructed with a particular Triangular Irregular Network (TIN) accounting for structure and break lines. Flood mapping and damage assessment procedures for agricultural land, traffic conditions and built-up areas have been implemented in a GIS framework supported by the data base system, dBaseIV, the raster GIS, IDRISI and the vector oriented support, MapInfo. Migration to more sophisticated GIS platforms is envisaged in the framework of future applications.

Subject Headings: Two-dimensional models | Flood plains | Flood routing | Hydrologic models | Geographic information systems | Hydraulic models | Mathematical models | Terrain models

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