A Multilayered Approach to Two-Dimensional Urban Flood Modelling

DSpace/Manakin Repository

Open Research Exeter (ORE)

A Multilayered Approach to Two-Dimensional Urban Flood Modelling

Please use this identifier to cite or link to this item: http://hdl.handle.net/10036/117891


Title: A Multilayered Approach to Two-Dimensional Urban Flood Modelling
Author: Evans, Barry
Advisor: Djordjevic, SlobodanSavic, Dragan
Publisher: University of Exeter
Date Issued: 2010-06-25
URI: http://hdl.handle.net/10036/117891
Abstract: With urbanisation continuing to encroach upon flood plains, the constant replacement of permeable land with impermeable surfaces and with the changes in global climate, the need for improved flood modelling is ever more apparent. A wide range of methods exist that simulate surface flow; most commonly in one-dimensional (1D) or twodimensional (2D), and more recently on smaller scales in three-dimensional (3D) models. In urban flood modelling, 2D models are often the preferred choice as they can simulate surface flow more accurately than their 1D model counterparts; they are, however, more computationally demanding and thereby usually require greater simulation time. With the vast amount of information used in flood modelling, generalisation techniques are often employed to reduce the computational load within a simulation. The objective of this thesis is to improve 2D flood modelling in urban environments by introducing a new and novel approach of representing fine scale building features within coarse grids. This is achieved by creating an automated approach that data-mines key features such as buildings and represents their effects numerically within a multiple layer grid format. This new approach is tested in comparison to two other, already established generalising techniques which are single layer based. The effectiveness of each model is assessed by its ability to accurately represent surface flow at different grid resolutions and how each copes with varying building orientations and distributions within the test datasets. The performance of each generalising approach is determined therefore by its accuracy in relation to the fine scale model and the difference in the computational time required complete the simulation. Finally the multilayered methodology is applied to a real case scenario to test its applicability further. Overall it revealed, as predicted, that the multilayered approach enables far greater accuracies at routing surface flow within coarse grids whilst still greatly reducing computational time. As a further benefit in urban flood modelling, this thesis shows that using a multilayered data format it is possible to simulate the influence of features that have a grid resolution finer than the initial terrain topology data, thus enabling, for example, the routing of surface water through alleyways between buildings that have a width less than one meter.
Type: Thesis or dissertation
Keywords: MultilayerModellingGISUrban Flood Modelling
Funders/Sponsor: The work presented in this thesis was funded by Engineering and Physical Sciences Research Council (EPSRC) through the Flood Risk Management Research Consortium (FRMRC) and Doctoral Training Account (DTA). Additional funding for the research was given by the School of Engineering and Computer Sciences and Mathematics (SECaM) and the Centre for Water Systems (CWS) Platform Grant.

Please note: Before reusing this item please check the rights under which it has been made available. Some items are restricted to non-commercial use. Please cite the published version where applicable.

Files in this item

Files Size Format View
EvansB.pdf 11.52Mb PDF Thumbnail
EvansB_fm.pdf 136.1Kb PDF Thumbnail

This item appears in the following Collection(s)


My Account

Local Links