A Multilayered Approach to Two-Dimensional Urban Flood Modelling

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A Multilayered Approach to Two-Dimensional Urban Flood Modelling

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dc.contributor.author Evans, Barry en_GB
dc.date.accessioned 2010-12-16T12:19:38Z en_GB
dc.date.accessioned 2011-01-25T17:24:44Z en_US
dc.date.accessioned 2013-03-21T11:45:47Z
dc.date.issued 2010-06-25 en_GB
dc.description.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. en_GB
dc.description.sponsorship 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. en_GB
dc.identifier.uri http://hdl.handle.net/10036/117891 en_GB
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.rights.embargoreason To allow publication of the research en_GB
dc.subject Multilayer en_GB
dc.subject Modelling en_GB
dc.subject GIS en_GB
dc.subject Urban Flood Modelling en_GB
dc.title A Multilayered Approach to Two-Dimensional Urban Flood Modelling en_GB
dc.type Thesis or dissertation en_GB
dc.date.available 2012-06-30T04:00:06Z en_US
dc.date.available 2013-03-21T11:45:47Z
dc.contributor.advisor Djordjevic, Slobodan en_GB
dc.contributor.advisor Savic, Dragan en_GB
dc.publisher.department College of Engineering, Mathematics, and Physical Sciences en_GB
dc.type.degreetitle PhD in Engineering en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB


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