Modelling floods in urban areas and representation of buildings with a method based on adjusted conveyance and storage characteristics

Abstract

The present paper reviews several approaches that can be used in capturing urban features in coarse resolution two-dimensional (2D) models and it demonstrates the effectiveness of a new approach against the straightforward 2D modelling approach on a hypothetical and a real-life case study work.The case study work addresses the use of coarse grid resolutions in 2D non-inertia models. The 2D noninertia model used solves continuity and momentum equations over the cells of the coarse model while taking the minimum elevation as a surface level. The volume stored in every cell is calculated as a volume-depth relationship. In order to replicate restriction in conveyances in x-y directions of fine resolution models due to building blocks, the friction values of the coarse-resolution model are adjusted to match the results of the high-resolution model. The work presented in this paper shows the possibility of applying a 2D non-inertia model more effectively in urban flood modelling applications whilst still making use of the high resolution of topographic data that can nowadays be easily acquired.

Methodological Framework for Analysing Cascading Effects from Flood Events: The Case of Sukhumvit Area, Bangkok, Thailand

“…The use of numerical models is invaluable for the identification of flood-prone areas and quantification of hazards [43][44][45][46][47][48][49][50]. Although the use of numerical models is nowadays a standard practice for many flood specialists, the ability to produce reliable results still poses a considerable challenge to researchers and practitioners.…”

High Resolution Decision Maps for Urban Planning: A Combined Analysis of Urban Flooding and Thermal Stress Potential In Asia and Europe

“…The coupled 1D/2D models are invaluable for this purpose. However, there is a great body of literature which suggests that great care is needed in the data collection and processing as well as the need to use an appropriate numerical modelling technique [8][9][10][11][12][13][14][15][16]. The DEM resolution used in the Ayutthaya work was 20x20 m. The model and maps produced were used for communication with local stakeholders and selection of remedial and flood protection works [3].…”

Combining Ecosystem Services with Cost-Benefit Analysis for Selection of Green and Grey Infrastructure for Flood Protection in a Cultural Setting

“…Given the importance of temporal analysis, the use of one-and two-dimensional numerical hydrodynamic models has proved to be invaluable (e.g., [28][29][30]). However, there are numerous issues associated with data, models and mapping of results and so they require careful consideration (see, for example, [31][32][33][34][35][36][37][38][39][40][41][42]). …”