Sensitivity Analysis of Surface Runoff Generation for Pluvial Urban Flooding




Significant advances have been made in recent times in the domain of integrated hydraulicmodelling of urban flooding. Development of a physically based model for dual drainageconcept, in which urban surface is treated as a network of open channels and ponds (majorsystem) connected to the sewer network (minor system), has been a step forward (Boonyaaroonnetet al. 2006). However, generation of reasonably realistic surface network is the mainconcern in this methodology (Djordjevic et al. 2005).This paper presents the results obtained by new developed tools (Boonya-aroonnet et al.2007) for enhancing the potential of 1D/1D modelling by more accurate GIS-based automaticgeneration of surface network features. The application of these tools to a real life case studyis discussed.

Simplification of high resolution of LiDAR Digital Terrain Model (DTM) by re-samplingoriginal 1x1m grid to larger sizes is necessary and sensitivity is analysed. Number of pondsremoved and cumulative and discrete volume loss charts were generated and used todetermine the suitable threshold values for removal of small ponds.In generating the pathways cross-section geometry, multi-criteria optimization technique wasdeployed to study the sensitivity of the input parameters on the geometries generated andappropriate parameter selection process.

O.J. Adeyemo, C. Maksimovic, S. Booyan-Aronnet, J. Leitao, D. Butler, C. Makropoulos

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