Author(s): R. Reshma; Soumendra Nath Kuiry

Linked Author(s):

Keywords: Urban flood; Fluvial flood; Particle Image Velocimetry; PIVlab; Shadow zones

Abstract: Encroachments and haphazard urbanization have altered the natural flood control mechanisms of the floodplains of rivers and streams. The scenario has been identified in many riverine environments globally, making these urban centers more prone to frequent fluvial flood events. The shifting climate change patterns add complexity to the phenomenon. Real-time flood data is, however, scarce to gain a deeper understanding of fluvial flood dynamics over urban domains. This research work hence focuses on the experimental evaluation of fluvial flood dynamics amidst an urban built-up layout in a laboratory setup. Flow depth at different gauge points was recorded using ultrasonic water level sensors. Spatial variation of surface velocity was extracted using Particle Image Velocimetry (PIV) analysis. Flood flow patterns around the buildings and shadow zones were identified with the help of the streamline maps. Results exhibit an increase in complexity with increased flood discharge. Besides, the formation of vortices was identified in the narrow flow paths and near obstructions. Further numerical assessment of the experimental data needs to be performed to gain a deeper understanding of the phenomena.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1789-cd

Year: 2025