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

Linked Author(s): Soumendra Nath Kuiry

Keywords: Urban flood Fluvial flood Shadow zone Particle Image Velocimetry PIVlab

Abstract: Encroachments, further haphazard, and unplanned urbanization have altered the natural flood control mechanisms of the floodplains of natural streams and rivers. The scenario has been identified in many of the riverine environments globally, leading 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 streamlines and velocity vector maps. Results exhibit increasing 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 for deeper understanding of the phenomena.

DOI:

Year: 2025