Affiliation:
1. The University of Queensland, School of Civil Engineering, Brisbane, QLD 4072, Australia.
Abstract
When an undular bore propagates upstream against a subcritical flow in a flat channel, its leading front may weaken and vanish. The present study physically investigated the entire decaying process of vanishing bores in a relatively large facility. The invert was made of mobile or fixed natural river gravel. Detailed sampling of water surface elevations and velocities was performed in combination with high-resolution photos and video recordings. Despite some increased turbulence characteristics linked to the bore front arrival, no sediment motion was observed underneath the vanishing bores. The quantitative results provide a unique benchmark dataset for further study of later-stage bore propagations.
Publisher
Canadian Science Publishing
Subject
General Environmental Science,Civil and Structural Engineering