Experimental Investigation of Flood Waves from Open-Channel Levee Breach
Levees are commonly encountered in various places of the world on open channels controlling high flows and protecting surrounding areas from inundation. For several reasons, such as soil erosion and catastrophic high floods, levees are subject to being breached at several locations. Unsteady flow resulting from levee breach is inherently three dimensional in character and similar in some aspects to dividing flows in open channel and in other aspects to dam break flow. In the current work, flow characteristics in a rectangular open channel levee breach are experimentally collected while treating flow as 3D. Depth measurements are made using point gauges and velocity measurements are obtained using a Sontec ADV over grids defined throughout the levee breach region. Various discharges and area ratios for levee breach configuration are run experimentally. Hydraulic characteristics of secondary flows developed in levee breach in an open channel breach region and outside open channel are presented, which are vital for breach opening and breach area stability in case of erodible channel bed and sides. One of the fastest and most efficient methods for breach closure is to use sand bags. The current work is extended to testing various sizes and shapes of sand bags for breach closure and flow characteristics at incipient motion for bags are collected and analyzed.
KeywordsMain Channel Separation Zone Stagnation Zone Acoustic Doppler Velocimeter Incipient Motion
This work has been carried out under the financial support of Egyptian Science and Technology Development Fund (STDF), Egyptian State Ministry for Scientific Research, Project ID39.
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