Dam breach simulations with multiple breach locations under wind and wave actions |
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| Authors: | Zhengang Wang David S Bowles |
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| Institution: | Utah Water Research Laboratory and Department of Civil and Environmental Engineering, College of Engineering, Utah State University, 8200 Old Main Hill, Logan, UT 84322-8200, USA |
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| Abstract: | Multiple breaches of a dam resulting from wind-generated waves and wave overtopping are studied for a hypothetical long non-cohesive earthen dam with an uneven crest. Both wind speed and direction affect breach locations and outflow for a particular reservoir surface geometry. Locations on the dam with longer fetches along the wind direction are more subject to wave overtopping and breaching than other locations. Higher wind speeds lead to wave overtopping and dam breaches under larger freeboards than lower wind speeds. For a specified inflow hydrograph and spillway configuration, there exists a location at which the smallest estimated peak outflow occurs among all possible breach locations and the pool drops too quickly for additional breaches to develop. Using this location for a fuse plug or a pilot channel could minimize downstream impact, perhaps as an interim or emergency measure for a dam with inadequate spillway capacity. |
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| Keywords: | Dam breach model Multiple breach locations Uneven dam crest Erosion Breach formation Wind-generated waves Wave overtopping |
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