Simulation of Dam-Breach Outflow Hydrographs Using Water Level Variations

Khil-Ha Lee ()
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Khil-Ha Lee: Daegu University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2019, vol. 33, issue 11, No 7, 3797 pages

Abstract: Abstract Most parametric models of earthen dam failure require a breach progression curve to establish an outflow hydrograph, but well-documented breach progression data obtained during dam failure are rarely available. As an alternative, the potential for developing outflow hydrographs from observed variations in reservoir water level is explored. The parameter retrieval process is based on minimizing the difference between the model solution and the water level observations. The retrieved optimal parameters are used to build an outflow hydrograph, which is then linked with a routing model to identify the flood-prone areas downstream. The suggested approach is tested in a case study of a small reservoir and is validated with the inundation area recorded in an on-site investigation. The disparity between the simulated and recorded inundation areas is approximately 7~8%, and the difference in water depth is small at 0.03~0.09 m. Overall, the suggested approach provides reasonable accuracy for the test site.

Keywords: Breach progression; Dam breach; Natural hazard; Optimization (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1007/s11269-019-02341-5

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