Influence of hydropower outflow characteristics on riverbank stability: case of the lower Osage River (Missouri,USA) |
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Authors: | Wesam Mohammed-Ali Cesar Mendoza Robert R. Holmes Jr. |
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Affiliation: | 1. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology , Rolla, Missouri, USA;2. Department of Environmental Engineering, Tikrit University , Tikrit, Iraq wsm27f@mst.edu https://orcid.org/0000-0002-1279-3437;4. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology , Rolla, Missouri, USA https://orcid.org/0000-0002-2231-9042;5. Branch of Hydrodynamics, U.S. Geological Survey , Rolla, Missouri, USA https://orcid.org/0000-0002-5060-3999 |
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Abstract: | ABSTRACT This research examined the influences of outflow characteristics affecting riverbank stability. The 130-km stretch of the Lower Osage River downstream from Bagnell Dam (Missouri, USA) provided an excellent case study for this purpose. The integrated BSTEM model with the HEC-RAS model was accurately calibrated and validated with data from the US Geological Survey. Then, the outflow characteristics (peak flow duration, flow drawdown rate, and low flow duration) were investigated individually. The results of this study showed that: (1) riverbank stability is little affected by the duration time of the peak flow, especially on the reaches far from the dam; (2) sudden flow drawdown significantly reduces riverbank stability; however, the impact of the drawdown rate decreases with distance from the dam; and (3) the duration of the low flow after peak flow influences the riverbank stability value proportional to the distance from the dam. The time of low flow before failure increases as the distance from the dam increases. |
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Keywords: | peak flow riverbank stability flow drawdown low flow duration BSTEM HEC-RAS |
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