Can the discharge of a hyperconcentrated flow be estimated from paleoflood evidence?
| Autor: | Bodoque, JM, Eguíbar Galán, Miguel Ángel, Diez-Herrero, A, Gutierrez-Perez, I, Ruiz-Villanueva, V |
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| Jazyk: | Spanish; Castilian |
| Rok vydání: | 2011 |
| Předmět: |
INGENIERIA HIDRAULICA
Hydraulic property Momentum Iterative methods Hyperconcentrated flow Hydraulics Momentum equation Simplifying assumptions Anoxic sediments Numerical model Methodological approach Critical flow Hydrostatic pressure Water depth Cross section Hydrostatics Wetted perimeters Geomorphology Paleoflood Peak discharge Superelevation Energy efficiency Flood event Calibration Iterative process Specific energy Uncertainty analysis Water flow Hydraulic analysis Discharge Estimation method Reconstruction |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | Many flood events involving water and sediments have been characterized using classic hydraulics principles, assuming the existence of critical flow and many other simplifications. In this paper, hyperconcentrated flow discharge was evaluated by using paleoflood reconstructions (based on paleostage indicators [PSI]) combined with a detailed hydraulic analysis of the critical flow assumption. The exact location where this condition occurred was established by iteratively determining the corresponding cross section, so that specific energy is at a minimum. In addition, all of the factors and parameters involved in the process were assessed, especially those related to the momentum equation, existing shear stresses in the wetted perimeter, and nonhydrostatic and hydrostatic pressure distributions. The superelevation of the hyperconcentrated flow, due to the flow elevation curvature, was also estimated and calibrated with the PSI. The estimated peak discharge was established once the iterative process was unable to improve the fit between the simulated depth and the depth observed from the PSI. The methodological approach proposed here can be applied to other higher-gradient mountainous torrents with a similar geomorphic configuration to the one studied in this paper. Likewise, results have been derived with fewer uncertainties than those obtained from standard hydraulic approaches, whose simplifying assumptions have not been considered. © 2011 by the American Geophysical Union. This work was funded by the Spanish Ministry of Science and Innovation within the framework of the CICYT Dendro-Avenidas project (CGL2007-62063) and the MAS Dendro-Avenidas project (CGL2010-19274). We are especially grateful to Robert D. Jarrett, Vern Manville, and one anonymous reviewer for their comments and helpful suggestions on previous versions of this manuscript. |
| Databáze: | OpenAIRE |
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