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Hydrodynamic modeling of dam - reservoir response during earthquakes / Ismail Aydin in Journal of engineering mechanics, Vol. 138 N° 2 (Fevrier 2012)

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 2 (Fevrier 2012) . - pp.164-174 Titre : Hydrodynamic modeling of dam - reservoir response during earthquakes Type de document : texte imprimé Auteurs : Ismail Aydin, Auteur ; Ender Demirel, Auteur Année de publication : 2012 Article en page(s) : pp.164-174 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Wave  runup  Hydrodynamic  pressure  Earthquakes  Dam  safety  Free  surfaces  Reservoirs. Résumé : A computational model is developed to analyze the hydrodynamic behavior of dam reservoirs during earthquakes. The mathematical model is based on the solution of two-dimensional (2D) Navier-Stokes equations in a vertical, semi-infinite domain truncated by a far-end boundary condition. A depth integrated continuity equation is used to track the deforming free-surface and ensure global mass conservation. A combination of Sommerfeld nonreflecting boundary and dissipation zone methods is implemented at the far end of the reservoir to prevent any back-reflections of pressure and free-surface waves. Nondimensionalized equations are used to compare contributions of each type of force to the development of the hydrodynamic pressure field and to the maximum run-up of free-surface waves on the dam face. Sinusoidal ground accelerations are applied to an idealized dam-reservoir system to analyze the system response. It is observed that the acoustic wave equation solution gives satisfactory results for the pressure field unless the contributions from the free-surface waves become significant at low reservoir depths. The surface wave run-up on the dam face is found to depend on the ground velocity, oscillation period, and the water depth. On the basis of numerical experiments, an expression for the wave run-up to predict conditions of overtopping from probable earthquake characteristics is proposed. Note de contenu : Article Outline 1. Introduction 2. Governing Equations and Nondimensionalization 3. Numerical Solution 4. Boundary Conditions 5. Solution Domain and Input Parameters for the Test Cases 6. Computational Grid 7. Temporal and Spatial Distributions of Forces in the Governing Equations 8. Hydrodynamic Pressure 9. Wave Run-Up on the Dam Face 10. Nondimensionalization Revisited 11. Conclusions ISSN : 0733-9399 [article] Hydrodynamic modeling of dam - reservoir response during earthquakes [texte imprimé] / Ismail Aydin, Auteur ; Ender Demirel, Auteur . - 2012 . - pp.164-174. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 2 (Fevrier 2012) . - pp.164-174 Mots-clés : Wave  runup  Hydrodynamic  pressure  Earthquakes  Dam  safety  Free  surfaces  Reservoirs. Résumé : A computational model is developed to analyze the hydrodynamic behavior of dam reservoirs during earthquakes. The mathematical model is based on the solution of two-dimensional (2D) Navier-Stokes equations in a vertical, semi-infinite domain truncated by a far-end boundary condition. A depth integrated continuity equation is used to track the deforming free-surface and ensure global mass conservation. A combination of Sommerfeld nonreflecting boundary and dissipation zone methods is implemented at the far end of the reservoir to prevent any back-reflections of pressure and free-surface waves. Nondimensionalized equations are used to compare contributions of each type of force to the development of the hydrodynamic pressure field and to the maximum run-up of free-surface waves on the dam face. Sinusoidal ground accelerations are applied to an idealized dam-reservoir system to analyze the system response. It is observed that the acoustic wave equation solution gives satisfactory results for the pressure field unless the contributions from the free-surface waves become significant at low reservoir depths. The surface wave run-up on the dam face is found to depend on the ground velocity, oscillation period, and the water depth. On the basis of numerical experiments, an expression for the wave run-up to predict conditions of overtopping from probable earthquake characteristics is proposed. Note de contenu : Article Outline 1. Introduction 2. Governing Equations and Nondimensionalization 3. Numerical Solution 4. Boundary Conditions 5. Solution Domain and Input Parameters for the Test Cases 6. Computational Grid 7. Temporal and Spatial Distributions of Forces in the Governing Equations 8. Hydrodynamic Pressure 9. Wave Run-Up on the Dam Face 10. Nondimensionalization Revisited 11. Conclusions ISSN : 0733-9399