Uncertainty based analysis of seepage through earth-fill dams

Download

index.pdf

Date

2014

Author

Çalamak, Melih

Metadata

Show full item record

Item Usage Stats

284
views

134
downloads

The steady-state and transient seepage through embankment dams are investigated considering the uncertainty of hydraulic conductivity and van Genuchten fitting parameters, α and n used for unsaturated flow modeling. A random number generation algorithm producing random values for these parameters is coupled with a finite element software, SEEP/W to analyze seepage through earth-fill dams. Monte Carlo simulation is adopted for stochastic seepage analyses. The variability effects of the random parameters on seepage are investigated conducting sensitivity analyses. The variation effects of hydraulic conductivity are found to be significant, whereas those of fitting parameters are shown to be negligible or minor. Considering these, the statistical and probabilistic properties of the seepage are assessed for different embankment dam types and boundary conditions. The degree of uncertainty and statistical randomness of the seepage are evaluated. In general, it is found that the seepage through embankment dams can be characterized by generalized extreme value or three-parameter log-normal distributions.

Subject Keywords

Seepage., Earth dams., Embankments., Hydraulic structures., Monte Carlo method.

URI

http://etd.lib.metu.edu.tr/upload/12618341/index.pdf
https://hdl.handle.net/11511/24317

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Sensitivity Analysis of Major Drilling Parameters on Cuttings Transport during Drilling Highly-inclined Wells Ozbayoglu, E. M.; Miska, S. Z.; Takach, N.; Reed, T. (Informa UK Limited, 2009-01-01) In this study, a layered cuttings transport model is developed for high-angle and horizontal wells, which can be used for incompressible non-Newtonian fluids as well as compressible non-Newtonian fluids (i.e., foams). The effects of major drilling parameters, such as flow rate, rate of penetration, fluid density, viscosity, gas ratio, cuttings size, cuttings density, wellbore inclination and eccentricity of the drillsting on cuttings transport efficiency are analyzed. The major findings from this study are,...
Computational modelling of free surface flow in intake structures using flow 3D software Aybar, Akın; Aydın, İsmail; Department of Civil Engineering (2012) Intakes are inlet structures where fluid is accelerated to a certain flow velocity to provide required amount of water into a hydraulic system. Intake size and geometry affects the formation of flow patterns, which can be influential for hydraulic performance of the whole system. An experimental study is conducted by measuring velocity field in the hydraulic model of the head pond of a hydropower plant to investigate vortex formation. Vortex strength based on potential flow theory is calculated from the mea...
Genetic algorithm for estimating multiphase flow functions from unsteady-state displacement experiments Akın, Serhat (1998-04-30) Relative permeability and capillary pressure are the primary flow parameters required to model multiphase flow in porous media. Frequently, these properties are estimated on the basis of unsteady state laboratory displacement experiments. Interpretation of the flood process to obtain relative permeability data is performed by one of two means: application of frontal advance theory or direct computer simulation. Application of frontal advance theory requires a number of experimental restrictions such that th...
Numerical Aspects of POD-Based Reduced-Order Modeling forDarcy-Brinkman Equations Güler Eroğlu, Fatma; Kaya Merdan, Songül (2018-10-21) We propose, analyze and test a reduced order modelling with proper orthogonal decomposition (POD) method for the modeling to flows governed by double diffusive convection, which models flow driven by two potentials with different rates of diffusion. We present a theoretical analysis of the method and give results for various numerical tests on benchmark problems that will demonstrate both the theory and the effectiveness of the proposed method.
Uncertainty quantification of transient unsaturated seepage through embankment dams Çalamak, Melih; Yanmaz, Ali Melih (American Society of Civil Engineers (ASCE), 2017-06-01) Sensitivity analysis is conducted to investigate the effects of uncertainty in hydraulic conductivity and van Genuchten parameters on transient seepage. To this end, a random number generator is used to generate random values from probability distributions of each parameter. The generator is coupled with finite-element software that handles seepage analysis in porous media. The Monte Carlo simulation approach is adopted for stochastic seepage analyses. The suggested method is applied on a homogeneous dam ma...

Citation Formats

M. Çalamak, “Uncertainty based analysis of seepage through earth-fill dams,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.