Investigation of the effects of uncertainties of inflow hydrograph and dam breach geometry on outflow hydrograph

2021-11
Gödek, Neslihan Pınar
Precise breach outflow hydrograph is crucial for the accurate determination of the flood damage and cost at the downstream region. Precise flood inundation modeling is based on the use of a realistic breach outflow hydrograph as an input. Therefore, comprehensive modeling is essential for an accurate description of breach hydrograph. This study evaluates the effects of dam breach parameters and inflow hydrograph on the peak breach outflow utilizing a probabilistic dam breach model. An experimental model was scaled through Froude similarity, and the deterministic model was developed through HEC-RAS (5.0.7). Dam breach parameters and inflow hydrograph were characterized with probability density functions in accordance with related literature. Probabilistic analyses were conducted using Monte Carlo Simulation through McBreach (5.0.7). Exceedance probability curves and peak flow distribution histograms were obtained for the peak breach outflows, and statistical distributions most widely used in water resources engineering were fitted. The goodness of fit was tested for examination of their suitability. The study showed that the uncertainty of the final breach bottom elevation does not significantly affect the peak breach outflow. The inflow hydrograph characterized with normal Probability Density Function (PDF) covers a broader range of peak breach outflows. The probabilistic peak breach outflow can be characterized with the common extreme type distributions.

Suggestions

Seismic Performance Evaluation of Concrete Gravity Dams by Using Pseudo Dynamic Testing and Simulations
Aldemir, Alper; Binici, Barış (null; 2017-11-24)
Dams are one of the mostimportantinfrastructure components servingfor water storage and energyproduction.Experimental studies on the seismic response of concrete gravity dams are scarce due to the complications regarding thelargescaleof dams and their interaction with the reservoir. This study presents the results of recent novel pseudo-dynamic dam tests (PSD) along with the nonlinear finite element simulations of the specimens. The test specimens were 1/75 scaled version of the highest ...
Evaluating the use of bias-corrected radar rainfall data in three flood events in Samsun, Turkey
Ozkaya, Arzu; Akyürek, Sevda Zuhal (Springer Science and Business Media LLC, 2019-09-01)
In applied hydrology, estimating the peak flood discharge in ungauged or poorly gauged river sections is vital for urbanized areas. Spatially distributed rainfall data such as weather radar data may be a good choice to represent the driving force in hydrologic models for ungauged regions. However, it is important to examine the accuracy of this product, especially over mountainous regions. The bias between radar rainfall and rain gauge rainfall can be progressively removed by using information provided by r...
Predicting Frictional Pressure Loss During Horizontal Drilling for Non-Newtonian Fluids
SORGUN, MEHMET; Ozbayoglu, M. E. (Informa UK Limited, 2011-01-01)
Accurate estimation of the frictional pressure losses for non-Newtonian drilling fluids inside annulus is quite important to determine pump rates and select mud pump systems during drilling operations. The purpose of this study is to estimate frictional pressure loss and velocity profile of non-Newtonian drilling fluids in both concentric and eccentric annuli using an Eulerian-Eulerian computational fluid dynamics (CFD) model. An extensive experimental program was performed in METU-PETE Flow Loop using two ...
Evaluation of the Ground Motion Scaling Procedures for Concrete Gravity Dams
SOYSAL, BERAT FEYZA; Ay, Bekir Özer; Arıcı, Yalın (Elsevier BV; 2017-09-13)
The seismic safety of dam structures is often evaluated using time history analyses conducted with a limited number of ground motions. The selection and scaling of the ground motions is usually the most effective factor determining the results of the safety assessment. The inherent variability in the ground motion as well as the difficulty of conducting the analyses for a large number of ground motions renders the selection as the most important factor in the analysis results. The guidelines for the nonline...
Parameter study on tracer flow test
Aydın, Hakkı; Akın, Serhat (2019-02-13)
Periodic measurement of flow rate in production wells is essential to monitor performance of geothermal wells and reservoir. Tracerdilution method has been introduced as a reliable, cheap and environment friendly technique to measure mass flow rate and enthalpy intwo phase geothermal systems. In this study, Sodium Fluorescein is used to measure liquid phase mass flow rate in a two phase productionline and in a single phase liquid injection line. The study includes the effect of flow regime and flowrate on t...
Citation Formats
N. P. Gödek, “Investigation of the effects of uncertainties of inflow hydrograph and dam breach geometry on outflow hydrograph,” M.S. - Master of Science, Middle East Technical University, 2021.