scholarly journals A probabilistic framework for comparison of dam breach parameters and outflow hydrograph generated by different empirical prediction methods

2016 ◽  
Vol 86 ◽  
pp. 248-263 ◽  
Author(s):  
Ebrahim Ahmadisharaf ◽  
Alfred J. Kalyanapu ◽  
Brantley A. Thames ◽  
Jason Lillywhite
Keyword(s):  
Prediction Methods ◽  
Probabilistic Framework ◽  
Dam Breach ◽  
Empirical Prediction ◽  
Breach Parameters ◽  
Outflow Hydrograph

scholarly journals Baur dam breach analysis using various manning’s roughness values

2020 ◽  
Vol 4 (6) ◽  
pp. 293-297
Author(s):  
Jyothi Prasad
Keyword(s):  
High Impact ◽  
Agricultural Area ◽  
Flood Mapping ◽  
Command Area ◽  
Dam Breach ◽  
Inundation Maps ◽  
Modelling Procedure ◽  
Breach Parameters ◽  
Analysis System

This paper describes the importance of flood mapping in terms of saving downstream agricultural area. Flood can cause high impact on the nearby crops productivity which further affects the country’s economy. The Baur dam has a Culturable Command Area of 31453,6572 hectares. It’s key focus is on describing the importance of Manning’s roughness value in dam breach modelling and shows it’s bad impact on downstream areas of dam. In this work hypothetical breach modelling of Baur dam is performed by using Hydrologic Engineer’s Centre- River Analysis System (HEC-RAS). Details about study area, breach parameters, modelling procedure, and outflow flood values are also described in this paper. Flow hydrographs are plotted at different Manning’s roughness value for the two populated downstream areas of dam and it has been observed from results that as roughness value increases flow decreases which justifies Manning’s theory. As a Final result Inundation maps are plotted with the detail of inundated area values for different Manning’s values so that the effect of roughness can be analysed numerically on study area. The Manning’s roughness value of 0.030 causes 37.75km2 inundated area in the downstream of dam.1

scholarly journals An evaluation of existent methods for estimation of embankment dam breach parameters

2017 ◽  
Vol 87 (1) ◽  
pp. 545-566 ◽  
Author(s):  
Saad Sh. Sammen ◽  
T. A. Mohamed ◽  
A. H. Ghazali ◽  
L. M. Sidek ◽  
A. El-Shafie
Keyword(s):  
Embankment Dam ◽  
Dam Breach ◽  
Breach Parameters

scholarly journals Sensitivity analysis for dam breach parameters using different approaches for earth-fill dam

2021 ◽  
Vol 14 (4) ◽  
pp. 90-97
Author(s):  
Israa Dheyaa Abdulrazzaq ◽  
Qassem H. Jalut ◽  
Jasim M. Abbas
Keyword(s):  
Sensitivity Analysis ◽  
Formation Time ◽  
Dam Breach ◽  
Side Slope ◽  
Operating Level ◽  
Dam Site ◽  
Breach Parameters ◽  
Overtopping Failure ◽  
Dam Breaking ◽  
Breach Width

The prediction of dams breach geometry crucial in studies of dam breaking. The hydrographs characteristics of flood that resulting from breaking of dam is mainly depend on the geometry of breach and the time formation of breach. Five approaches (Froehlich, Macdonald and Langridge-Monopolis, Von thun & Gillete, USBR and Singh % Snorrason) was used in order to predict dam breach parameters (breach width, breach side slope, breach formation time). The Sensitivity analysis was performed in order to assess the effect of each parameter on the resulting hydrograph of the flood. HEC-RAS model was used to calculate the effect of each parameter on the hydrograph of the flood that resulted. The width of breach (Bavg), side slope (z) and formation time of breach (tf) increased by 25%, 50%, 75% and 100% and decreased by 25%, 50% and 75%, respectively. Flood hydrograph was estimated at the dam site for each case. Sensitivity analysis was performed in order to check the effect of each parameter of breach and time of breaching. Sensitivity analysis was performed with Froehlich method with the mode of overtopping failure and maximum operating level at 107.5 meter above sea level. Result of sensitivity analysis show that peak discharge and time to reach it is adequately sensitive to breach side slope, highly sensitive to the breach formation time and less sensitive to breach width.

scholarly journals International activities in HF sky-wave field-strength estimation (period 1956-1991)

1998 ◽  
Vol 41 (5-6) ◽  
Author(s):  
P. A. Bradley
Keyword(s):  
World War Ii ◽  
Field Strength ◽  
Wave Field ◽  
Measurement Data ◽  
Service Planning ◽  
Prediction Methods ◽  
World War ◽  
Empirical Prediction ◽  
Radio Signals

Methods for the determination of the strengths of radio signals reflected from the ionosphere and propagated to distant locations are required for service planning and circuit operation. Efforts are described following World War II to arrive at agreed procedures and some of the features of the various empirical prediction methods that have been formulated over the years are discussed. The problems are highlighted of determining a "best" method from among those available. Measurement data collected for this purpose are reviewed and attention is drawn to their limitations of accuracy and coverage. Even comparison of predicted and measured values is not straightforward, and the techniques that have been developed to do this are considered.

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